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I’m using Visual Studio 2010 to create a small WPF application. I’ve created a user control that I am now trying to add to my main form. The user control does show up in toolbox but every time I try to drag the control to the form I get the error:
The enumerator is not valid because the collection changed.
I should know what’s wrong and it is bugging me that I can’t figure it out.
In order for a user control to function properly you need to have a constructor that takes zero arguments. This way the form designer has a way to render the control in a “default” manner.
I then overloaded my constructor to take the arguments I needed to actually run the control properly and everything worked as expected.