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                                            ttt-wqy

System.ArgumentNullException:“值不能为 null。 Arg_ParamName_Name”

运行时打开c#窗体点击打开文件时报错 ![image](https://user-images.githubusercontent.com/75556544/101274441-0d917700-37d9-11eb-8c1d-5b402defb88b.png) ![image](https://user-images.githubusercontent.com/75556544/101274464-3dd91580-37d9-11eb-8932-7431644d32a8.png)