问题
I work on VS 2010 .net 4.0 , my app had winForm with many controls. sometime i occur very starnge designer error:
Could not find type 'Namespace.TypeName'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built. The variable 'ControlName' is either undeclared or was never assigned.
i click Ignore and Continue the control disappear from my form. if i look in designer.cs the controls are exists..
I read this : link text but it is in vs2003 and i can not sucess solve this problem..
Thanks..
回答1:
This problem can be caused in a number of ways, usually by custom controls/components that:
- Do not have a default constructor
- Depend on variables that are set at run-time (singleton instances, data sources, etc)
- Fail to compile (you can't use a control in the designer until it compiles successfully)
- Have been significantly changed/rewritten since they were added to the form
It can also happen as a result of a glitch in Visual Studio - this is much rarer, but can usually be fixed by cleaning and rebuilding your solution and/or restarting the IDE.
来源：https://stackoverflow.com/questions/4101715/winform-designer-error-open-designer