C#显示不了窗体，报告这个错误，请问如何解决
C#显示不了窗体，报告这个错误，请问如何解决
The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: FrmMdiMain --- The base class 'System.Object' cannot be designed.
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at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host)
你关了VS，再打开看看，一般这样就可以了
或者你重建一下项目（build all)
确实如此。看来是BUG
还有可能是你的代码有错误，继承的时候很容易出这样的错误的！
