Fixed removal of all '_' from names, Added unit test.

build/build.csproj

@@ -36,6 +36,7 @@
     <WorkingDirectories Include="$(BuildTempDirectory)" />
     <WorkingDirectories Include="$(BuildOutputDirectory)" />
 
+    <Protos Include="$(ProtosDirectory)\extest\unittest_issues.proto" />
     <Protos Include="$(ProtosDirectory)\extest\unittest_extras_full.proto" />
     <Protos Include="$(ProtosDirectory)\extest\unittest_extras_lite.proto" />
     <Protos Include="$(ProtosDirectory)\extest\unittest_extras_xmltest.proto" />
@@ -71,6 +72,9 @@
       <TargetDirectory>$(SourceDirectory)\AddressBook</TargetDirectory>
     </GeneratedSource>
     <!-- Unit test -->
+    <GeneratedSource Include="$(BuildTempDirectory)\UnitTestExtrasIssuesProtoFile.cs">
+      <TargetDirectory>$(SourceDirectory)\ProtocolBuffers.Test\TestProtos</TargetDirectory>
+    </GeneratedSource>
     <GeneratedSource Include="$(BuildTempDirectory)\UnitTestXmlSerializerTestProtoFile.cs">
       <TargetDirectory>$(SourceDirectory)\ProtocolBuffers.Test\TestProtos</TargetDirectory>
     </GeneratedSource>

protos/extest/unittest_issues.proto

+// These proto descriptors have at one time been reported as an issue or defect.
+// They are kept here to replicate the issue, and continue to verify the fix.
+import "google/protobuf/csharp_options.proto";
+
+// Issue: Non-"Google.Protobuffers" namespace will ensure that protobuffer library types are qualified
+option (google.protobuf.csharp_file_options).namespace = "UnitTest.Issues.TestProtos";
+option (google.protobuf.csharp_file_options).umbrella_classname = "UnitTestExtrasIssuesProtoFile";
+
+package unittest_issues;
+option optimize_for = SPEED;
+
+// The following is a representative set of features
+/*
+enum EnumOptions {
+    ONE = 0;
+    TWO = 1;
+    THREE = 2;
+}
+
+message TestBasicChild
+{
+    repeated EnumOptions options = 3;
+    optional bytes binary = 4;
+}
+
+message TestBasicNoFields {
+}
+
+message TestBasicRescursive {
+    optional TestBasicRescursive child = 1;
+}
+
+message TestBasicMessage {
+
+    optional int64 number = 6;
+    repeated int32 numbers = 2;
+    optional string text = 3;
+    repeated string textlines = 700;
+    optional bool valid = 5;
+    
+    optional TestBasicChild child = 1;
+    repeated group Children = 401 
+    {
+        repeated EnumOptions options = 3;
+        optional bytes binary = 4;
+    }
+
+    extensions 100 to 199;
+}
+
+message  TestBasicExtension {
+  required int32 number = 1;
+}
+  
+extend TestBasicMessage {
+  optional EnumOptions extension_enum = 101;
+  optional string extension_text = 102;
+  repeated int32 extension_number = 103 [packed = true];
+  optional TestBasicExtension extension_message = 199;
+}
+
+// Issue for non-qualified type reference in new services generation
+option (google.protobuf.csharp_file_options).service_generator_type = IRPCDISPATCH;
+
+service TestGenericService {
+  rpc Foo(TestBasicNoFields) returns (TestBasicMessage);
+  rpc Bar(TestBasicNoFields) returns (TestBasicMessage);
+}
+*/
+// Issue 13: http://code.google.com/p/protobuf-csharp-port/issues/detail?id=13
+ 
+message A {
+    optional int32 _A = 1;
+}
+
+message B {
+    optional int32 B_ = 1;
+}
+
+message AB {
+    optional int32 a_b = 1;
+}

src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj

@@ -104,6 +104,7 @@
     <Compile Include="TestProtos\UnitTestCustomOptionsProtoFile.cs" />
     <Compile Include="TestProtos\UnitTestEmbedOptimizeForProtoFile.cs" />
     <Compile Include="TestProtos\UnitTestEmptyProtoFile.cs" />
+    <Compile Include="TestProtos\UnitTestExtrasIssuesProtoFile.cs" />
     <Compile Include="TestProtos\UnitTestGenericServices.cs" />
     <Compile Include="TestProtos\UnitTestGoogleSizeProtoFile.cs" />
     <Compile Include="TestProtos\UnitTestGoogleSpeedProtoFile.cs" />

src/ProtocolBuffers.Test/TestProtos/UnitTestExtrasIssuesProtoFile.cs

+// Generated by ProtoGen, Version=2.3.0.277, Culture=neutral, PublicKeyToken=17b3b1f090c3ea48.  DO NOT EDIT!
+
+using pb = global::Google.ProtocolBuffers;
+using pbc = global::Google.ProtocolBuffers.Collections;
+using pbd = global::Google.ProtocolBuffers.Descriptors;
+using scg = global::System.Collections.Generic;
+namespace UnitTest.Issues.TestProtos {
+  
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+  [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+  public static partial class UnitTestExtrasIssuesProtoFile {
+  
+    #region Extension registration
+    public static void RegisterAllExtensions(pb::ExtensionRegistry registry) {
+    }
+    #endregion
+    #region Static variables
+    internal static pbd::MessageDescriptor internal__static_unittest_issues_A__Descriptor;
+    internal static pb::FieldAccess.FieldAccessorTable<global::UnitTest.Issues.TestProtos.A, global::UnitTest.Issues.TestProtos.A.Builder> internal__static_unittest_issues_A__FieldAccessorTable;
+    internal static pbd::MessageDescriptor internal__static_unittest_issues_B__Descriptor;
+    internal static pb::FieldAccess.FieldAccessorTable<global::UnitTest.Issues.TestProtos.B, global::UnitTest.Issues.TestProtos.B.Builder> internal__static_unittest_issues_B__FieldAccessorTable;
+    internal static pbd::MessageDescriptor internal__static_unittest_issues_AB__Descriptor;
+    internal static pb::FieldAccess.FieldAccessorTable<global::UnitTest.Issues.TestProtos.AB, global::UnitTest.Issues.TestProtos.AB.Builder> internal__static_unittest_issues_AB__FieldAccessorTable;
+    #endregion
+    #region Descriptor
+    public static pbd::FileDescriptor Descriptor {
+      get { return descriptor; }
+    }
+    private static pbd::FileDescriptor descriptor;
+    
+    static UnitTestExtrasIssuesProtoFile() {
+      byte[] descriptorData = global::System.Convert.FromBase64String(
+          "ChxleHRlc3QvdW5pdHRlc3RfaXNzdWVzLnByb3RvEg91bml0dGVzdF9pc3N1" + 
+          "ZXMaJGdvb2dsZS9wcm90b2J1Zi9jc2hhcnBfb3B0aW9ucy5wcm90byIPCgFB" + 
+          "EgoKAl9BGAEgASgFIg8KAUISCgoCQl8YASABKAUiEQoCQUISCwoDYV9iGAEg" + 
+          "ASgFQkBIAcI+OwoaVW5pdFRlc3QuSXNzdWVzLlRlc3RQcm90b3MSHVVuaXRU" + 
+          "ZXN0RXh0cmFzSXNzdWVzUHJvdG9GaWxl");
+      pbd::FileDescriptor.InternalDescriptorAssigner assigner = delegate(pbd::FileDescriptor root) {
+        descriptor = root;
+        internal__static_unittest_issues_A__Descriptor = Descriptor.MessageTypes[0];
+        internal__static_unittest_issues_A__FieldAccessorTable = 
+            new pb::FieldAccess.FieldAccessorTable<global::UnitTest.Issues.TestProtos.A, global::UnitTest.Issues.TestProtos.A.Builder>(internal__static_unittest_issues_A__Descriptor,
+                new string[] { "A_", });
+        internal__static_unittest_issues_B__Descriptor = Descriptor.MessageTypes[1];
+        internal__static_unittest_issues_B__FieldAccessorTable = 
+            new pb::FieldAccess.FieldAccessorTable<global::UnitTest.Issues.TestProtos.B, global::UnitTest.Issues.TestProtos.B.Builder>(internal__static_unittest_issues_B__Descriptor,
+                new string[] { "B_", });
+        internal__static_unittest_issues_AB__Descriptor = Descriptor.MessageTypes[2];
+        internal__static_unittest_issues_AB__FieldAccessorTable = 
+            new pb::FieldAccess.FieldAccessorTable<global::UnitTest.Issues.TestProtos.AB, global::UnitTest.Issues.TestProtos.AB.Builder>(internal__static_unittest_issues_AB__Descriptor,
+                new string[] { "AB_", });
+        pb::ExtensionRegistry registry = pb::ExtensionRegistry.CreateInstance();
+        RegisterAllExtensions(registry);
+        global::Google.ProtocolBuffers.DescriptorProtos.CSharpOptions.RegisterAllExtensions(registry);
+        return registry;
+      };
+      pbd::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
+          new pbd::FileDescriptor[] {
+          global::Google.ProtocolBuffers.DescriptorProtos.CSharpOptions.Descriptor, 
+          }, assigner);
+    }
+    #endregion
+    
+  }
+  #region Messages
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+  [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+  public sealed partial class A : pb::GeneratedMessage<A, A.Builder> {
+    private static readonly A defaultInstance = new Builder().BuildPartial();
+    private static readonly string[] _aFieldNames = new string[] { "_A" };
+    private static readonly uint[] _aFieldTags = new uint[] { 8 };
+    public static A DefaultInstance {
+      get { return defaultInstance; }
+    }
+    
+    public override A DefaultInstanceForType {
+      get { return defaultInstance; }
+    }
+    
+    protected override A ThisMessage {
+      get { return this; }
+    }
+    
+    public static pbd::MessageDescriptor Descriptor {
+      get { return global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.internal__static_unittest_issues_A__Descriptor; }
+    }
+    
+    protected override pb::FieldAccess.FieldAccessorTable<A, A.Builder> InternalFieldAccessors {
+      get { return global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.internal__static_unittest_issues_A__FieldAccessorTable; }
+    }
+    
+    public const int A_FieldNumber = 1;
+    private bool hasA_;
+    private int a_;
+    public bool HasA_ {
+      get { return hasA_; }
+    }
+    [global::System.CLSCompliant(false)]
+    public int A_ {
+      get { return a_; }
+    }
+    
+    public override bool IsInitialized {
+      get {
+        return true;
+      }
+    }
+    
+    public override void WriteTo(pb::ICodedOutputStream output) {
+      int size = SerializedSize;
+      string[] field_names = _aFieldNames;
+      if (hasA_) {
+        output.WriteInt32(1, field_names[0], A_);
+      }
+      UnknownFields.WriteTo(output);
+    }
+    
+    private int memoizedSerializedSize = -1;
+    public override int SerializedSize {
+      get {
+        int size = memoizedSerializedSize;
+        if (size != -1) return size;
+        
+        size = 0;
+        if (hasA_) {
+          size += pb::CodedOutputStream.ComputeInt32Size(1, A_);
+        }
+        size += UnknownFields.SerializedSize;
+        memoizedSerializedSize = size;
+        return size;
+      }
+    }
+    
+    public static A ParseFrom(pb::ByteString data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static A ParseFrom(pb::ByteString data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static A ParseFrom(byte[] data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static A ParseFrom(byte[] data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static A ParseFrom(global::System.IO.Stream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static A ParseFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static A ParseDelimitedFrom(global::System.IO.Stream input) {
+      return CreateBuilder().MergeDelimitedFrom(input).BuildParsed();
+    }
+    public static A ParseDelimitedFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return CreateBuilder().MergeDelimitedFrom(input, extensionRegistry).BuildParsed();
+    }
+    public static A ParseFrom(pb::ICodedInputStream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static A ParseFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static Builder CreateBuilder() { return new Builder(); }
+    public override Builder ToBuilder() { return CreateBuilder(this); }
+    public override Builder CreateBuilderForType() { return new Builder(); }
+    public static Builder CreateBuilder(A prototype) {
+      return (Builder) new Builder().MergeFrom(prototype);
+    }
+    
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+    public sealed partial class Builder : pb::GeneratedBuilder<A, Builder> {
+      protected override Builder ThisBuilder {
+        get { return this; }
+      }
+      public Builder() {}
+      
+      A result = new A();
+      
+      protected override A MessageBeingBuilt {
+        get { return result; }
+      }
+      
+      public override Builder Clear() {
+        result = new A();
+        return this;
+      }
+      
+      public override Builder Clone() {
+        return new Builder().MergeFrom(result);
+      }
+      
+      public override pbd::MessageDescriptor DescriptorForType {
+        get { return global::UnitTest.Issues.TestProtos.A.Descriptor; }
+      }
+      
+      public override A DefaultInstanceForType {
+        get { return global::UnitTest.Issues.TestProtos.A.DefaultInstance; }
+      }
+      
+      public override A BuildPartial() {
+        if (result == null) {
+          throw new global::System.InvalidOperationException("build() has already been called on this Builder");
+        }
+        A returnMe = result;
+        result = null;
+        return returnMe;
+      }
+      
+      public override Builder MergeFrom(pb::IMessage other) {
+        if (other is A) {
+          return MergeFrom((A) other);
+        } else {
+          base.MergeFrom(other);
+          return this;
+        }
+      }
+      
+      public override Builder MergeFrom(A other) {
+        if (other == global::UnitTest.Issues.TestProtos.A.DefaultInstance) return this;
+        if (other.HasA_) {
+          A_ = other.A_;
+        }
+        this.MergeUnknownFields(other.UnknownFields);
+        return this;
+      }
+      
+      public override Builder MergeFrom(pb::ICodedInputStream input) {
+        return MergeFrom(input, pb::ExtensionRegistry.Empty);
+      }
+      
+      public override Builder MergeFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+        pb::UnknownFieldSet.Builder unknownFields = null;
+        uint tag;
+        string field_name;
+        while (input.ReadTag(out tag, out field_name)) {
+          if(tag == 0 && field_name != null) {
+            int field_ordinal = global::System.Array.BinarySearch(_aFieldNames, field_name, global::System.StringComparer.Ordinal);
+            if(field_ordinal >= 0)
+              tag = _aFieldTags[field_ordinal];
+            else {
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              continue;
+            }
+          }
+          switch (tag) {
+            case 0: {
+              throw pb::InvalidProtocolBufferException.InvalidTag();
+            }
+            default: {
+              if (pb::WireFormat.IsEndGroupTag(tag)) {
+                if (unknownFields != null) {
+                  this.UnknownFields = unknownFields.Build();
+                }
+                return this;
+              }
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              break;
+            }
+            case 8: {
+              result.hasA_ = input.ReadInt32(ref result.a_);
+              break;
+            }
+          }
+        }
+        
+        if (unknownFields != null) {
+          this.UnknownFields = unknownFields.Build();
+        }
+        return this;
+      }
+      
+      
+      public bool HasA_ {
+        get { return result.hasA_; }
+      }
+      [global::System.CLSCompliant(false)]
+      public int A_ {
+        get { return result.A_; }
+        set { SetA_(value); }
+      }
+      [global::System.CLSCompliant(false)]
+      public Builder SetA_(int value) {
+        result.hasA_ = true;
+        result.a_ = value;
+        return this;
+      }
+      public Builder ClearA_() {
+        result.hasA_ = false;
+        result.a_ = 0;
+        return this;
+      }
+    }
+    static A() {
+      object.ReferenceEquals(global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.Descriptor, null);
+    }
+  }
+  
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+  [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+  public sealed partial class B : pb::GeneratedMessage<B, B.Builder> {
+    private static readonly B defaultInstance = new Builder().BuildPartial();
+    private static readonly string[] _bFieldNames = new string[] { "B_" };
+    private static readonly uint[] _bFieldTags = new uint[] { 8 };
+    public static B DefaultInstance {
+      get { return defaultInstance; }
+    }
+    
+    public override B DefaultInstanceForType {
+      get { return defaultInstance; }
+    }
+    
+    protected override B ThisMessage {
+      get { return this; }
+    }
+    
+    public static pbd::MessageDescriptor Descriptor {
+      get { return global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.internal__static_unittest_issues_B__Descriptor; }
+    }
+    
+    protected override pb::FieldAccess.FieldAccessorTable<B, B.Builder> InternalFieldAccessors {
+      get { return global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.internal__static_unittest_issues_B__FieldAccessorTable; }
+    }
+    
+    public const int B_FieldNumber = 1;
+    private bool hasB_;
+    private int b_;
+    public bool HasB_ {
+      get { return hasB_; }
+    }
+    public int B_ {
+      get { return b_; }
+    }
+    
+    public override bool IsInitialized {
+      get {
+        return true;
+      }
+    }
+    
+    public override void WriteTo(pb::ICodedOutputStream output) {
+      int size = SerializedSize;
+      string[] field_names = _bFieldNames;
+      if (hasB_) {
+        output.WriteInt32(1, field_names[0], B_);
+      }
+      UnknownFields.WriteTo(output);
+    }
+    
+    private int memoizedSerializedSize = -1;
+    public override int SerializedSize {
+      get {
+        int size = memoizedSerializedSize;
+        if (size != -1) return size;
+        
+        size = 0;
+        if (hasB_) {
+          size += pb::CodedOutputStream.ComputeInt32Size(1, B_);
+        }
+        size += UnknownFields.SerializedSize;
+        memoizedSerializedSize = size;
+        return size;
+      }
+    }
+    
+    public static B ParseFrom(pb::ByteString data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static B ParseFrom(pb::ByteString data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static B ParseFrom(byte[] data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static B ParseFrom(byte[] data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static B ParseFrom(global::System.IO.Stream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static B ParseFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static B ParseDelimitedFrom(global::System.IO.Stream input) {
+      return CreateBuilder().MergeDelimitedFrom(input).BuildParsed();
+    }
+    public static B ParseDelimitedFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return CreateBuilder().MergeDelimitedFrom(input, extensionRegistry).BuildParsed();
+    }
+    public static B ParseFrom(pb::ICodedInputStream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static B ParseFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static Builder CreateBuilder() { return new Builder(); }
+    public override Builder ToBuilder() { return CreateBuilder(this); }
+    public override Builder CreateBuilderForType() { return new Builder(); }
+    public static Builder CreateBuilder(B prototype) {
+      return (Builder) new Builder().MergeFrom(prototype);
+    }
+    
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+    public sealed partial class Builder : pb::GeneratedBuilder<B, Builder> {
+      protected override Builder ThisBuilder {
+        get { return this; }
+      }
+      public Builder() {}
+      
+      B result = new B();
+      
+      protected override B MessageBeingBuilt {
+        get { return result; }
+      }
+      
+      public override Builder Clear() {
+        result = new B();
+        return this;
+      }
+      
+      public override Builder Clone() {
+        return new Builder().MergeFrom(result);
+      }
+      
+      public override pbd::MessageDescriptor DescriptorForType {
+        get { return global::UnitTest.Issues.TestProtos.B.Descriptor; }
+      }
+      
+      public override B DefaultInstanceForType {
+        get { return global::UnitTest.Issues.TestProtos.B.DefaultInstance; }
+      }
+      
+      public override B BuildPartial() {
+        if (result == null) {
+          throw new global::System.InvalidOperationException("build() has already been called on this Builder");
+        }
+        B returnMe = result;
+        result = null;
+        return returnMe;
+      }
+      
+      public override Builder MergeFrom(pb::IMessage other) {
+        if (other is B) {
+          return MergeFrom((B) other);
+        } else {
+          base.MergeFrom(other);
+          return this;
+        }
+      }
+      
+      public override Builder MergeFrom(B other) {
+        if (other == global::UnitTest.Issues.TestProtos.B.DefaultInstance) return this;
+        if (other.HasB_) {
+          B_ = other.B_;
+        }
+        this.MergeUnknownFields(other.UnknownFields);
+        return this;
+      }
+      
+      public override Builder MergeFrom(pb::ICodedInputStream input) {
+        return MergeFrom(input, pb::ExtensionRegistry.Empty);
+      }
+      
+      public override Builder MergeFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+        pb::UnknownFieldSet.Builder unknownFields = null;
+        uint tag;
+        string field_name;
+        while (input.ReadTag(out tag, out field_name)) {
+          if(tag == 0 && field_name != null) {
+            int field_ordinal = global::System.Array.BinarySearch(_bFieldNames, field_name, global::System.StringComparer.Ordinal);
+            if(field_ordinal >= 0)
+              tag = _bFieldTags[field_ordinal];
+            else {
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              continue;
+            }
+          }
+          switch (tag) {
+            case 0: {
+              throw pb::InvalidProtocolBufferException.InvalidTag();
+            }
+            default: {
+              if (pb::WireFormat.IsEndGroupTag(tag)) {
+                if (unknownFields != null) {
+                  this.UnknownFields = unknownFields.Build();
+                }
+                return this;
+              }
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              break;
+            }
+            case 8: {
+              result.hasB_ = input.ReadInt32(ref result.b_);
+              break;
+            }
+          }
+        }
+        
+        if (unknownFields != null) {
+          this.UnknownFields = unknownFields.Build();
+        }
+        return this;
+      }
+      
+      
+      public bool HasB_ {
+        get { return result.hasB_; }
+      }
+      public int B_ {
+        get { return result.B_; }
+        set { SetB_(value); }
+      }
+      public Builder SetB_(int value) {
+        result.hasB_ = true;
+        result.b_ = value;
+        return this;
+      }
+      public Builder ClearB_() {
+        result.hasB_ = false;
+        result.b_ = 0;
+        return this;
+      }
+    }
+    static B() {
+      object.ReferenceEquals(global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.Descriptor, null);
+    }
+  }
+  
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+  [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+  public sealed partial class AB : pb::GeneratedMessage<AB, AB.Builder> {
+    private static readonly AB defaultInstance = new Builder().BuildPartial();
+    private static readonly string[] _aBFieldNames = new string[] { "a_b" };
+    private static readonly uint[] _aBFieldTags = new uint[] { 8 };
+    public static AB DefaultInstance {
+      get { return defaultInstance; }
+    }
+    
+    public override AB DefaultInstanceForType {
+      get { return defaultInstance; }
+    }
+    
+    protected override AB ThisMessage {
+      get { return this; }
+    }
+    
+    public static pbd::MessageDescriptor Descriptor {
+      get { return global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.internal__static_unittest_issues_AB__Descriptor; }
+    }
+    
+    protected override pb::FieldAccess.FieldAccessorTable<AB, AB.Builder> InternalFieldAccessors {
+      get { return global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.internal__static_unittest_issues_AB__FieldAccessorTable; }
+    }
+    
+    public const int AB_FieldNumber = 1;
+    private bool hasAB_;
+    private int aB_;
+    public bool HasAB_ {
+      get { return hasAB_; }
+    }
+    public int AB_ {
+      get { return aB_; }
+    }
+    
+    public override bool IsInitialized {
+      get {
+        return true;
+      }
+    }
+    
+    public override void WriteTo(pb::ICodedOutputStream output) {
+      int size = SerializedSize;
+      string[] field_names = _aBFieldNames;
+      if (hasAB_) {
+        output.WriteInt32(1, field_names[0], AB_);
+      }
+      UnknownFields.WriteTo(output);
+    }
+    
+    private int memoizedSerializedSize = -1;
+    public override int SerializedSize {
+      get {
+        int size = memoizedSerializedSize;
+        if (size != -1) return size;
+        
+        size = 0;
+        if (hasAB_) {
+          size += pb::CodedOutputStream.ComputeInt32Size(1, AB_);
+        }
+        size += UnknownFields.SerializedSize;
+        memoizedSerializedSize = size;
+        return size;
+      }
+    }
+    
+    public static AB ParseFrom(pb::ByteString data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static AB ParseFrom(pb::ByteString data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static AB ParseFrom(byte[] data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static AB ParseFrom(byte[] data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static AB ParseFrom(global::System.IO.Stream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static AB ParseFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static AB ParseDelimitedFrom(global::System.IO.Stream input) {
+      return CreateBuilder().MergeDelimitedFrom(input).BuildParsed();
+    }
+    public static AB ParseDelimitedFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return CreateBuilder().MergeDelimitedFrom(input, extensionRegistry).BuildParsed();
+    }
+    public static AB ParseFrom(pb::ICodedInputStream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static AB ParseFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static Builder CreateBuilder() { return new Builder(); }
+    public override Builder ToBuilder() { return CreateBuilder(this); }
+    public override Builder CreateBuilderForType() { return new Builder(); }
+    public static Builder CreateBuilder(AB prototype) {
+      return (Builder) new Builder().MergeFrom(prototype);
+    }
+    
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("ProtoGen", "2.3.0.277")]
+    public sealed partial class Builder : pb::GeneratedBuilder<AB, Builder> {
+      protected override Builder ThisBuilder {
+        get { return this; }
+      }
+      public Builder() {}
+      
+      AB result = new AB();
+      
+      protected override AB MessageBeingBuilt {
+        get { return result; }
+      }
+      
+      public override Builder Clear() {
+        result = new AB();
+        return this;
+      }
+      
+      public override Builder Clone() {
+        return new Builder().MergeFrom(result);
+      }
+      
+      public override pbd::MessageDescriptor DescriptorForType {
+        get { return global::UnitTest.Issues.TestProtos.AB.Descriptor; }
+      }
+      
+      public override AB DefaultInstanceForType {
+        get { return global::UnitTest.Issues.TestProtos.AB.DefaultInstance; }
+      }
+      
+      public override AB BuildPartial() {
+        if (result == null) {
+          throw new global::System.InvalidOperationException("build() has already been called on this Builder");
+        }
+        AB returnMe = result;
+        result = null;
+        return returnMe;
+      }
+      
+      public override Builder MergeFrom(pb::IMessage other) {
+        if (other is AB) {
+          return MergeFrom((AB) other);
+        } else {
+          base.MergeFrom(other);
+          return this;
+        }
+      }
+      
+      public override Builder MergeFrom(AB other) {
+        if (other == global::UnitTest.Issues.TestProtos.AB.DefaultInstance) return this;
+        if (other.HasAB_) {
+          AB_ = other.AB_;
+        }
+        this.MergeUnknownFields(other.UnknownFields);
+        return this;
+      }
+      
+      public override Builder MergeFrom(pb::ICodedInputStream input) {
+        return MergeFrom(input, pb::ExtensionRegistry.Empty);
+      }
+      
+      public override Builder MergeFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+        pb::UnknownFieldSet.Builder unknownFields = null;
+        uint tag;
+        string field_name;
+        while (input.ReadTag(out tag, out field_name)) {
+          if(tag == 0 && field_name != null) {
+            int field_ordinal = global::System.Array.BinarySearch(_aBFieldNames, field_name, global::System.StringComparer.Ordinal);
+            if(field_ordinal >= 0)
+              tag = _aBFieldTags[field_ordinal];
+            else {
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              continue;
+            }
+          }
+          switch (tag) {
+            case 0: {
+              throw pb::InvalidProtocolBufferException.InvalidTag();
+            }
+            default: {
+              if (pb::WireFormat.IsEndGroupTag(tag)) {
+                if (unknownFields != null) {
+                  this.UnknownFields = unknownFields.Build();
+                }
+                return this;
+              }
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              break;
+            }
+            case 8: {
+              result.hasAB_ = input.ReadInt32(ref result.aB_);
+              break;
+            }
+          }
+        }
+        
+        if (unknownFields != null) {
+          this.UnknownFields = unknownFields.Build();
+        }
+        return this;
+      }
+      
+      
+      public bool HasAB_ {
+        get { return result.hasAB_; }
+      }
+      public int AB_ {
+        get { return result.AB_; }
+        set { SetAB_(value); }
+      }
+      public Builder SetAB_(int value) {
+        result.hasAB_ = true;
+        result.aB_ = value;
+        return this;
+      }
+      public Builder ClearAB_() {
+        result.hasAB_ = false;
+        result.aB_ = 0;
+        return this;
+      }
+    }
+    static AB() {
+      object.ReferenceEquals(global::UnitTest.Issues.TestProtos.UnitTestExtrasIssuesProtoFile.Descriptor, null);
+    }
+  }
+  
+  #endregion
+  
+}

src/ProtocolBuffers/NameHelpers.cs

@@ -102,12 +102,12 @@ namespace Google.ProtocolBuffers
         /// <summary>
         /// Similar to UnderlineToCamel, but also matches the first character if it is lower-case
         /// </summary>
-        private static Regex UnderlineToPascal = new Regex(@"(?:^|[0-9_])[a-z]");
+        private static Regex UnderlineToPascal = new Regex(@"(?:(?:^|[0-9_])[a-z])|_");
 
         /// <summary>
         /// Matches lower-case character that follow either an underscore, or a number
         /// </summary>
-        private static Regex UnderlineToCamel = new Regex(@"[0-9_][a-z]");
+        private static Regex UnderlineToCamel = new Regex(@"(?:[0-9_][a-z])|_");
 
         /// <summary>
         /// Used for text-template transformation where a regex match is replaced in the input string.

src/ProtocolBuffers2008.sln

@@ -23,6 +23,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "unittest", "unittest", "{C8
 		..\protos\extest\unittest_generic_services.proto = ..\protos\extest\unittest_generic_services.proto
 		..\protos\google\protobuf\unittest_import.proto = ..\protos\google\protobuf\unittest_import.proto
 		..\protos\google\protobuf\unittest_import_lite.proto = ..\protos\google\protobuf\unittest_import_lite.proto
+		..\protos\extest\unittest_issues.proto = ..\protos\extest\unittest_issues.proto
 		..\protos\google\protobuf\unittest_lite.proto = ..\protos\google\protobuf\unittest_lite.proto
 		..\protos\google\protobuf\unittest_lite_imports_nonlite.proto = ..\protos\google\protobuf\unittest_lite_imports_nonlite.proto
 		..\protos\google\protobuf\unittest_mset.proto = ..\protos\google\protobuf\unittest_mset.proto
@@ -67,7 +68,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{66ED1950
 		..\build\RunBenchmarks.bat = ..\build\RunBenchmarks.bat
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ProtocolBuffers.Serialization", "ProtocolBuffers.Serialization\ProtocolBuffers.Serialization.csproj", "{231391AF-449C-4a39-986C-AD7F270F4750}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ProtocolBuffers.Serialization", "ProtocolBuffers.Serialization\ProtocolBuffers.Serialization.csproj", "{231391AF-449C-4A39-986C-AD7F270F4750}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -147,14 +148,10 @@ Global
 		{EEFFED24-3750-4567-9A23-1DB676A15610}.Release_Silverlight2|Any CPU.ActiveCfg = Release|Any CPU
 		{EEFFED24-3750-4567-9A23-1DB676A15610}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{EEFFED24-3750-4567-9A23-1DB676A15610}.Release|Any CPU.Build.0 = Release|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Debug_Silverlight2|Any CPU.ActiveCfg = Debug_Silverlight2|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Debug_Silverlight2|Any CPU.Build.0 = Debug_Silverlight2|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Release_Silverlight2|Any CPU.ActiveCfg = Release_Silverlight2|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Release_Silverlight2|Any CPU.Build.0 = Release_Silverlight2|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{231391AF-449C-4a39-986C-AD7F270F4750}.Release|Any CPU.Build.0 = Release|Any CPU
+		{231391AF-449C-4A39-986C-AD7F270F4750}.Debug_Silverlight2|Any CPU.ActiveCfg = Debug_Silverlight2|Any CPU
+		{231391AF-449C-4A39-986C-AD7F270F4750}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{231391AF-449C-4A39-986C-AD7F270F4750}.Release_Silverlight2|Any CPU.ActiveCfg = Release_Silverlight2|Any CPU
+		{231391AF-449C-4A39-986C-AD7F270F4750}.Release|Any CPU.ActiveCfg = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE