PropertyGrid - binding error makes deleting item in collection editor slow.

Hello,

Please find attached a repro project.

I'm trying to use my own property editors.

The issue is that deleting an item from the collection editor is noticeably slow.

From what I found there is a binding error being generated (can be seen in VS output window)

System.Windows.Data Error: 17 : Cannot get 'Value' value (type 'Double') from '' (type 'ObjectWrapper`1'). BindingExpression:Path=Value; DataItem='ObjectWrapper`1' (HashCode=53605670); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String') TargetInvocationException:'System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Mindscape.WpfElements.PropertyEditing.ObjectWrapper`1.get_Value()
   --- End of inner exception stack trace ---

I also found that when I use a Converter in the editor this binding error is no longer there and the items deletion is fast but the binding does not seem to work. That is to say that changing the value in the propertygrid does not change the value in the bound object.

I tried this approach in propertygrid using MyStyle and one without any styling and in both cases we see the same behaviour.

To be short and avoid too much confusion I'll just let you look at the code for the details.

Please let me know if you have any questions.

Thanks Oscar

Hi Oscar,

Thanks for the repro project. The binding exception will be resolved in the next nightly build which makes the performance of all the cases consistent.

-Jason Fauchelle

Hi Jason,

The deletion is still slow. The binding exception is no longer there but I now getting an out of range exception (please see attached png file). It seems that this exception is slowing it down.

Thanks

Oscar

Hi Oscar,

Apologies for the trouble. Unfortunately I have not been able to find a solution to this problem.

-Jason Fauchelle