Merge pull request #582 from jskeet/csharp-json

JSON formatting in C#

18 files changed, 1486 insertions, 162 deletions

diff --git a/csharp/src/AddressBook/Addressbook.cs b/csharp/src/AddressBook/Addressbook.cs
index 5f4a5139..afdb1728 100644
--- a/csharp/src/AddressBook/Addressbook.cs
+++ b/csharp/src/AddressBook/Addressbook.cs
@@ -40,13 +40,13 @@ namespace Google.Protobuf.Examples.AddressBook {
           });
       internal__static_tutorial_Person__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.Examples.AddressBook.Person), descriptor.MessageTypes[0],
-              new string[] { "Name", "Id", "Email", "Phone", });
+              new string[] { "Name", "Id", "Email", "Phone", }, new string[] { });
       internal__static_tutorial_Person_PhoneNumber__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber), descriptor.MessageTypes[0].NestedTypes[0],
-              new string[] { "Number", "Type", });
+              new string[] { "Number", "Type", }, new string[] { });
       internal__static_tutorial_AddressBook__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.Examples.AddressBook.AddressBook), descriptor.MessageTypes[1],
-              new string[] { "Person", });
+              new string[] { "Person", }, new string[] { });
     }
     #endregion
 
@@ -160,6 +160,10 @@ namespace Google.Protobuf.Examples.AddressBook {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -330,6 +334,10 @@ namespace Google.Protobuf.Examples.AddressBook {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Number.Length != 0) {
             output.WriteRawTag(10);
@@ -463,6 +471,10 @@ namespace Google.Protobuf.Examples.AddressBook {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       person_.WriteTo(output, _repeated_person_codec);
     }
diff --git a/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs b/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs
index 8cee9820..28c2195f 100644
--- a/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs
@@ -734,5 +734,25 @@ namespace Google.Protobuf
             var message = SampleMessages.CreateFullTestAllTypes();

             Assert.Throws<InvalidCastException>(() => message.Fields[TestAllTypes.SingleBoolFieldNumber].GetValue(new TestMap()));

         }

+

+        [Test]

+        public void Reflection_Oneof()

+        {

+            var message = new TestAllTypes();

+            var fields = message.Fields;

+            Assert.AreEqual(1, fields.Oneofs.Count);

+            var oneof = fields.Oneofs[0];

+            Assert.AreEqual("oneof_field", oneof.Descriptor.Name);

+            Assert.IsNull(oneof.GetCaseFieldDescriptor(message));

+

+            message.OneofString = "foo";

+            Assert.AreSame(fields[TestAllTypes.OneofStringFieldNumber].Descriptor, oneof.GetCaseFieldDescriptor(message));

+

+            message.OneofUint32 = 10;

+            Assert.AreSame(fields[TestAllTypes.OneofUint32FieldNumber].Descriptor, oneof.GetCaseFieldDescriptor(message));

+

+            oneof.Clear(message);

+            Assert.AreEqual(TestAllTypes.OneofFieldOneofCase.None, message.OneofFieldCase);

+        }

     }

 }

diff --git a/csharp/src/ProtocolBuffers.Test/JsonFormatterTest.cs b/csharp/src/ProtocolBuffers.Test/JsonFormatterTest.cs
new file mode 100644
index 00000000..5441bf47
--- /dev/null
+++ b/csharp/src/ProtocolBuffers.Test/JsonFormatterTest.cs
@@ -0,0 +1,261 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Google.Protobuf.TestProtos;
+using NUnit.Framework;
+
+namespace Google.Protobuf
+{
+    public class JsonFormatterTest
+    {
+        [Test]
+        public void DefaultValues_WhenOmitted()
+        {
+            var formatter = new JsonFormatter(new JsonFormatter.Settings(formatDefaultValues: false));
+
+            Assert.AreEqual("{ }", formatter.Format(new ForeignMessage()));
+            Assert.AreEqual("{ }", formatter.Format(new TestAllTypes()));
+            Assert.AreEqual("{ }", formatter.Format(new TestMap()));
+        }
+
+        [Test]
+        public void DefaultValues_WhenIncluded()
+        {
+            var formatter = new JsonFormatter(new JsonFormatter.Settings(formatDefaultValues: true));
+            Assert.AreEqual("{ \"c\": 0 }", formatter.Format(new ForeignMessage()));
+        }
+
+        [Test]
+        public void AllSingleFields()
+        {
+            var message = new TestAllTypes
+            {
+                SingleBool = true,
+                SingleBytes = ByteString.CopyFrom(1, 2, 3, 4),
+                SingleDouble = 23.5,
+                SingleFixed32 = 23,
+                SingleFixed64 = 1234567890123,
+                SingleFloat = 12.25f,
+                SingleForeignEnum = ForeignEnum.FOREIGN_BAR,
+                SingleForeignMessage = new ForeignMessage { C = 10 },
+                SingleImportEnum = ImportEnum.IMPORT_BAZ,
+                SingleImportMessage = new ImportMessage { D = 20 },
+                SingleInt32 = 100,
+                SingleInt64 = 3210987654321,
+                SingleNestedEnum = TestAllTypes.Types.NestedEnum.FOO,
+                SingleNestedMessage = new TestAllTypes.Types.NestedMessage { Bb = 35 },
+                SinglePublicImportMessage = new PublicImportMessage { E = 54 },
+                SingleSfixed32 = -123,
+                SingleSfixed64 = -12345678901234,
+                SingleSint32 = -456,
+                SingleSint64 = -12345678901235,
+                SingleString = "test\twith\ttabs",
+                SingleUint32 = uint.MaxValue,
+                SingleUint64 = ulong.MaxValue,
+            };
+            var actualText = JsonFormatter.Default.Format(message);
+
+            // Fields in declaration order, which matches numeric order.
+            var expectedText = "{ " +
+                "\"singleInt32\": 100, " +
+                "\"singleInt64\": \"3210987654321\", " +
+                "\"singleUint32\": 4294967295, " +
+                "\"singleUint64\": \"18446744073709551615\", " +
+                "\"singleSint32\": -456, " +
+                "\"singleSint64\": \"-12345678901235\", " +
+                "\"singleFixed32\": 23, " +
+                "\"singleFixed64\": \"1234567890123\", " +
+                "\"singleSfixed32\": -123, " +
+                "\"singleSfixed64\": \"-12345678901234\", " +
+                "\"singleFloat\": 12.25, " +
+                "\"singleDouble\": 23.5, " +
+                "\"singleBool\": true, " +
+                "\"singleString\": \"test\\twith\\ttabs\", " +
+                "\"singleBytes\": \"AQIDBA==\", " +
+                "\"singleNestedMessage\": { \"bb\": 35 }, " +
+                "\"singleForeignMessage\": { \"c\": 10 }, " +
+                "\"singleImportMessage\": { \"d\": 20 }, " +
+                "\"singleNestedEnum\": \"FOO\", " +
+                "\"singleForeignEnum\": \"FOREIGN_BAR\", " +
+                "\"singleImportEnum\": \"IMPORT_BAZ\", " +
+                "\"singlePublicImportMessage\": { \"e\": 54 }" +
+                " }";
+            Assert.AreEqual(expectedText, actualText);
+        }
+
+        [Test]
+        public void RepeatedField()
+        {
+            Assert.AreEqual("{ \"repeatedInt32\": [ 1, 2, 3, 4, 5 ] }",
+                JsonFormatter.Default.Format(new TestAllTypes { RepeatedInt32 = { 1, 2, 3, 4, 5 } }));
+        }
+
+        [Test]
+        public void MapField_StringString()
+        {
+            Assert.AreEqual("{ \"mapStringString\": { \"with spaces\": \"bar\", \"a\": \"b\" } }",
+                JsonFormatter.Default.Format(new TestMap { MapStringString = { { "with spaces", "bar" }, { "a", "b" } } }));
+        }
+
+        [Test]
+        public void MapField_Int32Int32()
+        {
+            // The keys are quoted, but the values aren't.
+            Assert.AreEqual("{ \"mapInt32Int32\": { \"0\": 1, \"2\": 3 } }",
+                JsonFormatter.Default.Format(new TestMap { MapInt32Int32 = { { 0, 1 }, { 2, 3 } } }));
+        }
+
+        [Test]
+        public void MapField_BoolBool()
+        {
+            // The keys are quoted, but the values aren't.
+            Assert.AreEqual("{ \"mapBoolBool\": { \"false\": true, \"true\": false } }",
+                JsonFormatter.Default.Format(new TestMap { MapBoolBool = { { false, true }, { true, false } } }));
+        }
+
+        [TestCase(1.0, "1")]
+        [TestCase(double.NaN, "\"NaN\"")]
+        [TestCase(double.PositiveInfinity, "\"Infinity\"")]
+        [TestCase(double.NegativeInfinity, "\"-Infinity\"")]
+        public void DoubleRepresentations(double value, string expectedValueText)
+        {
+            var message = new TestAllTypes { SingleDouble = value };
+            string actualText = JsonFormatter.Default.Format(message);
+            string expectedText = "{ \"singleDouble\": " + expectedValueText + " }";
+            Assert.AreEqual(expectedText, actualText);
+        }
+
+        [Test]
+        public void UnknownEnumValueOmitted_SingleField()
+        {
+            var message = new TestAllTypes { SingleForeignEnum = (ForeignEnum) 100 };
+            Assert.AreEqual("{ }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        public void UnknownEnumValueOmitted_RepeatedField()
+        {
+            var message = new TestAllTypes { RepeatedForeignEnum = { ForeignEnum.FOREIGN_BAZ, (ForeignEnum) 100, ForeignEnum.FOREIGN_FOO } };
+            Assert.AreEqual("{ \"repeatedForeignEnum\": [ \"FOREIGN_BAZ\", \"FOREIGN_FOO\" ] }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        public void UnknownEnumValueOmitted_MapField()
+        {
+            // This matches the C++ behaviour.
+            var message = new TestMap { MapInt32Enum = { { 1, MapEnum.MAP_ENUM_FOO }, { 2, (MapEnum) 100 }, { 3, MapEnum.MAP_ENUM_BAR } } };
+            Assert.AreEqual("{ \"mapInt32Enum\": { \"1\": \"MAP_ENUM_FOO\", \"3\": \"MAP_ENUM_BAR\" } }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        public void UnknownEnumValueOmitted_RepeatedField_AllEntriesUnknown()
+        {
+            // *Maybe* we should hold off on writing the "[" until we find that we've got at least one value to write...
+            // but this is what happens at the moment, and it doesn't seem too awful.
+            var message = new TestAllTypes { RepeatedForeignEnum = { (ForeignEnum) 200, (ForeignEnum) 100 } };
+            Assert.AreEqual("{ \"repeatedForeignEnum\": [ ] }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        public void NullValueForMessage()
+        {
+            var message = new TestMap { MapInt32ForeignMessage = { { 10, null } } };
+            Assert.AreEqual("{ \"mapInt32ForeignMessage\": { \"10\": null } }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        [TestCase("a\u17b4b", "a\\u17b4b")] // Explicit
+        [TestCase("a\u0601b", "a\\u0601b")] // Ranged
+        [TestCase("a\u0605b", "a\u0605b")] // Passthrough (note lack of double backslash...)
+        public void SimpleNonAscii(string text, string encoded)
+        {
+            var message = new TestAllTypes { SingleString = text };
+            Assert.AreEqual("{ \"singleString\": \"" + encoded + "\" }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        public void SurrogatePairEscaping()
+        {
+            var message = new TestAllTypes { SingleString = "a\uD801\uDC01b" };
+            Assert.AreEqual("{ \"singleString\": \"a\\ud801\\udc01b\" }", JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        public void InvalidSurrogatePairsFail()
+        {
+            // Note: don't use TestCase for these, as the strings can't be reliably represented 
+            // See http://codeblog.jonskeet.uk/2014/11/07/when-is-a-string-not-a-string/
+
+            // Lone low surrogate
+            var message = new TestAllTypes { SingleString = "a\uDC01b" };
+            Assert.Throws<ArgumentException>(() => JsonFormatter.Default.Format(message));
+
+            // Lone high surrogate
+            message = new TestAllTypes { SingleString = "a\uD801b" };
+            Assert.Throws<ArgumentException>(() => JsonFormatter.Default.Format(message));
+        }
+
+        [Test]
+        [TestCase("foo_bar", "fooBar")]
+        [TestCase("bananaBanana", "bananaBanana")]
+        [TestCase("BANANABanana", "bananaBanana")]
+        public void ToCamelCase(string original, string expected)
+        {
+            Assert.AreEqual(expected, JsonFormatter.ToCamelCase(original));
+        }
+
+        [Test]
+        [TestCase(null, "{ }")]
+        [TestCase("x", "{ \"fooString\": \"x\" }")]
+        [TestCase("", "{ \"fooString\": \"\" }")]
+        [TestCase(null, "{ }")]
+        public void Oneof(string fooStringValue, string expectedJson)
+        {
+            var message = new TestOneof();
+            if (fooStringValue != null)
+            {
+                message.FooString = fooStringValue;
+            }
+
+            // We should get the same result both with and without "format default values".
+            var formatter = new JsonFormatter(new JsonFormatter.Settings(false));
+            Assert.AreEqual(expectedJson, formatter.Format(message));
+            formatter = new JsonFormatter(new JsonFormatter.Settings(true));
+            Assert.AreEqual(expectedJson, formatter.Format(message));
+        }
+    }
+}
diff --git a/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj b/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
index b02abe70..269961c7 100644
--- a/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
+++ b/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
@@ -80,6 +80,7 @@
     <Compile Include="GeneratedMessageTest.cs" />

     <Compile Include="Collections\MapFieldTest.cs" />

     <Compile Include="Collections\RepeatedFieldTest.cs" />

+    <Compile Include="JsonFormatterTest.cs" />

     <Compile Include="SampleEnum.cs" />

     <Compile Include="SampleMessages.cs" />

     <Compile Include="TestProtos\MapUnittestProto3.cs" />

diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/MapUnittestProto3.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/MapUnittestProto3.cs
index 55434c53..05fe7fc4 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/MapUnittestProto3.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/MapUnittestProto3.cs
@@ -197,136 +197,136 @@ namespace Google.Protobuf.TestProtos {
           });
       internal__static_protobuf_unittest_TestMap__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap), descriptor.MessageTypes[0],
-              new string[] { "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapStringString", "MapInt32Bytes", "MapInt32Enum", "MapInt32ForeignMessage", });
+              new string[] { "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapStringString", "MapInt32Bytes", "MapInt32Enum", "MapInt32ForeignMessage", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt32Int32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt32Int32Entry), descriptor.MessageTypes[0].NestedTypes[0],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt64Int64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt64Int64Entry), descriptor.MessageTypes[0].NestedTypes[1],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapUint32Uint32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapUint32Uint32Entry), descriptor.MessageTypes[0].NestedTypes[2],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapUint64Uint64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapUint64Uint64Entry), descriptor.MessageTypes[0].NestedTypes[3],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapSint32Sint32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapSint32Sint32Entry), descriptor.MessageTypes[0].NestedTypes[4],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapSint64Sint64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapSint64Sint64Entry), descriptor.MessageTypes[0].NestedTypes[5],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapFixed32Fixed32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapFixed32Fixed32Entry), descriptor.MessageTypes[0].NestedTypes[6],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapFixed64Fixed64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapFixed64Fixed64Entry), descriptor.MessageTypes[0].NestedTypes[7],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapSfixed32Sfixed32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapSfixed32Sfixed32Entry), descriptor.MessageTypes[0].NestedTypes[8],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapSfixed64Sfixed64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapSfixed64Sfixed64Entry), descriptor.MessageTypes[0].NestedTypes[9],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt32FloatEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt32FloatEntry), descriptor.MessageTypes[0].NestedTypes[10],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt32DoubleEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt32DoubleEntry), descriptor.MessageTypes[0].NestedTypes[11],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapBoolBoolEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapBoolBoolEntry), descriptor.MessageTypes[0].NestedTypes[12],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapStringStringEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapStringStringEntry), descriptor.MessageTypes[0].NestedTypes[13],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt32BytesEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt32BytesEntry), descriptor.MessageTypes[0].NestedTypes[14],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt32EnumEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt32EnumEntry), descriptor.MessageTypes[0].NestedTypes[15],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMap_MapInt32ForeignMessageEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap.Types.MapInt32ForeignMessageEntry), descriptor.MessageTypes[0].NestedTypes[16],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestMapSubmessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMapSubmessage), descriptor.MessageTypes[1],
-              new string[] { "TestMap", });
+              new string[] { "TestMap", }, new string[] { });
       internal__static_protobuf_unittest_TestMessageMap__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMessageMap), descriptor.MessageTypes[2],
-              new string[] { "MapInt32Message", });
+              new string[] { "MapInt32Message", }, new string[] { });
       internal__static_protobuf_unittest_TestMessageMap_MapInt32MessageEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMessageMap.Types.MapInt32MessageEntry), descriptor.MessageTypes[2].NestedTypes[0],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestSameTypeMap__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestSameTypeMap), descriptor.MessageTypes[3],
-              new string[] { "Map1", "Map2", });
+              new string[] { "Map1", "Map2", }, new string[] { });
       internal__static_protobuf_unittest_TestSameTypeMap_Map1Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestSameTypeMap.Types.Map1Entry), descriptor.MessageTypes[3].NestedTypes[0],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestSameTypeMap_Map2Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestSameTypeMap.Types.Map2Entry), descriptor.MessageTypes[3].NestedTypes[1],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap), descriptor.MessageTypes[4],
-              new string[] { "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapInt32Enum", "MapInt32ForeignMessage", });
+              new string[] { "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapInt32Enum", "MapInt32ForeignMessage", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapInt32Int32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapInt32Int32Entry), descriptor.MessageTypes[4].NestedTypes[0],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapInt64Int64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapInt64Int64Entry), descriptor.MessageTypes[4].NestedTypes[1],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapUint32Uint32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapUint32Uint32Entry), descriptor.MessageTypes[4].NestedTypes[2],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapUint64Uint64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapUint64Uint64Entry), descriptor.MessageTypes[4].NestedTypes[3],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapSint32Sint32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapSint32Sint32Entry), descriptor.MessageTypes[4].NestedTypes[4],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapSint64Sint64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapSint64Sint64Entry), descriptor.MessageTypes[4].NestedTypes[5],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapFixed32Fixed32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapFixed32Fixed32Entry), descriptor.MessageTypes[4].NestedTypes[6],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapFixed64Fixed64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapFixed64Fixed64Entry), descriptor.MessageTypes[4].NestedTypes[7],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapSfixed32Sfixed32Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapSfixed32Sfixed32Entry), descriptor.MessageTypes[4].NestedTypes[8],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapSfixed64Sfixed64Entry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapSfixed64Sfixed64Entry), descriptor.MessageTypes[4].NestedTypes[9],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapInt32FloatEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapInt32FloatEntry), descriptor.MessageTypes[4].NestedTypes[10],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapInt32DoubleEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapInt32DoubleEntry), descriptor.MessageTypes[4].NestedTypes[11],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapBoolBoolEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapBoolBoolEntry), descriptor.MessageTypes[4].NestedTypes[12],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapInt32EnumEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapInt32EnumEntry), descriptor.MessageTypes[4].NestedTypes[13],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_TestArenaMap_MapInt32ForeignMessageEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap.Types.MapInt32ForeignMessageEntry), descriptor.MessageTypes[4].NestedTypes[14],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_MessageContainingEnumCalledType__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType), descriptor.MessageTypes[5],
-              new string[] { "Type", });
+              new string[] { "Type", }, new string[] { });
       internal__static_protobuf_unittest_MessageContainingEnumCalledType_TypeEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType.Types.TypeEntry), descriptor.MessageTypes[5].NestedTypes[0],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
       internal__static_protobuf_unittest_MessageContainingMapCalledEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MessageContainingMapCalledEntry), descriptor.MessageTypes[6],
-              new string[] { "Entry", });
+              new string[] { "Entry", }, new string[] { });
       internal__static_protobuf_unittest_MessageContainingMapCalledEntry_EntryEntry__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MessageContainingMapCalledEntry.Types.EntryEntry), descriptor.MessageTypes[6].NestedTypes[0],
-              new string[] { "Key", "Value", });
+              new string[] { "Key", "Value", }, new string[] { });
     }
     #endregion
 
@@ -602,6 +602,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       mapInt32Int32_.WriteTo(output, _map_mapInt32Int32_codec);
       mapInt64Int64_.WriteTo(output, _map_mapInt64Int64_codec);
@@ -836,6 +840,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -978,6 +986,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0L) {
             output.WriteRawTag(8);
@@ -1120,6 +1132,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -1262,6 +1278,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0UL) {
             output.WriteRawTag(8);
@@ -1404,6 +1424,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -1546,6 +1570,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0L) {
             output.WriteRawTag(8);
@@ -1688,6 +1716,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(13);
@@ -1830,6 +1862,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0UL) {
             output.WriteRawTag(9);
@@ -1972,6 +2008,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(13);
@@ -2114,6 +2154,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0L) {
             output.WriteRawTag(9);
@@ -2256,6 +2300,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -2398,6 +2446,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -2540,6 +2592,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != false) {
             output.WriteRawTag(8);
@@ -2682,6 +2738,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key.Length != 0) {
             output.WriteRawTag(10);
@@ -2824,6 +2884,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -2966,6 +3030,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -3109,6 +3177,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -3250,6 +3322,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (testMap_ != null) {
         output.WriteRawTag(10);
@@ -3370,6 +3446,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       mapInt32Message_.WriteTo(output, _map_mapInt32Message_codec);
     }
@@ -3493,6 +3573,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -3644,6 +3728,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       map1_.WriteTo(output, _map_map1_codec);
       map2_.WriteTo(output, _map_map2_codec);
@@ -3773,6 +3861,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -3915,6 +4007,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -4216,6 +4312,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       mapInt32Int32_.WriteTo(output, _map_mapInt32Int32_codec);
       mapInt64Int64_.WriteTo(output, _map_mapInt64Int64_codec);
@@ -4436,6 +4536,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -4578,6 +4682,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0L) {
             output.WriteRawTag(8);
@@ -4720,6 +4828,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -4862,6 +4974,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0UL) {
             output.WriteRawTag(8);
@@ -5004,6 +5120,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -5146,6 +5266,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0L) {
             output.WriteRawTag(8);
@@ -5288,6 +5412,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(13);
@@ -5430,6 +5558,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0UL) {
             output.WriteRawTag(9);
@@ -5572,6 +5704,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(13);
@@ -5714,6 +5850,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0L) {
             output.WriteRawTag(9);
@@ -5856,6 +5996,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -5998,6 +6142,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -6140,6 +6288,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != false) {
             output.WriteRawTag(8);
@@ -6282,6 +6434,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -6425,6 +6581,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -6564,6 +6724,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       type_.WriteTo(output, _map_type_codec);
     }
@@ -6691,6 +6855,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
@@ -6830,6 +6998,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       entry_.WriteTo(output, _map_entry_codec);
     }
@@ -6952,6 +7124,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Key != 0) {
             output.WriteRawTag(8);
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportProto3.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportProto3.cs
index d30f22db..3cc5949b 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportProto3.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportProto3.cs
@@ -38,7 +38,7 @@ namespace Google.Protobuf.TestProtos {
           });
       internal__static_protobuf_unittest_import_ImportMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.ImportMessage), descriptor.MessageTypes[0],
-              new string[] { "D", });
+              new string[] { "D", }, new string[] { });
     }
     #endregion
 
@@ -124,6 +124,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (D != 0) {
         output.WriteRawTag(8);
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportPublicProto3.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportPublicProto3.cs
index 5aa03a64..d3abe5d5 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportPublicProto3.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestImportPublicProto3.cs
@@ -33,7 +33,7 @@ namespace Google.Protobuf.TestProtos {
           });
       internal__static_protobuf_unittest_import_PublicImportMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.PublicImportMessage), descriptor.MessageTypes[0],
-              new string[] { "E", });
+              new string[] { "E", }, new string[] { });
     }
     #endregion
 
@@ -109,6 +109,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (E != 0) {
         output.WriteRawTag(8);
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestIssues.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestIssues.cs
index 0e409c8b..c296cd24 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestIssues.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestIssues.cs
@@ -53,25 +53,25 @@ namespace UnitTest.Issues.TestProtos {
           });
       internal__static_unittest_issues_Issue307__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.Issue307), descriptor.MessageTypes[0],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_unittest_issues_Issue307_NestedOnce__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce), descriptor.MessageTypes[0].NestedTypes[0],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_unittest_issues_Issue307_NestedOnce_NestedTwice__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce.Types.NestedTwice), descriptor.MessageTypes[0].NestedTypes[0].NestedTypes[0],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_unittest_issues_NegativeEnumMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.NegativeEnumMessage), descriptor.MessageTypes[1],
-              new string[] { "Value", "Values", "PackedValues", });
+              new string[] { "Value", "Values", "PackedValues", }, new string[] { });
       internal__static_unittest_issues_DeprecatedChild__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.DeprecatedChild), descriptor.MessageTypes[2],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_unittest_issues_DeprecatedFieldsMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.DeprecatedFieldsMessage), descriptor.MessageTypes[3],
-              new string[] { "PrimitiveValue", "PrimitiveArray", "MessageValue", "MessageArray", "EnumValue", "EnumArray", });
+              new string[] { "PrimitiveValue", "PrimitiveArray", "MessageValue", "MessageArray", "EnumValue", "EnumArray", }, new string[] { });
       internal__static_unittest_issues_ItemField__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.ItemField), descriptor.MessageTypes[4],
-              new string[] { "Item", });
+              new string[] { "Item", }, new string[] { });
     }
     #endregion
 
@@ -148,6 +148,10 @@ namespace UnitTest.Issues.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -237,6 +241,10 @@ namespace UnitTest.Issues.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
         }
 
@@ -326,6 +334,10 @@ namespace UnitTest.Issues.TestProtos {
               return hash;
             }
 
+            public override string ToString() {
+              return pb::JsonFormatter.Default.Format(this);
+            }
+
             public void WriteTo(pb::CodedOutputStream output) {
             }
 
@@ -459,6 +471,10 @@ namespace UnitTest.Issues.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Value != global::UnitTest.Issues.TestProtos.NegativeEnum.NEGATIVE_ENUM_ZERO) {
         output.WriteRawTag(8);
@@ -577,6 +593,10 @@ namespace UnitTest.Issues.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -746,6 +766,10 @@ namespace UnitTest.Issues.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (PrimitiveValue != 0) {
         output.WriteRawTag(8);
@@ -918,6 +942,10 @@ namespace UnitTest.Issues.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Item != 0) {
         output.WriteRawTag(8);
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestProto3.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestProto3.cs
index d2437bf4..a5e37bd6 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestProto3.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestProto3.cs
@@ -191,109 +191,109 @@ namespace Google.Protobuf.TestProtos {
           });
       internal__static_protobuf_unittest_TestAllTypes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestAllTypes), descriptor.MessageTypes[0],
-              new string[] { "SingleInt32", "SingleInt64", "SingleUint32", "SingleUint64", "SingleSint32", "SingleSint64", "SingleFixed32", "SingleFixed64", "SingleSfixed32", "SingleSfixed64", "SingleFloat", "SingleDouble", "SingleBool", "SingleString", "SingleBytes", "SingleNestedMessage", "SingleForeignMessage", "SingleImportMessage", "SingleNestedEnum", "SingleForeignEnum", "SingleImportEnum", "SinglePublicImportMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedPublicImportMessage", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", "OneofField", });
+              new string[] { "SingleInt32", "SingleInt64", "SingleUint32", "SingleUint64", "SingleSint32", "SingleSint64", "SingleFixed32", "SingleFixed64", "SingleSfixed32", "SingleSfixed64", "SingleFloat", "SingleDouble", "SingleBool", "SingleString", "SingleBytes", "SingleNestedMessage", "SingleForeignMessage", "SingleImportMessage", "SingleNestedEnum", "SingleForeignEnum", "SingleImportEnum", "SinglePublicImportMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedPublicImportMessage", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", }, new string[] { "OneofField", });
       internal__static_protobuf_unittest_TestAllTypes_NestedMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage), descriptor.MessageTypes[0].NestedTypes[0],
-              new string[] { "Bb", });
+              new string[] { "Bb", }, new string[] { });
       internal__static_protobuf_unittest_NestedTestAllTypes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.NestedTestAllTypes), descriptor.MessageTypes[1],
-              new string[] { "Child", "Payload", "RepeatedChild", });
+              new string[] { "Child", "Payload", "RepeatedChild", }, new string[] { });
       internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestDeprecatedFields), descriptor.MessageTypes[2],
-              new string[] { "DeprecatedInt32", });
+              new string[] { "DeprecatedInt32", }, new string[] { });
       internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.ForeignMessage), descriptor.MessageTypes[3],
-              new string[] { "C", });
+              new string[] { "C", }, new string[] { });
       internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestReservedFields), descriptor.MessageTypes[4],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_protobuf_unittest_TestForeignNested__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestForeignNested), descriptor.MessageTypes[5],
-              new string[] { "ForeignNested", });
+              new string[] { "ForeignNested", }, new string[] { });
       internal__static_protobuf_unittest_TestReallyLargeTagNumber__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestReallyLargeTagNumber), descriptor.MessageTypes[6],
-              new string[] { "A", "Bb", });
+              new string[] { "A", "Bb", }, new string[] { });
       internal__static_protobuf_unittest_TestRecursiveMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestRecursiveMessage), descriptor.MessageTypes[7],
-              new string[] { "A", "I", });
+              new string[] { "A", "I", }, new string[] { });
       internal__static_protobuf_unittest_TestMutualRecursionA__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMutualRecursionA), descriptor.MessageTypes[8],
-              new string[] { "Bb", });
+              new string[] { "Bb", }, new string[] { });
       internal__static_protobuf_unittest_TestMutualRecursionB__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMutualRecursionB), descriptor.MessageTypes[9],
-              new string[] { "A", "OptionalInt32", });
+              new string[] { "A", "OptionalInt32", }, new string[] { });
       internal__static_protobuf_unittest_TestCamelCaseFieldNames__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestCamelCaseFieldNames), descriptor.MessageTypes[10],
-              new string[] { "PrimitiveField", "StringField", "EnumField", "MessageField", "RepeatedPrimitiveField", "RepeatedStringField", "RepeatedEnumField", "RepeatedMessageField", });
+              new string[] { "PrimitiveField", "StringField", "EnumField", "MessageField", "RepeatedPrimitiveField", "RepeatedStringField", "RepeatedEnumField", "RepeatedMessageField", }, new string[] { });
       internal__static_protobuf_unittest_TestFieldOrderings__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestFieldOrderings), descriptor.MessageTypes[11],
-              new string[] { "MyString", "MyInt", "MyFloat", "SingleNestedMessage", });
+              new string[] { "MyString", "MyInt", "MyFloat", "SingleNestedMessage", }, new string[] { });
       internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestFieldOrderings.Types.NestedMessage), descriptor.MessageTypes[11].NestedTypes[0],
-              new string[] { "Oo", "Bb", });
+              new string[] { "Oo", "Bb", }, new string[] { });
       internal__static_protobuf_unittest_SparseEnumMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.SparseEnumMessage), descriptor.MessageTypes[12],
-              new string[] { "SparseEnum", });
+              new string[] { "SparseEnum", }, new string[] { });
       internal__static_protobuf_unittest_OneString__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.OneString), descriptor.MessageTypes[13],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_MoreString__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MoreString), descriptor.MessageTypes[14],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_OneBytes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.OneBytes), descriptor.MessageTypes[15],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_MoreBytes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MoreBytes), descriptor.MessageTypes[16],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_Int32Message__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Int32Message), descriptor.MessageTypes[17],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_Uint32Message__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Uint32Message), descriptor.MessageTypes[18],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_Int64Message__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Int64Message), descriptor.MessageTypes[19],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_Uint64Message__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Uint64Message), descriptor.MessageTypes[20],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_BoolMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.BoolMessage), descriptor.MessageTypes[21],
-              new string[] { "Data", });
+              new string[] { "Data", }, new string[] { });
       internal__static_protobuf_unittest_TestOneof__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestOneof), descriptor.MessageTypes[22],
-              new string[] { "FooInt", "FooString", "FooMessage", "Foo", });
+              new string[] { "FooInt", "FooString", "FooMessage", }, new string[] { "Foo", });
       internal__static_protobuf_unittest_TestPackedTypes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestPackedTypes), descriptor.MessageTypes[23],
-              new string[] { "PackedInt32", "PackedInt64", "PackedUint32", "PackedUint64", "PackedSint32", "PackedSint64", "PackedFixed32", "PackedFixed64", "PackedSfixed32", "PackedSfixed64", "PackedFloat", "PackedDouble", "PackedBool", "PackedEnum", });
+              new string[] { "PackedInt32", "PackedInt64", "PackedUint32", "PackedUint64", "PackedSint32", "PackedSint64", "PackedFixed32", "PackedFixed64", "PackedSfixed32", "PackedSfixed64", "PackedFloat", "PackedDouble", "PackedBool", "PackedEnum", }, new string[] { });
       internal__static_protobuf_unittest_TestUnpackedTypes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestUnpackedTypes), descriptor.MessageTypes[24],
-              new string[] { "UnpackedInt32", "UnpackedInt64", "UnpackedUint32", "UnpackedUint64", "UnpackedSint32", "UnpackedSint64", "UnpackedFixed32", "UnpackedFixed64", "UnpackedSfixed32", "UnpackedSfixed64", "UnpackedFloat", "UnpackedDouble", "UnpackedBool", "UnpackedEnum", });
+              new string[] { "UnpackedInt32", "UnpackedInt64", "UnpackedUint32", "UnpackedUint64", "UnpackedSint32", "UnpackedSint64", "UnpackedFixed32", "UnpackedFixed64", "UnpackedSfixed32", "UnpackedSfixed64", "UnpackedFloat", "UnpackedDouble", "UnpackedBool", "UnpackedEnum", }, new string[] { });
       internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestRepeatedScalarDifferentTagSizes), descriptor.MessageTypes[25],
-              new string[] { "RepeatedFixed32", "RepeatedInt32", "RepeatedFixed64", "RepeatedInt64", "RepeatedFloat", "RepeatedUint64", });
+              new string[] { "RepeatedFixed32", "RepeatedInt32", "RepeatedFixed64", "RepeatedInt64", "RepeatedFloat", "RepeatedUint64", }, new string[] { });
       internal__static_protobuf_unittest_TestCommentInjectionMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestCommentInjectionMessage), descriptor.MessageTypes[26],
-              new string[] { "A", });
+              new string[] { "A", }, new string[] { });
       internal__static_protobuf_unittest_FooRequest__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooRequest), descriptor.MessageTypes[27],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_protobuf_unittest_FooResponse__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooResponse), descriptor.MessageTypes[28],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_protobuf_unittest_FooClientMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooClientMessage), descriptor.MessageTypes[29],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_protobuf_unittest_FooServerMessage__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooServerMessage), descriptor.MessageTypes[30],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_protobuf_unittest_BarRequest__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.BarRequest), descriptor.MessageTypes[31],
-              new string[] { });
+              new string[] { }, new string[] { });
       internal__static_protobuf_unittest_BarResponse__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.BarResponse), descriptor.MessageTypes[32],
-              new string[] { });
+              new string[] { }, new string[] { });
     }
     #endregion
 
@@ -1019,6 +1019,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (SingleInt32 != 0) {
         output.WriteRawTag(8);
@@ -1695,6 +1699,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Bb != 0) {
             output.WriteRawTag(8);
@@ -1842,6 +1850,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (child_ != null) {
         output.WriteRawTag(10);
@@ -1991,6 +2003,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (DeprecatedInt32 != 0) {
         output.WriteRawTag(8);
@@ -2106,6 +2122,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (C != 0) {
         output.WriteRawTag(8);
@@ -2208,6 +2228,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -2310,6 +2334,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (foreignNested_ != null) {
         output.WriteRawTag(10);
@@ -2444,6 +2472,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (A != 0) {
         output.WriteRawTag(8);
@@ -2587,6 +2619,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (a_ != null) {
         output.WriteRawTag(10);
@@ -2723,6 +2759,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (bb_ != null) {
         output.WriteRawTag(10);
@@ -2858,6 +2898,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (a_ != null) {
         output.WriteRawTag(10);
@@ -3080,6 +3124,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (PrimitiveField != 0) {
         output.WriteRawTag(8);
@@ -3313,6 +3361,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (MyInt != 0L) {
         output.WriteRawTag(8);
@@ -3490,6 +3542,10 @@ namespace Google.Protobuf.TestProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Bb != 0) {
             output.WriteRawTag(8);
@@ -3624,6 +3680,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (SparseEnum != global::Google.Protobuf.TestProtos.TestSparseEnum.TEST_SPARSE_ENUM_UNSPECIFIED) {
         output.WriteRawTag(8);
@@ -3739,6 +3799,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data.Length != 0) {
         output.WriteRawTag(10);
@@ -3853,6 +3917,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       data_.WriteTo(output, _repeated_data_codec);
     }
@@ -3961,6 +4029,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data.Length != 0) {
         output.WriteRawTag(10);
@@ -4076,6 +4148,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data.Length != 0) {
         output.WriteRawTag(10);
@@ -4191,6 +4267,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data != 0) {
         output.WriteRawTag(8);
@@ -4306,6 +4386,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data != 0) {
         output.WriteRawTag(8);
@@ -4421,6 +4505,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data != 0L) {
         output.WriteRawTag(8);
@@ -4536,6 +4624,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data != 0UL) {
         output.WriteRawTag(8);
@@ -4651,6 +4743,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Data != false) {
         output.WriteRawTag(8);
@@ -4820,6 +4916,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteRawTag(8);
@@ -5125,6 +5225,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       packedInt32_.WriteTo(output, _repeated_packedInt32_codec);
       packedInt64_.WriteTo(output, _repeated_packedInt64_codec);
@@ -5492,6 +5596,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       unpackedInt32_.WriteTo(output, _repeated_unpackedInt32_codec);
       unpackedInt64_.WriteTo(output, _repeated_unpackedInt64_codec);
@@ -5764,6 +5872,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       repeatedFixed32_.WriteTo(output, _repeated_repeatedFixed32_codec);
       repeatedInt32_.WriteTo(output, _repeated_repeatedInt32_codec);
@@ -5913,6 +6025,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (A.Length != 0) {
         output.WriteRawTag(10);
@@ -6015,6 +6131,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -6103,6 +6223,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -6191,6 +6315,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -6279,6 +6407,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -6367,6 +6499,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
@@ -6455,6 +6591,10 @@ namespace Google.Protobuf.TestProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
     }
 
diff --git a/csharp/src/ProtocolBuffers/DescriptorProtos/DescriptorProtoFile.cs b/csharp/src/ProtocolBuffers/DescriptorProtos/DescriptorProtoFile.cs
index c87b367a..52f0c4b2 100644
--- a/csharp/src/ProtocolBuffers/DescriptorProtos/DescriptorProtoFile.cs
+++ b/csharp/src/ProtocolBuffers/DescriptorProtos/DescriptorProtoFile.cs
@@ -161,70 +161,70 @@ namespace Google.Protobuf.DescriptorProtos {
           });
       internal__static_google_protobuf_FileDescriptorSet__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.FileDescriptorSet), descriptor.MessageTypes[0],
-              new string[] { "File", });
+              new string[] { "File", }, new string[] { });
       internal__static_google_protobuf_FileDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.FileDescriptorProto), descriptor.MessageTypes[1],
-              new string[] { "Name", "Package", "Dependency", "PublicDependency", "WeakDependency", "MessageType", "EnumType", "Service", "Extension", "Options", "SourceCodeInfo", "Syntax", });
+              new string[] { "Name", "Package", "Dependency", "PublicDependency", "WeakDependency", "MessageType", "EnumType", "Service", "Extension", "Options", "SourceCodeInfo", "Syntax", }, new string[] { });
       internal__static_google_protobuf_DescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.DescriptorProto), descriptor.MessageTypes[2],
-              new string[] { "Name", "Field", "Extension", "NestedType", "EnumType", "ExtensionRange", "OneofDecl", "Options", "ReservedRange", "ReservedName", });
+              new string[] { "Name", "Field", "Extension", "NestedType", "EnumType", "ExtensionRange", "OneofDecl", "Options", "ReservedRange", "ReservedName", }, new string[] { });
       internal__static_google_protobuf_DescriptorProto_ExtensionRange__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.DescriptorProto.Types.ExtensionRange), descriptor.MessageTypes[2].NestedTypes[0],
-              new string[] { "Start", "End", });
+              new string[] { "Start", "End", }, new string[] { });
       internal__static_google_protobuf_DescriptorProto_ReservedRange__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.DescriptorProto.Types.ReservedRange), descriptor.MessageTypes[2].NestedTypes[1],
-              new string[] { "Start", "End", });
+              new string[] { "Start", "End", }, new string[] { });
       internal__static_google_protobuf_FieldDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.FieldDescriptorProto), descriptor.MessageTypes[3],
-              new string[] { "Name", "Number", "Label", "Type", "TypeName", "Extendee", "DefaultValue", "OneofIndex", "Options", });
+              new string[] { "Name", "Number", "Label", "Type", "TypeName", "Extendee", "DefaultValue", "OneofIndex", "Options", }, new string[] { });
       internal__static_google_protobuf_OneofDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.OneofDescriptorProto), descriptor.MessageTypes[4],
-              new string[] { "Name", });
+              new string[] { "Name", }, new string[] { });
       internal__static_google_protobuf_EnumDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.EnumDescriptorProto), descriptor.MessageTypes[5],
-              new string[] { "Name", "Value", "Options", });
+              new string[] { "Name", "Value", "Options", }, new string[] { });
       internal__static_google_protobuf_EnumValueDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.EnumValueDescriptorProto), descriptor.MessageTypes[6],
-              new string[] { "Name", "Number", "Options", });
+              new string[] { "Name", "Number", "Options", }, new string[] { });
       internal__static_google_protobuf_ServiceDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.ServiceDescriptorProto), descriptor.MessageTypes[7],
-              new string[] { "Name", "Method", "Options", });
+              new string[] { "Name", "Method", "Options", }, new string[] { });
       internal__static_google_protobuf_MethodDescriptorProto__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.MethodDescriptorProto), descriptor.MessageTypes[8],
-              new string[] { "Name", "InputType", "OutputType", "Options", "ClientStreaming", "ServerStreaming", });
+              new string[] { "Name", "InputType", "OutputType", "Options", "ClientStreaming", "ServerStreaming", }, new string[] { });
       internal__static_google_protobuf_FileOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.FileOptions), descriptor.MessageTypes[9],
-              new string[] { "JavaPackage", "JavaOuterClassname", "JavaMultipleFiles", "JavaGenerateEqualsAndHash", "JavaStringCheckUtf8", "OptimizeFor", "GoPackage", "CcGenericServices", "JavaGenericServices", "PyGenericServices", "Deprecated", "CcEnableArenas", "ObjcClassPrefix", "CsharpNamespace", "UninterpretedOption", });
+              new string[] { "JavaPackage", "JavaOuterClassname", "JavaMultipleFiles", "JavaGenerateEqualsAndHash", "JavaStringCheckUtf8", "OptimizeFor", "GoPackage", "CcGenericServices", "JavaGenericServices", "PyGenericServices", "Deprecated", "CcEnableArenas", "ObjcClassPrefix", "CsharpNamespace", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_MessageOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.MessageOptions), descriptor.MessageTypes[10],
-              new string[] { "MessageSetWireFormat", "NoStandardDescriptorAccessor", "Deprecated", "MapEntry", "UninterpretedOption", });
+              new string[] { "MessageSetWireFormat", "NoStandardDescriptorAccessor", "Deprecated", "MapEntry", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_FieldOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.FieldOptions), descriptor.MessageTypes[11],
-              new string[] { "Ctype", "Packed", "Jstype", "Lazy", "Deprecated", "Weak", "UninterpretedOption", });
+              new string[] { "Ctype", "Packed", "Jstype", "Lazy", "Deprecated", "Weak", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_EnumOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.EnumOptions), descriptor.MessageTypes[12],
-              new string[] { "AllowAlias", "Deprecated", "UninterpretedOption", });
+              new string[] { "AllowAlias", "Deprecated", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_EnumValueOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.EnumValueOptions), descriptor.MessageTypes[13],
-              new string[] { "Deprecated", "UninterpretedOption", });
+              new string[] { "Deprecated", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_ServiceOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.ServiceOptions), descriptor.MessageTypes[14],
-              new string[] { "Deprecated", "UninterpretedOption", });
+              new string[] { "Deprecated", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_MethodOptions__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.MethodOptions), descriptor.MessageTypes[15],
-              new string[] { "Deprecated", "UninterpretedOption", });
+              new string[] { "Deprecated", "UninterpretedOption", }, new string[] { });
       internal__static_google_protobuf_UninterpretedOption__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.UninterpretedOption), descriptor.MessageTypes[16],
-              new string[] { "Name", "IdentifierValue", "PositiveIntValue", "NegativeIntValue", "DoubleValue", "StringValue", "AggregateValue", });
+              new string[] { "Name", "IdentifierValue", "PositiveIntValue", "NegativeIntValue", "DoubleValue", "StringValue", "AggregateValue", }, new string[] { });
       internal__static_google_protobuf_UninterpretedOption_NamePart__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.UninterpretedOption.Types.NamePart), descriptor.MessageTypes[16].NestedTypes[0],
-              new string[] { "NamePart_", "IsExtension", });
+              new string[] { "NamePart_", "IsExtension", }, new string[] { });
       internal__static_google_protobuf_SourceCodeInfo__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.SourceCodeInfo), descriptor.MessageTypes[17],
-              new string[] { "Location", });
+              new string[] { "Location", }, new string[] { });
       internal__static_google_protobuf_SourceCodeInfo_Location__FieldAccessorTable = 
           new pb::FieldAccess.FieldAccessorTable(typeof(global::Google.Protobuf.DescriptorProtos.SourceCodeInfo.Types.Location), descriptor.MessageTypes[17].NestedTypes[0],
-              new string[] { "Path", "Span", "LeadingComments", "TrailingComments", "LeadingDetachedComments", });
+              new string[] { "Path", "Span", "LeadingComments", "TrailingComments", "LeadingDetachedComments", }, new string[] { });
     }
     #endregion
 
@@ -299,6 +299,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       file_.WriteTo(output, _repeated_file_codec);
     }
@@ -545,6 +549,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -889,6 +897,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -1094,6 +1106,10 @@ namespace Google.Protobuf.DescriptorProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Start != 0) {
             output.WriteRawTag(8);
@@ -1236,6 +1252,10 @@ namespace Google.Protobuf.DescriptorProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (Start != 0) {
             output.WriteRawTag(8);
@@ -1475,6 +1495,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -1741,6 +1765,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -1882,6 +1910,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -2051,6 +2083,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -2226,6 +2262,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -2434,6 +2474,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Name.Length != 0) {
         output.WriteRawTag(10);
@@ -2806,6 +2850,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (JavaPackage.Length != 0) {
         output.WriteRawTag(10);
@@ -3173,6 +3221,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (MessageSetWireFormat != false) {
         output.WriteRawTag(8);
@@ -3414,6 +3466,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Ctype != global::Google.Protobuf.DescriptorProtos.FieldOptions.Types.CType.STRING) {
         output.WriteRawTag(8);
@@ -3649,6 +3705,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (AllowAlias != false) {
         output.WriteRawTag(16);
@@ -3797,6 +3857,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Deprecated != false) {
         output.WriteRawTag(8);
@@ -3931,6 +3995,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Deprecated != false) {
         output.WriteRawTag(136, 2);
@@ -4065,6 +4133,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       if (Deprecated != false) {
         output.WriteRawTag(136, 2);
@@ -4264,6 +4336,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       name_.WriteTo(output, _repeated_name_codec);
       if (IdentifierValue.Length != 0) {
@@ -4470,6 +4546,10 @@ namespace Google.Protobuf.DescriptorProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           if (NamePart_.Length != 0) {
             output.WriteRawTag(10);
@@ -4603,6 +4683,10 @@ namespace Google.Protobuf.DescriptorProtos {
       return hash;
     }
 
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
     public void WriteTo(pb::CodedOutputStream output) {
       location_.WriteTo(output, _repeated_location_codec);
     }
@@ -4761,6 +4845,10 @@ namespace Google.Protobuf.DescriptorProtos {
           return hash;
         }
 
+        public override string ToString() {
+          return pb::JsonFormatter.Default.Format(this);
+        }
+
         public void WriteTo(pb::CodedOutputStream output) {
           path_.WriteTo(output, _repeated_path_codec);
           span_.WriteTo(output, _repeated_span_codec);
diff --git a/csharp/src/ProtocolBuffers/Descriptors/EnumDescriptor.cs b/csharp/src/ProtocolBuffers/Descriptors/EnumDescriptor.cs
index a6db5268..57860e61 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/EnumDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Descriptors/EnumDescriptor.cs
@@ -89,6 +89,7 @@ namespace Google.Protobuf.Descriptors
         /// <summary>

         /// Finds an enum value by number. If multiple enum values have the

         /// same number, this returns the first defined value with that number.

+        /// If there is no value for the given number, this returns <c>null</c>.

         /// </summary>

         public EnumValueDescriptor FindValueByNumber(int number)

         {

diff --git a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
index 57ea9c87..80be93f5 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
@@ -42,6 +42,7 @@ namespace Google.Protobuf.FieldAccess
     public sealed class FieldAccessorTable

     {

         private readonly ReadOnlyCollection<IFieldAccessor> accessors;

+        private readonly ReadOnlyCollection<OneofAccessor> oneofs;

         private readonly MessageDescriptor descriptor;

 

         /// <summary>

@@ -51,7 +52,7 @@ namespace Google.Protobuf.FieldAccess
         /// <param name="type">The CLR type for the message.</param>

         /// <param name="descriptor">The type's descriptor</param>

         /// <param name="propertyNames">The Pascal-case names of all the field-based properties in the message.</param>

-        public FieldAccessorTable(Type type, MessageDescriptor descriptor, string[] propertyNames)

+        public FieldAccessorTable(Type type, MessageDescriptor descriptor, string[] propertyNames, string[] oneofPropertyNames)

         {

             this.descriptor = descriptor;

             var accessorsArray = new IFieldAccessor[descriptor.Fields.Count];

@@ -65,7 +66,13 @@ namespace Google.Protobuf.FieldAccess
                     : (IFieldAccessor) new SingleFieldAccessor(type, name, field);

             }

             accessors = new ReadOnlyCollection<IFieldAccessor>(accessorsArray);

-            // TODO(jonskeet): Oneof support

+            var oneofsArray = new OneofAccessor[descriptor.Oneofs.Count];

+            for (int i = 0; i < oneofsArray.Length; i++)

+            {

+                var oneof = descriptor.Oneofs[i];

+                oneofsArray[i] = new OneofAccessor(type, oneofPropertyNames[i], oneof);

+            }

+            oneofs = new ReadOnlyCollection<OneofAccessor>(oneofsArray);

         }

 

         // TODO: Validate the name here... should possibly make this type a more "general reflection access" type,

@@ -75,6 +82,10 @@ namespace Google.Protobuf.FieldAccess
         /// </summary>

         public ReadOnlyCollection<IFieldAccessor> Accessors { get { return accessors; } }

 

+        public ReadOnlyCollection<OneofAccessor> Oneofs { get { return oneofs; } }

+

+        // TODO: Review this, as it's easy to get confused between FieldNumber and Index.

+        // Currently only used to get an accessor related to a oneof... maybe just make that simpler?

         public IFieldAccessor this[int fieldNumber]

         {

             get

@@ -83,17 +94,5 @@ namespace Google.Protobuf.FieldAccess
                 return accessors[field.Index];

             }

         }

-

-        internal IFieldAccessor this[FieldDescriptor field]

-        {

-            get

-            {

-                if (field.ContainingType != descriptor)

-                {

-                    throw new ArgumentException("FieldDescriptor does not match message type.");

-                }

-                return accessors[field.Index];

-            }

-        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/IFieldAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/IFieldAccessor.cs
index 77e7146d..d1727cb4 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/IFieldAccessor.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/IFieldAccessor.cs
@@ -44,6 +44,8 @@ namespace Google.Protobuf.FieldAccess
         /// </summary>

         FieldDescriptor Descriptor { get; }

 

+        // TODO: Should the argument type for these messages by IReflectedMessage?

+

         /// <summary>

         /// Clears the field in the specified message. (For repeated fields,

         /// this clears the list.)

diff --git a/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs
index feaa6232..590b6309 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs
@@ -30,62 +30,57 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #endregion

 

+using Google.Protobuf.Descriptors;

+using System;

+using System.Reflection;

+

 namespace Google.Protobuf.FieldAccess

 {

-    // TODO(jonskeet): Add "new" oneof API support

-

     /// <summary>

-    /// Access for an oneof

+    /// Reflection access for a oneof, allowing clear and "get case" actions.

     /// </summary>

-    internal class OneofAccessor<TMessage> where TMessage : IMessage<TMessage>

+    public sealed class OneofAccessor

     {

-        /*

-        private readonly Func<TMessage, object> caseDelegate;

-        private readonly Func<TBuilder, IBuilder> clearDelegate;

-        private MessageDescriptor descriptor;

+        private readonly Func<object, int> caseDelegate;

+        private readonly Action<object> clearDelegate;

+        private OneofDescriptor descriptor;

 

-        internal OneofAccessor(MessageDescriptor descriptor, string name) 

+        internal OneofAccessor(Type type, string propertyName, OneofDescriptor descriptor) 

         {

-            this.descriptor = descriptor;

-            MethodInfo clearMethod = typeof(TBuilder).GetMethod("Clear" + name);

-            PropertyInfo caseProperty = typeof(TMessage).GetProperty(name + "Case");

-            if (clearMethod == null || caseProperty == null)

+            PropertyInfo property = type.GetProperty(propertyName + "Case");

+            if (property == null || !property.CanRead)

             {

-                throw new ArgumentException("Not all required properties/methods available for oneof");

+                throw new ArgumentException("Not all required properties/methods available");

             }

-            

+            this.descriptor = descriptor;

+            caseDelegate = ReflectionUtil.CreateFuncObjectT<int>(property.GetGetMethod());

 

-            clearDelegate = ReflectionUtil.CreateDelegateFunc<TBuilder, IBuilder>(clearMethod);

-            caseDelegate = ReflectionUtil.CreateUpcastDelegate<TMessage>(caseProperty.GetGetMethod());

+            this.descriptor = descriptor;

+            MethodInfo clearMethod = type.GetMethod("Clear" + propertyName);

+            clearDelegate = ReflectionUtil.CreateActionObject(clearMethod);

         }

 

-        /// <summary>

-        /// Indicates whether the specified message has set any field in the oneof.

-        /// </summary>

-        public bool Has(TMessage message)

-        {

-            return ((int) caseDelegate(message) != 0);

-        }

+        public OneofDescriptor Descriptor { get { return descriptor; } }

 

         /// <summary>

-        /// Clears the oneof in the specified builder.

+        /// Clears the oneof in the specified message.

         /// </summary>

-        public void Clear(TBuilder builder)

+        public void Clear(object message)

         {

-            clearDelegate(builder);

+            clearDelegate(message);

         }

 

         /// <summary>

         /// Indicates which field in the oneof is set for specified message

         /// </summary>

-        public virtual FieldDescriptor GetOneofFieldDescriptor(TMessage message)

+        public FieldDescriptor GetCaseFieldDescriptor(object message)

         {

-            int fieldNumber = (int) caseDelegate(message);

+            int fieldNumber = caseDelegate(message);

             if (fieldNumber > 0)

             {

-                return descriptor.FindFieldByNumber(fieldNumber);

+                return descriptor.ContainingType.FindFieldByNumber(fieldNumber);

             }

             return null;

-        }*/

+        }

     }

 }

diff --git a/csharp/src/ProtocolBuffers/FieldAccess/ReflectionUtil.cs b/csharp/src/ProtocolBuffers/FieldAccess/ReflectionUtil.cs
index d3053920..08ef6c0c 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/ReflectionUtil.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/ReflectionUtil.cs
@@ -63,7 +63,20 @@ namespace Google.Protobuf.FieldAccess
             Expression upcast = Expression.Convert(call, typeof(object));

             return Expression.Lambda<Func<object, object>>(upcast, parameter).Compile();

         }

-        

+

+        /// <summary>

+        /// Creates a delegate which will cast the argument to the appropriate method target type,

+        /// call the method on it, then convert the result to the specified type.

+        /// </summary>

+        internal static Func<object, T> CreateFuncObjectT<T>(MethodInfo method)

+        {

+            ParameterExpression parameter = Expression.Parameter(typeof(object), "p");

+            Expression downcast = Expression.Convert(parameter, method.DeclaringType);

+            Expression call = Expression.Call(downcast, method);

+            Expression upcast = Expression.Convert(call, typeof(T));

+            return Expression.Lambda<Func<object, T>>(upcast, parameter).Compile();

+        }

+

         /// <summary>

         /// Creates a delegate which will execute the given method after casting the first argument to

         /// the target type of the method, and the second argument to the first parameter type of the method.

diff --git a/csharp/src/ProtocolBuffers/IMessage.cs b/csharp/src/ProtocolBuffers/IMessage.cs
index ad44668c..3324e9ae 100644
--- a/csharp/src/ProtocolBuffers/IMessage.cs
+++ b/csharp/src/ProtocolBuffers/IMessage.cs
@@ -40,9 +40,9 @@ namespace Google.Protobuf
     // TODO(jonskeet): Split these interfaces into separate files when we're happy with them.

 

     /// <summary>

-    /// Reflection support for a specific message type.

+    /// Reflection support for accessing field values.

     /// </summary>

-    public interface IReflectedMessage

+    public interface IReflectedMessage : IMessage

     {

         FieldAccessorTable Fields { get; }

         // TODO(jonskeet): Descriptor? Or a single property which has "all you need for reflection"?

@@ -81,7 +81,7 @@ namespace Google.Protobuf
     /// the implementation class.

     /// </summary>

     /// <typeparam name="T">The message type.</typeparam>

-    public interface IMessage<T> : IMessage, IEquatable<T>, IDeepCloneable<T>, IFreezable where T : IMessage<T>

+    public interface IMessage<T> : IReflectedMessage, IEquatable<T>, IDeepCloneable<T>, IFreezable where T : IMessage<T>

     {

         /// <summary>

         /// Merges the given message into this one.

diff --git a/csharp/src/ProtocolBuffers/JsonFormatter.cs b/csharp/src/ProtocolBuffers/JsonFormatter.cs
new file mode 100644
index 00000000..9bd628eb
--- /dev/null
+++ b/csharp/src/ProtocolBuffers/JsonFormatter.cs
@@ -0,0 +1,579 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections;
+using System.Globalization;
+using System.Text;
+using Google.Protobuf.Descriptors;
+using Google.Protobuf.FieldAccess;
+
+namespace Google.Protobuf
+{
+    /// <summary>
+    /// Reflection-based converter from messages to JSON.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// Instances of this class are thread-safe, with no mutable state.
+    /// </para>
+    /// <para>
+    /// This is a simple start to get JSON formatting working. As it's reflection-based,
+    /// it's not as quick as baking calls into generated messages - but is a simpler implementation.
+    /// (This code is generally not heavily optimized.)
+    /// </para>
+    /// </remarks>
+    public sealed class JsonFormatter
+    {
+        private static JsonFormatter defaultInstance = new JsonFormatter(Settings.Default);
+
+        /// <summary>
+        /// Returns a formatter using the default settings.
+        /// </summary>
+        public static JsonFormatter Default { get { return defaultInstance; } }
+
+        /// <summary>
+        /// The JSON representation of the first 160 characters of Unicode.
+        /// Empty strings are replaced by the static constructor.
+        /// </summary>
+        private static readonly string[] CommonRepresentations = {
+            // C0 (ASCII and derivatives) control characters
+            "\\u0000", "\\u0001", "\\u0002", "\\u0003",  // 0x00
+          "\\u0004", "\\u0005", "\\u0006", "\\u0007",
+          "\\b",     "\\t",     "\\n",     "\\u000b",
+          "\\f",     "\\r",     "\\u000e", "\\u000f",
+          "\\u0010", "\\u0011", "\\u0012", "\\u0013",  // 0x10
+          "\\u0014", "\\u0015", "\\u0016", "\\u0017",
+          "\\u0018", "\\u0019", "\\u001a", "\\u001b",
+          "\\u001c", "\\u001d", "\\u001e", "\\u001f",
+            // Escaping of " and \ are required by www.json.org string definition.
+            // Escaping of < and > are required for HTML security.
+            "", "", "\\\"", "", "",        "", "",        "",  // 0x20
+          "", "", "",     "", "",        "", "",        "",
+          "", "", "",     "", "",        "", "",        "",  // 0x30
+          "", "", "",     "", "\\u003c", "", "\\u003e", "",
+          "", "", "",     "", "",        "", "",        "",  // 0x40
+          "", "", "",     "", "",        "", "",        "",
+          "", "", "",     "", "",        "", "",        "",  // 0x50
+          "", "", "",     "", "\\\\",    "", "",        "",
+          "", "", "",     "", "",        "", "",        "",  // 0x60
+          "", "", "",     "", "",        "", "",        "",
+          "", "", "",     "", "",        "", "",        "",  // 0x70
+          "", "", "",     "", "",        "", "",        "\\u007f",
+            // C1 (ISO 8859 and Unicode) extended control characters
+            "\\u0080", "\\u0081", "\\u0082", "\\u0083",  // 0x80
+          "\\u0084", "\\u0085", "\\u0086", "\\u0087",
+          "\\u0088", "\\u0089", "\\u008a", "\\u008b",
+          "\\u008c", "\\u008d", "\\u008e", "\\u008f",
+          "\\u0090", "\\u0091", "\\u0092", "\\u0093",  // 0x90
+          "\\u0094", "\\u0095", "\\u0096", "\\u0097",
+          "\\u0098", "\\u0099", "\\u009a", "\\u009b",
+          "\\u009c", "\\u009d", "\\u009e", "\\u009f"
+        };
+
+        static JsonFormatter()
+        {
+            for (int i = 0; i < CommonRepresentations.Length; i++)
+            {
+                if (CommonRepresentations[i] == "")
+                {
+                    CommonRepresentations[i] = ((char) i).ToString();
+                }
+            }
+        }
+
+        private readonly Settings settings;
+
+        public JsonFormatter(Settings settings)
+        {
+            this.settings = settings;
+        }
+
+        public string Format(IReflectedMessage message)
+        {
+            ThrowHelper.ThrowIfNull(message, "message");
+            StringBuilder builder = new StringBuilder();
+            WriteMessage(builder, message);
+            return builder.ToString();
+        }
+
+        private void WriteMessage(StringBuilder builder, IReflectedMessage message)
+        {
+            if (message == null)
+            {
+                WriteNull(builder);
+                return;
+            }
+            builder.Append("{ ");
+            var fields = message.Fields;
+            bool first = true;
+            // First non-oneof fields
+            foreach (var accessor in fields.Accessors)
+            {
+                var descriptor = accessor.Descriptor;
+                // Oneofs are written later
+                // TODO: Change to write out fields in order, interleaving oneofs appropriately (as per binary format)
+                if (descriptor.ContainingOneof != null)
+                {
+                    continue;
+                }
+                // Omit default values unless we're asked to format them
+                object value = accessor.GetValue(message);
+                if (!settings.FormatDefaultValues && IsDefaultValue(accessor, value))
+                {
+                    continue;
+                }
+                // Omit awkward (single) values such as unknown enum values
+                if (!descriptor.IsRepeated && !descriptor.IsMap && !CanWriteSingleValue(accessor.Descriptor, value))
+                {
+                    continue;
+                }
+
+                // Okay, all tests complete: let's write the field value...
+                if (!first)
+                {
+                    builder.Append(", ");
+                }
+                WriteString(builder, ToCamelCase(accessor.Descriptor.Name));
+                builder.Append(": ");
+                WriteValue(builder, accessor, value);
+                first = false;
+            }
+
+            // Now oneofs
+            foreach (var accessor in fields.Oneofs)
+            {
+                var fieldDescriptor = accessor.GetCaseFieldDescriptor(message);
+                if (fieldDescriptor == null)
+                {
+                    continue;
+                }
+                var fieldAccessor = fields[fieldDescriptor.FieldNumber];
+                object value = fieldAccessor.GetValue(message);
+                // Omit awkward (single) values such as unknown enum values
+                if (!fieldDescriptor.IsRepeated && !fieldDescriptor.IsMap && !CanWriteSingleValue(fieldDescriptor, value))
+                {
+                    continue;
+                }
+
+                if (!first)
+                {
+                    builder.Append(", ");
+                }
+                WriteString(builder, ToCamelCase(fieldDescriptor.Name));
+                builder.Append(": ");
+                WriteValue(builder, fieldAccessor, value);
+                first = false;
+            }
+            builder.Append(first ? "}" : " }");
+        }
+
+        // Converted from src/google/protobuf/util/internal/utility.cc ToCamelCase
+        internal static string ToCamelCase(string input)
+        {
+            bool capitalizeNext = false;
+            bool wasCap = true;
+            bool isCap = false;
+            bool firstWord = true;
+            StringBuilder result = new StringBuilder(input.Length);
+
+            for (int i = 0; i < input.Length; i++, wasCap = isCap)
+            {
+                isCap = char.IsUpper(input[i]);
+                if (input[i] == '_')
+                {
+                    capitalizeNext = true;
+                    if (result.Length != 0)
+                    {
+                        firstWord = false;
+                    }
+                    continue;
+                }
+                else if (firstWord)
+                {
+                    // Consider when the current character B is capitalized,
+                    // first word ends when:
+                    // 1) following a lowercase:   "...aB..."
+                    // 2) followed by a lowercase: "...ABc..."
+                    if (result.Length != 0 && isCap &&
+                        (!wasCap || (i + 1 < input.Length && char.IsLower(input[i + 1]))))
+                    {
+                        firstWord = false;
+                    }
+                    else
+                    {
+                        result.Append(char.ToLowerInvariant(input[i]));
+                        continue;
+                    }
+                }
+                else if (capitalizeNext)
+                {
+                    capitalizeNext = false;
+                    if (char.IsLower(input[i]))
+                    {
+                        result.Append(char.ToUpperInvariant(input[i]));
+                        continue;
+                    }
+                }
+                result.Append(input[i]);
+            }
+            return result.ToString();
+        }
+        
+        private static void WriteNull(StringBuilder builder)
+        {
+            builder.Append("null");
+        }
+
+        private static bool IsDefaultValue(IFieldAccessor accessor, object value)
+        {
+            if (accessor.Descriptor.IsMap)
+            {
+                IDictionary dictionary = (IDictionary) value;
+                return dictionary.Count == 0;
+            }
+            if (accessor.Descriptor.IsRepeated)
+            {
+                IList list = (IList) value;
+                return list.Count == 0;
+            }
+            switch (accessor.Descriptor.FieldType)
+            {
+                case FieldType.Bool:
+                    return (bool) value == false;
+                case FieldType.Bytes:
+                    return (ByteString) value == ByteString.Empty;
+                case FieldType.String:
+                    return (string) value == "";
+                case FieldType.Double:
+                    return (double) value == 0.0;
+                case FieldType.SInt32:
+                case FieldType.Int32:
+                case FieldType.SFixed32:
+                case FieldType.Enum:
+                    return (int) value == 0;
+                case FieldType.Fixed32:
+                case FieldType.UInt32:
+                    return (uint) value == 0;
+                case FieldType.Fixed64:
+                case FieldType.UInt64:
+                    return (ulong) value == 0;
+                case FieldType.SFixed64:
+                case FieldType.Int64:
+                case FieldType.SInt64:
+                    return (long) value == 0;
+                case FieldType.Float:
+                    return (float) value == 0f;
+                case FieldType.Message:
+                case FieldType.Group: // Never expect to get this, but...
+                    return value == null;
+                default:
+                    throw new ArgumentException("Invalid field type");
+            }
+        }
+
+        private void WriteValue(StringBuilder builder, IFieldAccessor accessor, object value)
+        {
+            if (accessor.Descriptor.IsMap)
+            {
+                WriteDictionary(builder, accessor, (IDictionary) value);
+            }
+            else if (accessor.Descriptor.IsRepeated)
+            {
+                WriteList(builder, accessor, (IList) value);
+            }
+            else
+            {
+                WriteSingleValue(builder, accessor.Descriptor, value);
+            }
+        }
+
+        private void WriteSingleValue(StringBuilder builder, FieldDescriptor descriptor, object value)
+        {
+            switch (descriptor.FieldType)
+            {
+                case FieldType.Bool:
+                    builder.Append((bool) value ? "true" : "false");
+                    break;
+                case FieldType.Bytes:
+                    // Nothing in Base64 needs escaping
+                    builder.Append('"');
+                    builder.Append(((ByteString) value).ToBase64());
+                    builder.Append('"');
+                    break;
+                case FieldType.String:
+                    WriteString(builder, (string) value);
+                    break;
+                case FieldType.Fixed32:
+                case FieldType.UInt32:
+                case FieldType.SInt32:
+                case FieldType.Int32:
+                case FieldType.SFixed32:
+                    {
+                        IFormattable formattable = (IFormattable) value;
+                        builder.Append(formattable.ToString("d", CultureInfo.InvariantCulture));
+                        break;
+                    }
+                case FieldType.Enum:
+                    EnumValueDescriptor enumValue = descriptor.EnumType.FindValueByNumber((int) value);
+                    // We will already have validated that this is a known value.
+                    WriteString(builder, enumValue.Name);
+                    break;
+                case FieldType.Fixed64:
+                case FieldType.UInt64:
+                case FieldType.SFixed64:
+                case FieldType.Int64:
+                case FieldType.SInt64:
+                    {
+                        builder.Append('"');
+                        IFormattable formattable = (IFormattable) value;
+                        builder.Append(formattable.ToString("d", CultureInfo.InvariantCulture));
+                        builder.Append('"');
+                        break;
+                    }
+                case FieldType.Double:
+                case FieldType.Float:
+                    string text = ((IFormattable) value).ToString("r", CultureInfo.InvariantCulture);
+                    if (text == "NaN" || text == "Infinity" || text == "-Infinity")
+                    {
+                        builder.Append('"');
+                        builder.Append(text);
+                        builder.Append('"');
+                    }
+                    else
+                    {
+                        builder.Append(text);
+                    }
+                    break;
+                case FieldType.Message:
+                case FieldType.Group: // Never expect to get this, but...
+                    WriteMessage(builder, (IReflectedMessage) value);
+                    break;
+                default:
+                    throw new ArgumentException("Invalid field type: " + descriptor.FieldType);
+            }
+        }
+
+        private void WriteList(StringBuilder builder, IFieldAccessor accessor, IList list)
+        {
+            builder.Append("[ ");
+            bool first = true;
+            foreach (var value in list)
+            {
+                if (!CanWriteSingleValue(accessor.Descriptor, value))
+                {
+                    continue;
+                }
+                if (!first)
+                {
+                    builder.Append(", ");
+                }
+                WriteSingleValue(builder, accessor.Descriptor, value);
+                first = false;
+            }
+            builder.Append(first ? "]" : " ]");
+        }
+
+        private void WriteDictionary(StringBuilder builder, IFieldAccessor accessor, IDictionary dictionary)
+        {
+            builder.Append("{ ");
+            bool first = true;
+            FieldDescriptor keyType = accessor.Descriptor.MessageType.FindFieldByNumber(1);
+            FieldDescriptor valueType = accessor.Descriptor.MessageType.FindFieldByNumber(2);
+            // This will box each pair. Could use IDictionaryEnumerator, but that's ugly in terms of disposal.
+            foreach (DictionaryEntry pair in dictionary)
+            {
+                if (!CanWriteSingleValue(valueType, pair.Value))
+                {
+                    continue;
+                }
+                if (!first)
+                {
+                    builder.Append(", ");
+                }
+                string keyText;
+                switch (keyType.FieldType)
+                {
+                    case FieldType.String:
+                        keyText = (string) pair.Key;
+                        break;
+                    case FieldType.Bool:
+                        keyText = (bool) pair.Key ? "true" : "false";
+                        break;
+                    case FieldType.Fixed32:
+                    case FieldType.Fixed64:
+                    case FieldType.SFixed32:
+                    case FieldType.SFixed64:
+                    case FieldType.Int32:
+                    case FieldType.Int64:
+                    case FieldType.SInt32:
+                    case FieldType.SInt64:
+                    case FieldType.UInt32:
+                    case FieldType.UInt64:
+                        keyText = ((IFormattable) pair.Key).ToString("d", CultureInfo.InvariantCulture);
+                        break;
+                    default:
+                        throw new ArgumentException("Invalid key type: " + keyType.FieldType);
+                }
+                WriteString(builder, keyText);
+                builder.Append(": ");
+                WriteSingleValue(builder, valueType, pair.Value);
+                first = false;
+            }
+            builder.Append(first ? "}" : " }");
+        }
+
+        /// <summary>
+        /// Returns whether or not a singular value can be represented in JSON.
+        /// Currently only relevant for enums, where unknown values can't be represented.
+        /// For repeated/map fields, this always returns true.
+        /// </summary>
+        private bool CanWriteSingleValue(FieldDescriptor descriptor, object value)
+        {
+            if (descriptor.FieldType == FieldType.Enum)
+            {
+                EnumValueDescriptor enumValue = descriptor.EnumType.FindValueByNumber((int) value);
+                return enumValue != null;
+            }
+            return true;
+        }
+
+        /// <summary>
+        /// Writes a string (including leading and trailing double quotes) to a builder, escaping as required.
+        /// </summary>
+        /// <remarks>
+        /// Other than surrogate pair handling, this code is mostly taken from src/google/protobuf/util/internal/json_escaping.cc.
+        /// </remarks>
+        private void WriteString(StringBuilder builder, string text)
+        {
+            builder.Append('"');
+            for (int i = 0; i < text.Length; i++)
+            {
+                char c = text[i];
+                if (c < 0xa0)
+                {
+                    builder.Append(CommonRepresentations[c]);
+                    continue;
+                }
+                if (char.IsHighSurrogate(c))
+                {
+                    // Encountered first part of a surrogate pair.
+                    // Check that we have the whole pair, and encode both parts as hex.
+                    i++;
+                    if (i == text.Length || !char.IsLowSurrogate(text[i]))
+                    {
+                        throw new ArgumentException("String contains low surrogate not followed by high surrogate");
+                    }
+                    HexEncodeUtf16CodeUnit(builder, c);
+                    HexEncodeUtf16CodeUnit(builder, text[i]);
+                    continue;
+                }
+                else if (char.IsLowSurrogate(c))
+                {
+                    throw new ArgumentException("String contains high surrogate not preceded by low surrogate");
+                }
+                switch ((uint) c)
+                {
+                    // These are not required by json spec
+                    // but used to prevent security bugs in javascript.
+                    case 0xfeff:  // Zero width no-break space
+                    case 0xfff9:  // Interlinear annotation anchor
+                    case 0xfffa:  // Interlinear annotation separator
+                    case 0xfffb:  // Interlinear annotation terminator
+
+                    case 0x00ad:  // Soft-hyphen
+                    case 0x06dd:  // Arabic end of ayah
+                    case 0x070f:  // Syriac abbreviation mark
+                    case 0x17b4:  // Khmer vowel inherent Aq
+                    case 0x17b5:  // Khmer vowel inherent Aa
+                        HexEncodeUtf16CodeUnit(builder, c);
+                        break;
+
+                    default:
+                        if ((c >= 0x0600 && c <= 0x0603) ||  // Arabic signs
+                            (c >= 0x200b && c <= 0x200f) ||  // Zero width etc.
+                            (c >= 0x2028 && c <= 0x202e) ||  // Separators etc.
+                            (c >= 0x2060 && c <= 0x2064) ||  // Invisible etc.
+                            (c >= 0x206a && c <= 0x206f))
+                        {
+                            HexEncodeUtf16CodeUnit(builder, c);
+                        }
+                        else
+                        {
+                            // No handling of surrogates here - that's done earlier
+                            builder.Append(c);
+                        }
+                        break;
+                }
+            }
+            builder.Append('"');
+        }
+
+        private const string Hex = "0123456789abcdef";
+        private static void HexEncodeUtf16CodeUnit(StringBuilder builder, char c)
+        {
+            uint utf16 = c;
+            builder.Append("\\u");
+            builder.Append(Hex[(c >> 12) & 0xf]);
+            builder.Append(Hex[(c >> 8) & 0xf]);
+            builder.Append(Hex[(c >> 4) & 0xf]);
+            builder.Append(Hex[(c >> 0) & 0xf]);
+        }
+
+        /// <summary>
+        /// Settings controlling JSON formatting.
+        /// </summary>
+        public sealed class Settings
+        {
+            private static readonly Settings defaultInstance = new Settings(false);
+
+            /// <summary>
+            /// Default settings, as used by <see cref="JsonFormatter.Default"/>
+            /// </summary>
+            public static Settings Default { get { return defaultInstance; } }
+
+            private readonly bool formatDefaultValues;
+
+
+            /// <summary>
+            /// Whether fields whose values are the default for the field type (e.g. 0 for integers)
+            /// should be formatted (true) or omitted (false).
+            /// </summary>
+            public bool FormatDefaultValues { get { return formatDefaultValues; } }
+
+            public Settings(bool formatDefaultValues)
+            {
+                this.formatDefaultValues = formatDefaultValues;
+            }
+        }
+    }
+}
diff --git a/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj b/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
index acfade59..f5dd6d5a 100644
--- a/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
+++ b/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
@@ -81,6 +81,7 @@
     <Compile Include="FieldCodec.cs" />

     <Compile Include="FrameworkPortability.cs" />

     <Compile Include="Freezable.cs" />

+    <Compile Include="JsonFormatter.cs" />

     <Compile Include="MessageExtensions.cs" />

     <Compile Include="FieldAccess\FieldAccessorBase.cs" />

     <Compile Include="FieldAccess\ReflectionUtil.cs" />