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Code analyzer for C# and VB.NET projects

Project README

Code Quality and Security for C# and VB.NET

Build Status

Product Quality Gate Coverage
Analyzer Quality Gate Coverage
Plugin Quality Gate Coverage

Static analysis of C# and VB.NET languages in SonarQube, SonarCloud and SonarLint code quality and security products. These Roslyn analyzers allow you to produce safe, reliable and maintainable code by helping you find and correct bugs, vulnerabilities and code smells in your codebase.


Useful public resources packages

Integration with SonarQube and SonarCloud

Do you have a question or feedback?

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How to contribute

There are many ways you can contribute to the sonar-dotnet project. When contributing, please respect our Code of Conduct.

Join the discussions

One of the easiest ways to contribute is to share your feedback with us (see give feedback) and also answer questions from our community forum. You can also monitor the activity on this repository (opened issues, opened PRs) to get more acquainted with what we do.

Pull Request (PR)

If you want to fix an issue, please read the Get started pages first and make sure that you follow our coding style.

Before submitting the PR, make sure all tests are passing (all checks must be green).

  • We suggest you do not pick issues with the Area: CFG label (they are difficult, can have many side effects and are less likely to be accepted).
  • We suggest you do not implement new rules unless they are already specified for C# and/or VB.NET on our rules repository.

Note: Our CI does not get automatically triggered on the PRs from external contributors. A member of our team will review the code and trigger the CI on demand by adding a comment on the PR (see Azure Pipelines Comment triggers docs):

  • /azp run Sonar.Net - It will run the full pipeline, including plugin tests and promotion

Join us

If you would like to work on this project full-time, we are hiring!

Custom Rules

To request new rules, Contact us on our Community Forum.

If you have an idea for a rule but you are not sure that everyone needs it, you can implement your own Roslyn analyzer.

Configuring Rules

SonarQube / SonarCloud and SonarLint in Connected Mode

Open the rule in SonarQube / SonarCloud, scroll down and (in case the rule has parameters), you can configure the parameters for each Quality Profile the rule is part of.

Use SonarLint Connected Mode to connect to SonarQube and SonarCloud.


The easiest way is to configure a Quality Profile in SonarCloud.

  • Create a dummy repository and analyze it in SonarCloud (it's free for open-source).
  • Configure the Quality Profile in SonarCloud for the project you created.
  • Then connect SonarLint to that project, and it will download the configuration (ruleset and SonarLint.xml files) locally and update your project based on the Quality Profile.

Standalone NuGet

Standalone NuGet packages can be configured the same way as SonarLint in connected mode. You can use SonarLint and SonarCloud to generate the ruleset and rule configuration file SonarLint.xml as described above and embed them into your project.

You can see how we do it in our own repository for SonarLint Connected mode (and you can reuse the same concept for the NuGet package):

Internal resources

Build configuration


Copyright 2014-2023 SonarSource.

Licensed under the GNU Lesser General Public License, Version 3.0

Open Source Agenda is not affiliated with "Sonar Dotnet" Project. README Source: SonarSource/sonar-dotnet

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