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I have a custom control which has a property of type Collection<System.Drawing.Point>. When I use CollectionEditor to edit this property, the CollectionEditor window shows "Object does not match target type." for the "X" and "Y" properties. But if I use System.Drawing.PointF instead, there’s no failure.
Can anyone please explain why this difference occurs?
The difference between Point and PointF lies indeed with PointConverter. Why this causes a problem is quite a long story, but at the end of the day it boils down to the following:
The
System.ComponentModel.ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor)implementation inSystem.ComponentModel.Design.CollectionEditorsimply returns.CollectionEditorCollectionForm.SelectionWrapper
this.According to the MSDN page of the aforementioned method of the
ICustomTypeDescriptorinterface, an implementation shouldIf I understand it correctly, in this case the implementation contradicts the documentation.
This is based on some research of my own, so don’t take it for granted. I posted a report of this issue on Microsoft Connect, so hopefully we’ll know for sure in a few days. I’ll report back when an answer is received.