未找到 Microsoft.NETCore.App 2.0.0 框架

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

报错内容

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

只需要在项目添加Microsoft.EntityFrameworkCore.Design的引用（NuGet 获取），然后重新打开一遍就可以了！

主要的问题是，引用不明确导致的，不是缺少框架。

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