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I have a class with a public property for array of points 

public System.Drawing.Point[] Points { get; set; }

I want user to be able to change this property using PropertyGrid.

Problem is that PropertyGrid allows me (user) to edit existing list of points.

enter image description here But if I want to add or delete points then I need to click "..." button on the right side of the row and open Point Collection Editor. enter image description here

I just don't understand why Point Collection Editor dialog shows me "Object does not match target type". What am I doing wrong?

Marc Gravell
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walruz
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  • can I clarify? "Using struct as key in dictionary" - there doesn't seem to be a dictionary here, and you don't seem to be using anything as a key... is the real question here: "why doesn't a `Point[]` work correctly in the default winforms collection editor?" – Marc Gravell Aug 10 '18 at 11:09
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    Possible duplicate of [Can't edit Point\[\] or List at design time](https://stackoverflow.com/questions/38561197/cant-edit-point-or-listpoint-at-design-time) – DeveloperExceptionError Aug 10 '18 at 11:09
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    it looks like the existing post that @DeveloperExceptionError linked to is a perfect fit here – Marc Gravell Aug 10 '18 at 11:11

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