未找到 Microsoft.NETCore.App 2.0.0 框架

The framework 'Microsoft.NETCore.App', version '2.0.0' was not found.

報錯內容

It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '2.0.0' was not found.
  - The following frameworks were found:
      3.1.18 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
      5.0.9 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

The specified framework can be found at:
  - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=2.0.0&arch=x64&rid=win10-x64

只需要在項目添加Microsoft.EntityFrameworkCore.Design的引用（NuGet 獲取），然後重新打開一遍就可以了！

主要的問題是，引用不明確導致的，不是缺少框架。

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