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NetFramework only still has some useful functions. NetCore(x), NetStandard(x) or NET(x) has no functions though.
It makes us it hard to get from NetFramework, NetCore or NetStandart to NET7.
Hope all useful functions move to NET6,7,8.
Thanks in advance.
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This is a site for support, so please use the right site to requests new feature requests about a Microsoft product or report any bugs from Guidelines for posting a quality question on Microsoft Q&A
If you have feature requests about .NET, you can add feature requests in the .Net github page.
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the "Operation is not supported on this platform" error means the function was ported to .net core, but requires O/S support and was not implemented on the selected build target platform. This is most common when the platform is not windows. This is why it's a runtime error.
generally there are better cross platform solutions than the selected method.