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.NET Core - Remove older SDKs and runtimes

Last week I talked about a bug we discovered in the latest(at the moment of writing) .NET core runtimes that caused our Razor ViewComponents no longer being rendered.

We found a workaround by explicitly setting the SDK version using a global.json file:

The global.json file above selects 6.0.300 or any later feature band or patch for 6.0 that is installed on the machine. Although this is a good workaround we wanted to avoid to have all developers update their projects.

So on the build server we tried a different approach. Our first attempt was rolling back the Visual Studio build tools but that didn’t turn out to be a good solution.

Luckily we can also uninstall a .NET Core SDK version using the .NET Uninstall Tool (dotnet-core-uninstall) . This tool is not installed out-of-the-box so you first need to download it here. After downloading it, run the MSI to install it.

Running the tool

Now that we have the uninstall tool installed, we can execute it.

First run the dotnet-core-uninstall list command to see the list of installed .NET SDKs and runtimes that can be removed with this tool.

As you can see in the screenshot above, some SDKs and runtimes are required by Visual Studio and they're displayed with a note of why it isn't recommended to uninstall them.

Now we can do a dry run to see what will happen when we do an uninstal by using the dry-run or whatif command:

If everything looks good you can finally do a real delete using the remove command:

Remark: Make sure you are running your commandline with administrator privileges.

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