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[Source] The class Form1 can be designed, but it is not the first class in the file. Visual Studio requires designers to use the document

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Posted on 4/15/2017 10:48:35 AM | | |
The frmMain class can be designed, but not the first class in the file. Visual Studio requires the designer to use the first class in the file. Move the class code to make it the first class in the file, and then try to reload the designer.
Error prompt:
The class Form1 can be designed, but it is not the first class in the file.

This is a Visual Studio designer loading error.

Cause:
Visual Studio requires the designer to use the first class in the file. Move the class code to make it the first class in the file, and then try to reload the designer.

If you want to use Visual Studio to design a class such as Form, then the Form class code must be at the top of the code file where the Form class is located.

For example:



This allows Visual Studio to load the design correctly.

The following code cannot be designed:







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