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📜  找不到类型或命名空间名称“系统”Visual Studio 2019 - 无论代码示例

📅  最后修改于: 2022-03-11 14:55:19.344000             🧑  作者: Mango

代码示例1
Clean your solution
Do a rebuild
Close visual studio
and re-open

That's it!