Ever want (or need) to know how the .NET Framework is working under the covers?

Thanks to the new “Open Source” Microsoft, viewing the framework code is easier than ever.

But what if you are not using an open source version of .NET? Use a decompiler such as ILSpy or dotPeek.

Some useful Links

• Landing point for .NET code on GitHub
• .NET Core
  • Source code shepherded by the .NET Foundation - Including .NET Core
  • .NET Core
  • ASP.NET Core
  • Roslyn Compiler
  • Entity Framework Core
• .NET Framework
  • .NET Framework (non-core) Reference (Subset of the full framework)
  • Browse and search the .NET Framework (non-core) reference
  • Identity 2.0 (Until CodePlex shuts down)

Decompile using ILSpy

If you can’t find the source code above, or just want to quickly look at the version you are using:

• Install the ILSpy extension for Visual Studio (2012-2017)
  
• Right click on an assembly and click “Open in ILSpy”