New in version 3.17.
Default value for DOTNET_TARGET_FRAMEWORK property of targets.
This variable is used to initialize the DOTNET_TARGET_FRAMEWORK property on all targets. See that target property for additional information.
Setting CMAKE_DOTNET_TARGET_FRAMEWORK may be necessary when working with C# and newer .NET framework versions to avoid referencing errors with the ALL_BUILD CMake target.
This variable is only evaluated for Visual Studio Generators VS 2010 and above.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_DOTNET_TARGET_FRAMEWORK.html