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POBinding ComboBox.SelectedItem in Silverlight (more)
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  1. POBinding ComboBox.SelectedItem in Silverlight (more)
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    copied!<p>Related to my previous question: <a href="https://stackoverflow.com/questions/855519/binding-combobox-selecteditem-in-silverlight">Binding ComboBox.SelectedItem in Silverlight</a></p> <p>I have a ComboBox bound like so:</p> <pre><code>&lt;ComboBox x:Name="PART_CommentaryList" HorizontalAlignment="Left" Margin="3" ItemsSource="{Binding Path=CurrentVideo.Commentaries}" SelectedItem="{Binding Path=CurrentCommentary, Mode=TwoWay}"&gt; </code></pre> <p>Both the CurrentVideo and CurrentCommentary property change regularly. After a few times, I get this error:</p> <pre><code>Category: ManagedRuntimeError Message: System.ArgumentException: Value does not fall within the expected range. at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData) at MS.Internal.XcpImports.MethodPack(IntPtr objectPtr, String methodName, Object[] rawData) at MS.Internal.XcpImports.UIElement_TransformToVisual(UIElement element, UIElement visual) at System.Windows.UIElement.TransformToVisual(UIElement visual) at System.Windows.Controls.Primitives.Selector.IsOnCurrentPage( Int32 index, Rect&amp; itemsHostRect, Rect&amp; listBoxItemRect) at System.Windows.Controls.Primitives.Selector.ScrollIntoView( Int32 index) at System.Windows.Controls.Primitives.Selector.SetFocusedItem( Int32 index, Boolean scrollIntoView) at System.Windows.Controls.ComboBox.PrepareContainerForItemOverride( DependencyObject element, Object item) at System.Windows.Controls.ItemsControl.UpdateContainerForItem( Int32 index) at System.Windows.Controls.ItemsControl.RecreateVisualChildren() at System.Windows.Controls.ItemsControl.RecreateVisualChildren( IntPtr unmanagedObj) </code></pre> <p>This seems like a ComboBox bug to me. I can verify that CurrentVideo changes before CurrentCommentary, so the selected item should always be an item which is in the list.</p> <p>Related, I really don't want the Mode=TwoWay, because when the ItemsSource is changed, the SelectedItem is temporarily null, which gets set back in my model, which I don't actually want. But the binding doesn't work at all otherwise (which seems like another bug).</p>
 

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