dotnet/runtime

.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.

18,265

stars

124,165

commits

C#

primary language

Sep 11, 2026

updated

docs.microsoft.com/dotnet/core/
dotnet
hacktoberfest
help-wanted
Browse cluster: C# and .NET ecosystem

README

.NET Runtime

Build Status Help Wanted Good First Issue Discord

This repo contains the code to build the .NET runtime, libraries and shared host (dotnet) installers for all supported platforms, as well as the sources to .NET runtime and libraries.

What is .NET?

Official Starting Page: https://dotnet.microsoft.com

How can I contribute?

We welcome contributions! Many people all over the world have helped make this project better.

Reporting security issues and security bugs

Security issues and bugs should be reported privately to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. You should receive a response within 24 hours. Further information can be found in the Security TechCenter. You can also find these instructions in this repo's Security doc.

Also see info about related Microsoft .NET Bounty Program.

Filing issues

This repo should contain issues that are tied to the runtime, the class libraries and frameworks, the installation of the dotnet binary (sometimes known as the muxer) and the installation of the .NET runtime and libraries.

For other issues, please file them to their appropriate sibling repos. We have links to many of them on our new issue page.

.NET Foundation

.NET Runtime is a .NET Foundation project.

There are many .NET related projects on GitHub.

  • .NET home repo - links to 100s of .NET projects, from Microsoft and the community.
  • ASP.NET Core home - the best place to start learning about ASP.NET Core.

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.

General .NET OSS discussions: .NET Foundation Discussions

License

.NET (including the runtime repo) is licensed under the MIT license.

Contributors

(top 30 of 317)

vargaz

11,910 commits

stephentoub

10,438 commits

kumpera

4,074 commits

jkotas

3,258 commits

dotnet/runtime

.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.

18,265

stars

124,165

commits

C#

primary language

Sep 11, 2026

updated

docs.microsoft.com/dotnet/core/
dotnet
hacktoberfest
help-wanted
Browse cluster: C# and .NET ecosystem

README

.NET Runtime

Build Status Help Wanted Good First Issue Discord

This repo contains the code to build the .NET runtime, libraries and shared host (dotnet) installers for all supported platforms, as well as the sources to .NET runtime and libraries.

What is .NET?

Official Starting Page: https://dotnet.microsoft.com

How can I contribute?

We welcome contributions! Many people all over the world have helped make this project better.

Reporting security issues and security bugs

Security issues and bugs should be reported privately to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. You should receive a response within 24 hours. Further information can be found in the Security TechCenter. You can also find these instructions in this repo's Security doc.

Also see info about related Microsoft .NET Bounty Program.

Filing issues

This repo should contain issues that are tied to the runtime, the class libraries and frameworks, the installation of the dotnet binary (sometimes known as the muxer) and the installation of the .NET runtime and libraries.

For other issues, please file them to their appropriate sibling repos. We have links to many of them on our new issue page.

.NET Foundation

.NET Runtime is a .NET Foundation project.

There are many .NET related projects on GitHub.

  • .NET home repo - links to 100s of .NET projects, from Microsoft and the community.
  • ASP.NET Core home - the best place to start learning about ASP.NET Core.

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.

General .NET OSS discussions: .NET Foundation Discussions

License

.NET (including the runtime repo) is licensed under the MIT license.

Contributors

(top 30 of 317)

vargaz

11,910 commits

stephentoub

10,438 commits

kumpera

4,074 commits

jkotas

3,258 commits

Languages

C#

75.1%

C++

9.0%

IL Assembly

7.3%

C

6.8%