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.

Language Design Discussion

We are now taking language feature discussion in other repositories:

• https://github.com/dotnet/csharplang for C# specific issues
• https://github.com/dotnet/vblang for VB-specific features
• https://github.com/dotnet/csharplang for features that affect both languages

Discussion about the transition of language design to the new repos is at dotnet#18002.

Download C# and Visual Basic

Want to start developing in C# and Visual Basic? Download Visual Studio 2019, which has the latest features built-in. There are also prebuilt Azure VM images available with Visual Studio 2019 already installed.

To install the latest release without Visual Studio, download the .NET SDK nightlies.

See what's new with the C# and VB compilers.

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://devdiv.pkgs.visualstudio.com/_packaging/vssdk/nuget/v3/index.json
• .NET SDK: https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json

Source code

• Clone the sources: git clone https://github.com/dotnet/roslyn.git
• Enhanced source view, powered by Roslyn
• Building, testing and debugging the sources

Get started

• Tutorial articles by Alex Turner in MSDN Magazine
  • Use Roslyn to Write a Live Code Analyzer for Your API
  • Adding a Code Fix to your Roslyn Analyzer
• Roslyn Overview
• API Changes between CTP 6 and RC
• Samples and Walkthroughs
• Documentation
• Analyzer documentation
• Syntax Visualizer Tool
• Syntax Quoter Tool
• Roadmap
• Language Design Notes
• FAQ

Contribute!

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

• How to Contribute
• Pull requests: Open/Closed

Looking for something to work on? The list of up for grabs issues is a great place to start.

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.

Continuous Integration status

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	Release
master
master-vs-deps

Misc Tests

Branch	Determinism	Build Correctness	Spanish	Mono
master
master-vs-deps