C# and Razor compiler playground in the browser via Blazor WebAssembly.

C#	Razor

• Razor/CSHTML to generated C# code / IR / Syntax Tree / Errors.
• C# to IL / Syntax / decompiled-C# / Errors / Execution console output.
• Any Roslyn/Razor compiler version (NuGet official builds or CI builds given PR number / branch / build number).
• Offline support (PWA).
• VSCode Monaco Editor.
• Multiple input sources (especially useful for interlinked Razor components).
• C# Language Services (completions, live diagnostics) - experimental.
• Configuring any C# parse options (e.g., LangVersion, Features).

The recommended startup app for development is src/Server.

To hit breakpoints, it is recommended to turn off the worker (in app settings).

• src/App: the WebAssembly app.
  • cd src/App; dotnet watch - src/Server is better for development though.
• src/Compiler: self-contained project referencing Roslyn/Razor. It's reloaded at runtime with a user-chosen version of Roslyn/Razor. It should be small (for best reloading perf). It can reference shared code which does not depend on Roslyn/Razor from elsewhere (e.g., Shared.csproj).
• src/RazorAccess: internal access to Razor DLLs (via fake assembly name).
• src/RoslynAccess: internal access to Roslyn DLLs (via fake assembly name).
• src/Server: a Blazor Server entrypoint for easier development of the App (it has better tooling support for hot reload and debugging).
  • cd src/Server; dotnet watch
• src/Shared: code used by Compiler that does not depend on Roslyn/Razor.
• src/Worker: an app loaded in a web worker (a separate process in the browser), so it does all the CPU-intensive work to avoid lagging the user interface.
• test/UnitTests
  • dotnet test

• Logo: OpenMoji
• Style: Bootstrap
• Icons: Bootstrap Icons

Razor REPLs:

• https://blazorrepl.telerik.com/
• https://netcorerepl.telerik.com/
• https://try.mudblazor.com/snippet
• https://blazorfiddle.com/

C# REPLs:

• https://dotnetfiddle.net/
• https://onecompiler.com/csharp

C# compiler playgrounds:

• https://sharplab.io/
• https://godbolt.org/

XAML REPLs:

• https://playground.platform.uno/