问题
1.I have Universal Windows Platform project with .net core I think.
2.I want to convert it to target .net framework.
回答1:
You can indeed build a UWP app using .NET and C#, but UWP apps includes only a subset of the types provided in the full .NET Framework for each namespace. A main difference between a UWP app and a .NET desktop application is that the former runs in a sandbox that is isolated from other processes, whereas a traditional desktop application typically runs as a full-trust process.
Please refer to the docs for more information about the missing .NET APIs in UWP. You won't be able to use these in a UWP app.
来源：https://stackoverflow.com/questions/55114854/can-i-create-uwp-project-in-net-framework-how