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I just upgraded my visual studio 2019 to latest version 16.8.3 and suddenly I am not able to load any C# project and getting the following error for all .NET core projects:
The project file cannot be opened. Unable to locate the .NET SDK. Check that it is installed and that the version specified in global.json (if any) matches the installed version.
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As you have seen, Visual Studio 2019 installer includes . NET Core 2.1 but not . NET Core 3.
Navigate to C:\Program Files\dotnet\sdk and see if you can find folders associated with different sdk versions. If you can't find any folder there that means the sdk is not installed. In that case Install the sdk or repair it if you receive a message about it being already installed.
You can see both the SDK versions and runtime versions with the command dotnet --info . You'll also get other environmental related information, such as the operating system version and runtime identifier (RID).
Try to edit envrionment Variables.
Right click on This PC -> Properties -> Advanced System Settings -> Advanced -> Environment Variables -> System Variables
Add [install path] C:\Program Files\dotnet\ to the variable path.
Restart visual studio.
If it does not solve this problem, you can refer to this answer.
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