Custom Options C#, 'TypeInitializationException' System.IndexOutOfRangeException : Index was outside the bounds of the array

[towny-trp]

Version: 3.9.1
Language: C#
Linux & Windows
Protoc: Grpc.Tools.1.22.0

What did you do?
Steps to reproduce the behavior:

1. Create a simple custom option proto in TestAnnotations.proto:

extend google.protobuf.FieldOptions {
  string test_field_opt1 = 5640936;
}

2. Generate the c# code and compile via Grpc.Tools.1.22.0

3. Try and access the custom options:

var options = TestAnnotationsReflection.Descriptor.CustomOptions;

4. See error "System.IndexOutOfRangeException : Index was outside the bounds of the array"

at Google.Protobuf.Reflection.ExtensionCollection.<>c__DisplayClass2_0.<.ctor>b__0(FieldDescriptorProto extension, Int32 i) in C:\develop\protobuf-master\csharp\src\Google.Protobuf\Reflection\ExtensionCollection.cs:line 51
   at Google.Protobuf.Reflection.DescriptorUtil.ConvertAndMakeReadOnly[TInput,TOutput](IList`1 input, IndexedConverter`2 converter) in C:\develop\protobuf-master\csharp\src\Google.Protobuf\Reflection\DescriptorUtil.cs:line 59
   at Google.Protobuf.Reflection.ExtensionCollection..ctor(FileDescriptor file, Extension[] extensions) in C:\develop\protobuf-master\csharp\src\Google.Protobuf\Reflection\ExtensionCollection.cs:line 49
   at Google.Protobuf.Reflection.FileDescriptor..ctor(ByteString descriptorData, FileDescriptorProto proto, IEnumerable`1 dependencies, DescriptorPool pool, Boolean allowUnknownDependencies, GeneratedClrTypeInfo generatedCodeInfo) in C:\develop\protobuf-master\csharp\src\Google.Protobuf\Reflection\FileDescriptor.cs:line 87
   at Google.Protobuf.Reflection.FileDescriptor.BuildFrom(ByteString descriptorData, FileDescriptorProto proto, FileDescriptor[] dependencies, Boolean allowUnknownDependencies, GeneratedClrTypeInfo generatedCodeInfo) in C:\develop\protobuf-master\csharp\src\Google.Protobuf\Reflection\FileDescriptor.cs:line 340
   at Google.Protobuf.Reflection.FileDescriptor.FromGeneratedCode(Byte[] descriptorData, FileDescriptor[] dependencies, GeneratedClrTypeInfo generatedCodeInfo) in C:\develop\protobuf-master\csharp\src\Google.Protobuf\Reflection\FileDescriptor.cs:line 400
   at TestAnnotationsReflection..cctor()

Anything else we should know about your project / environment
Changing to use the Porotc Compiler to Google.Protobuf.Tools v 3.9.1 resolves this particular, unfortunately I can't use that as a work around as that introduces another error 'FieldOptions' is inaccessible due to its protection level for which I will log a separate bug.

[nycdotnet]

Looking forward to getting the 3.11 version of this (4.0?) Since we're stuck on 3.8 because of this exception.

[jtattermusch]

The patched nuget is now available: https://www.nuget.org/packages/Google.Protobuf/3.10.1
Can you please test and report back if it solves the issue.

[nycdotnet]

I know this is very old, but I can confirm that Google.Protobuf 3.11.3, Grpc 2.27 + Healthcheck + Reflection play nicely together. Thanks for the fix.