The designer cannot be shown because the document for it was never loaded. （Visual Studio）

The designer cannot be shown because the document for it was never loaded.

 查看窗体设计器报错

 

 

 查看代码是空的

 

 

 

多做代码备份。

 

REF

https://stackoverflow.com/questions/7688630/the-designer-could-not-be-shown-for-this-file-because-none-of-the-classes-within

https://www.vbforums.com/showthread.php?820907-quot-The-designer-can-not-be-shown-because-the-document-for-it-was-never-loaded-quot