Welcome to the .NET Compiler Platform ("Roslyn")

Roslyn provides open-source C# and Visual Basic compilers with rich code analysis APIs. It enables building code analysis tools with the same APIs that are used by Visual Studio.

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

Contribute!

Some of the best ways to contribute are to try things out, file bugs, and join in design conversations.

Questions

A great way to get started is to ask some questions!

• Start with a question on discussions
• You can also join in on the design discussions on gitter or discord

See if your issue is already being worked on! (Add your own votes using the 👍 reaction)

• IDE
• Compiler

Vote in the Backlog! (Add your own votes using the 👍 reaction)

• IDE Bugs
• IDE Features
• Compiler Bugs
• Compiler Features

Find a bug to fix! (Add your own votes using the 👍 reaction)

• First read this guide: How to Contribute
• Building, testing and debugging the sources
• Top Bugs
  • IDE
  • Compiler

Find a feature to implement! (Add your own votes using the 👍 reaction)

• IDE
• Compiler

Getting started with the Roslyn APIs

If you want to get started using Roslyn's APIs to analyzer your code take a look at these links:

• Roslyn Architecture Overview
  • Syntax APIs
  • Semantic APIs
  • Workspace APIs
• Tutorial: Write your first analyzer and code fix
• Useful Tools
  • Syntax Visualizer Tool
  • Syntax Quoter Tool
  • Browse the source with the enhanced source view

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

Continuous Integration status

Builds

Branch	Windows Debug	Windows Release	Unix Debug
master
master-vs-deps

Desktop Unit Tests

Branch	Debug x86	Debug x64	Release x86	Release x64
master
master-vs-deps

CoreClr Unit Tests

Branch	Windows Debug	Windows Release	Linux
master
master-vs-deps

Integration Tests

Branch	Debug x86	Debug x64	Release x86	Release x64
master
master-vs-deps

Misc Tests

Branch	Determinism	Build Correctness	Source build	Spanish	MacOS
master
master-vs-deps

This project has adopted the .NET Foundation Code of Conduct.

.NET Foundation

This project is part of the .NET Foundation along with other projects like the .NET Runtime.