Roslynator

Roslynator is a set of code analysis tools for C#, powered by Roslyn.

Tools

• IDE extensions for:
  • Visual Studio
  • VS Code
  • Open VSX
• NuGet packages that contain a collection of analyzers
  • Roslynator.Analyzers
  • Roslynator.CodeAnalysis.Analyzers
  • Roslynator.Formatting.Analyzers
• Testing framework for unit-testing analyzers, refactorings, and code fixes
• .NET API that extends the Roslyn API
• Command line tool

Contributions

Contributions are welcome! See the developer docs, contributing with agent skills, and open issues.

tip

Agent skills in the roslynator repo provide step-by-step workflows for bug fixes and new rules — and you can read them as plain contributor docs. Bugfixes or small improvements can be implemented right away. Larger tasks, such as adding a new analyzer or refactoring, should be discussed first.

Donations

Special thanks to:

• .NET on AWS Open Source Software Fund for donating $6000.00 USD ($500.00 for 12 months starting November 2024).
• Microsoft for donating $1000.00 USD.
• @IanKemp for donating $13.00 USD / month starting July 2021.
• @Genbox for donating $5.00 USD / month starting October 2024.
• Timo Nürnberg for donating $5.00 USD / month starting March 2025.

.NET Foundation

This project is supported by the .NET Foundation.

This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community. For more information see the .NET Foundation Code of Conduct.

Command Line Tool

To install the CLI:

dotnet tool install -g roslynator.dotnet.cli

See the CLI documentation.

Testing Framework

• Use the testing framework to unit-test analyzers, refactorings, and code fixes.
• The framework is available as a NuGet package.  
• Examples in the Roslynator repo:
  • Analyzer tests: Analyzers.Tests, CodeAnalysis.Analyzers.Tests, and Formatting.Analyzers.Tests
  • Refactoring tests: Refactorings.Tests
  • Compiler diagnostic fix tests: CodeFixes.Tests

.NET API

• The .NET API extends Roslyn and is intended for building custom analyzers and refactorings.
• These packages do not include analyzers or refactorings.
• See reference documentation.
• See "How to use Roslynator .NET API"

Package	Version	Extends
Roslynator.Core		Microsoft.CodeAnalysis.Common
Roslynator.Workspaces.Core		Microsoft.CodeAnalysis.Workspaces.Common
Roslynator.CSharp		Microsoft.CodeAnalysis.CSharp
Roslynator.CSharp.Workspaces		Microsoft.CodeAnalysis.CSharp.Workspaces