Setting WindowStartupLocation from ResourceDictionary throws XamlParseException

Question

When I attempt to set the WindowStartupLocation property through a Setter within a ResourceDictionary, I get a XamlParseExceptio

Answer 1

The problem is that WindowStartupLocation is not a DependencyProperty so you can't set it in the style setter. Looking in ILSpy the Setter calls

CheckValidProperty(DependencyProperty property)

and throws a NullArgumentException.

As WindowStartupLocation is just a CLR property, it can't be set in this way.

Edit: To respond to the comment. You can still use a ResourceDictionary:

    
        
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