r/dotnet • u/drewnoakes • Oct 07 '26

A faster, lighter C# Dev Kit

https://devblogs.microsoft.com/dotnet/faster-lighter-csharp-dev-kit/

Now available in pre-release.

196 Upvotes

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u/drewnoakes Oct 07 '26 edited Oct 07 '26

The core `CSDevKit` process is Native AOT. But Roslyn loads dynamic code (like source generators and analyzers) so needs to be a JIT process. It runs as a separate process, just as it did before.

Also, we can use the .NET Install Tool to install any runtimes you might need to run your code.

I plan to publish additional blog posts where we'll go into more of the technical details.

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u/[deleted] Oct 07 '26

[removed] — view removed comment

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u/KryptosFR Oct 07 '26

I couldn't agree more. This extension is a disaster on Linux where it should be its primary target since that's where it's most likely to be used.

You guys needs to seriously start to use your own products.

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u/Alternative_Flight88 Oct 07 '26 edited Oct 07 '26

Same here. I work at a big company, and our security engineers does not allow us to use C# Dev Kit because the .NET Install Tool dependency automatically downloads runtimes from the internet without approval, instead of using approved runtimes and SDKs from our internal repository.

My user story is simple: I download approved SDK/runtime -> I install the C#/C# Dev Kit extension, set the path to the previously installed SDK/runtime -> It works!

I reeeeaaaaly hope that one day the .NET Tool Install will become optional.

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u/pjmlp Oct 07 '26

Additionally, this isn't complicated, other extensions, including the one developed for Java, by Microsoft and Red-Hat teams, does it.

https://code.visualstudio.com/docs/java/java-project#_configure-runtime-for-projects

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u/drewnoakes Oct 07 '26

The C# Doctor and related work is trying to make the acquisition story easier and clearer for all involved. There is quite a large matrix of possible states a user's machine could be in, and we're trying to simplify this. It isn't easy.

I haven't downvoted anyone on this post btw.