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Jan Jones

@janjones.me

83 followers 24 following 21 posts

C# (Roslyn) compiler dev at Microsoft github.com/jjonescz

Posts Replies Media

Jan Jones @janjones.me · 28/02/2026

Bound trees (internal Roslyn representation of executable code) can now be displayed on .NET Lab. This includes ref safety escape scopes. Makes investigation of compiler bugs easier. #dotnet #csharp #roslyn #dotnetlab

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Jan Jones @janjones.me · 22/12/2025

.NET Lab can now display disassembled machine code. It's taken directly from JIT, hence only supported on desktop for now. #dotnet #csharp #roslyn #asm #dotnetlab

Screenshot of .NET Lab with disassembled machine code

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Jan Jones @janjones.me · 17/12/2025

Tired of waiting for the WebAssembly version of .NET Lab to load? There is now .NET Lab Desktop for Windows which is much faster thanks to running on full .NET: apps.microsoft.com/detail/9PCPM... ⚡

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Jan Jones @janjones.me · 05/10/2025

Fully revamped the tree view 🌳 in .NET Lab. Now with cursor syncing. Can display syntax, IOperation, and symbol info. #dotnet #csharp #roslyn #dotnetlab

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Jan Jones @janjones.me · 06/09/2025

Added a small but useful feature to copy the current URL in .NET Lab (lab.razor.fyi). It has a keyboard shortcut too: Ctrl+; 📋 #dotnet #csharp #roslyn #dotnetlab

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Jan Jones @janjones.me · 26/07/2025

.NET Lab (lab.razor.fyi) just gained new configuration options inspired by `dotnet run app.cs`. Reference any NuGet packages via `#:package` or quickly change config via `#:property` (with editor suggestions to guide you). 🚀⚙️

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Jan Jones @janjones.me · 28/06/2025

.NET Lab (lab.razor.fyi) now has Code Actions 🚀 Very useful when you paste some code snippet and want to add missing usings. But it can do much more - all Roslyn code fixes are included.

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Jan Jones @janjones.me · 22/06/2025

Added semantic highlighting to .NET Lab (lab.razor.fyi)

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Jan Jones @janjones.me · 16/05/2025

Completions and live diagnostics are now much improved and enabled by default in .NET Lab (lab.razor.fyi). Stay tuned for more enhancements to the editing experience coming soon.

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Jan Jones @janjones.me · 02/03/2025

Shared lab.razor.fyi snippets are now cached, so you can see the output even before the compiler is initialized. (Nevertheless, more optimizations of loading times are coming.) Example: lab.razor.fyi#47Lm4gooyk8v...

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Jan Jones @janjones.me · 21/02/2025

Added this cool loading animation to lab.razor.fyi. Suddenly the loading feels faster ⚡

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Jan Jones @janjones.me · 20/12/2024

Old version using Bootstrap

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Jan Jones @janjones.me · 20/12/2024

Updated lab.razor.fyi to use Microsoft Fluent UI. Quite happy with the result. Also got dark mode for free.

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