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Roslyn is the open-source implementation of both the C# and Visual Basic compilers with an API surface for building code analysis tools.

C# and Visual Basic Language Feature Suggestions

If you want to suggest a new feature for the C# or Visual Basic languages go here:

dotnet/csharplang for C# specific issues
dotnet/vblang for VB-specific features
dotnet/csharplang for features that affect both languages

Contributing

All work on the C# and Visual Basic compiler happens directly on GitHub. Both core team members and external contributors send pull requests which go through the same review process.

If you are interested in fixing issues and contributing directly to the code base, a great way to get started is to ask some questions on GitHub Discussions! Then check out our contributing guide which covers the following:

Coding guidelines
The development workflow, including debugging and running tests
Submitting pull requests
Finding a bug to fix in the IDE or Compiler
Finding a feature to implement in the IDE or Compiler
Roslyn API suggestions should go through the API review process

Community

The Roslyn community can be found on GitHub Discussions, where you can ask questions, voice ideas, and share your projects.

To chat with other community members, you can join the Roslyn Discord or Gitter.

Our Code of Conduct applies to all Roslyn community channels and has adopted the .NET Foundation Code of Conduct.

Documentation

Visit Roslyn Architecture Overview to get started with Roslyn’s API’s.

NuGet Feeds

The latest pre-release builds are available from the following public NuGet feeds:

Compiler: https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json
IDE Services: https://pkgs.dev.azure.com/azure-public/vside/_packaging/vssdk/nuget/v3/index.json
.NET SDK: https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json