"Hugh Robinson" <hrobinsonAL@hotmail.com> wrote in message
news:uSzQvpzIEHA.3664@TK2MSFTNGP11.phx.gbl...
> I am creating my own UITypeEditor for a class EAFDataBindingsCollection.
> The type editor returns UITypeEditorEditStyle.Modal for GetEditStyle()
>
> When I invoke the type editor at design time by clicking on the ... button
> for a property of type EAFDataBindingsCollection, then the EditValue()
> function is called, but I am having problems downcasting the "value"
> argument. In the code below, the
> value is EAFDataBindingsCollection
> test returns false, yet the message box shows that "value" actually has
this
> type!
>
> This is really confusing...
> Does anyone know why?
>
> TIA
> Hugh Robinson
>
> Here's the code from my UITypeEditor class:
>
> public override object EditValue(ITypeDescriptorContext context,
> IServiceProvider provider,
> object value) {
>
> IWindowsFormsEditorService edSvc =
> (IWindowsFormsEditorService)
> provider.GetService(typeof(IWindowsFormsEditorService));
>
> if (value is EAFDataBindingsCollection) {
> // I never get here - even when value *is* of this type!
> EAFDataBindingsCollection coll = (EAFDataBindingsCollection)
> value;
> // show the form to edit the collection
> FormEAFDataBindingsCollectionEditor form =
> new FormEAFDataBindingsCollectionEditor(coll);
> if (DialogResult.OK == edSvc.ShowDialog(form)) {
> // return the updated collection;
> return form.EAFDataBindingsCollection;
> }
> } else {
> if (value == null) {
> MessageBox.Show("Value is null");
> } else {
> // This is where I actually end up
> MessageBox.Show("Value has type " + value.GetType().ToString());
> }
> }
>
> // return the value unchanged
> return value;
> }
> }
>
>