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Written by Keith Wagner :csharp: on 2024-12-13 at 13:56

Hey #dotnet developers, how do you uninstall the .NET 9 SDK. It’s causing compatibility issues with one of my projects and I can’t seem to uninstall it without breaking Visual Studio and Rider.

As an FYI, I still have .NET 6 and 8 installed, so I would figure they should fall back to that.

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Written by Andy on 2024-12-13 at 14:10

@kpwags have you tried creating a global json for your project? That should control which SDK version is used for the project. https://learn.microsoft.com/en-us/dotnet/core/tools/global-json

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Written by simendsjo on 2024-12-13 at 14:23

@adeese @kpwags Andys workaround should work. The issue (on Windows at least) is that the dotnet executable will be replaced with the latest version you install. But dotnet.dll and hostfxr.dll still exist for all installed versions, so the global.json approach should be able to use the correct version (for most parts).

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Written by Keith Wagner :csharp: on 2024-12-13 at 14:34

@simendsjo The global.json approach worked for the CLI, but it’s still broken for VS and Rider

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Written by simendsjo on 2024-12-13 at 14:40

@kpwags For Rider, you can point it to the dotnet.dll in a specific dll instead of the "latest dotnet.exe" which is the default. E.g. like the following image

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Written by Keith Wagner :csharp: on 2024-12-13 at 14:45

@simendsjo That then unloads all the projects in the solution and fails to load them saying the Microsoft.NET.Sdk.Web could not be found

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Written by simendsjo on 2024-12-13 at 14:49

@kpwags You're setting the path to an net8 dotnet.dll and your project has TargetFramework net8.0? Sounds like it's trying to load a version it cannot find. I haven't needed to manipulate Rider like this before, only used the latest + global.json.

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Written by Keith Wagner :csharp: on 2024-12-13 at 14:51

@simendsjo Yup, I suspect I’m doing things that aren’t meant to be done. Just wish it was easier to remove .NET 9.

I have a workaround to allow it to work with .NET 9, but it will force the rest of my team to update their machines, and possibly our pipelines as well. I’m trying to avoid that.

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Written by Joel Bennett on 2024-12-13 at 15:44

@kpwags After you uninstall 9, did you reinstall 8?

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Written by Keith Wagner :csharp: on 2024-12-13 at 14:33

@adeese That worked for the CLI, but it didn’t work for VS or Rider

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Written by Khalid Pro Max⚡️ on 2024-12-13 at 15:27

@kpwags @adeese Rider should pick up the global.json file. Make sure it is at the root of your solution. Right-click the solution and choose "Manage SDK" at the bottom.

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Written by Keith Wagner :csharp: on 2024-12-13 at 16:36

@khalidabuhakmeh @adeese That actually got it to work.

Thanks so much, I really appreciate it

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Written by Khalid Pro Max⚡️ on 2024-12-13 at 16:48

@kpwags @adeese Awesome! Yeah, the global.json file is finicky. I joke that it's the cause of and solution to all your #dotnet problems.

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Written by Derek Price on 2024-12-13 at 15:10

@kpwags Maybe @khalidabuhakmeh has some ideas for #Rider

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Written by Khalid Pro Max⚡️ on 2024-12-13 at 15:25

@dprice @kpwags I would recommend deleting your dotnet install directory and reinstall the SDKs again. Run a dotnet --list-sdks command and it will tell you where the SDKS are installed. You could try just deleting the .NET 9 one first.

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