此為 visual studio 某一版之後產生的bug,暫時性解法如下
Start Notepad in administrator mode, and open the file (substituting Community for Professional or Enterprise depending on your version):
C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF6.Utility.CS.ttinclude
Update the following code in DynamicTextTransformation (approx line 1920) and change:
_generationEnvironment = type.GetProperty(“GenerationEnvironment”, BindingFlags.Instance | BindingFlags.NonPublic);
to
_generationEnvironment = type.GetProperty(“GenerationEnvironment”, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);