Showing posts with label XamlParseException. Show all posts
Showing posts with label XamlParseException. Show all posts

Wednesday, December 1, 2010

XAML and cryptic error message

Got the following cryptic error message when running a WPF application (a XamlParseException):
A 'Binding' cannot be used within a '<usercontrol>' collection. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.
At first glance, everything looked good.  It might have been helpful if the error told me which property it was croaking on--but I guess MS can't learn to be specific with this XAML crap.  Fortunately, a quick google search and I stumbled onto a post where they identified thier problem when they got the same error: the owner in the DependencyProperty definition was not the control the property was on--changing it fixed their problem.  A second look at my code and I found I had done the same thing (the problem with cut-and-pasting).  Changing the owner type to the correct class fixed the problem.