dnlab

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About this app

Disclaimer: this is not an official Microsoft product.

Also known as ".NET Lab."

For more details, see https://github.com/jjonescz/DotNetLab.

Features:
- Razor/CSHTML to generated C# code / IR / Syntax Tree / Errors.
- C# to IL / Syntax / IOperation / Symbols / decompiled-C# / JIT Asm / Errors / Execution console output.
- Any Roslyn/Razor compiler version (NuGet official builds or CI builds given PR number / branch / build number).
- VSCode Monaco Editor.
- Multiple input sources (especially useful for interlinked Razor components).
- C# Language Services (completions, live diagnostics, code fixes).
- Configuring any C# options (e.g., LangVersion, Features, OptimizationLevel, AllowUnsafe) via Roslyn C# APIs or via #:property directives (both with editor completions).
- Referencing NuGet packages via #:package directives.
C# and Razor compiler playground. Unofficial tool for .NET developers.
Updated on
Aug 16, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
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What’s new

v1.24.3: update to .NET 11 preview 7

- Update to .NET 11 preview 7
- Fix broken language services

For more details and previous releases, see https://github.com/jjonescz/DotNetLab/releases