Crash with exception: An item with the same key has already been added

[Chris Boarman]

Occasionally, our application crashes shortly after the following exception is record in the log:

08/25/2011 16:00:56.140 FATAL System.ArgumentException: An item with the same key has already been added.

I will include the full stack trace below.

It seems to happen after new items are added to the observable collection that is data bound to the grid, or after properties of items in the grid change, or after a user sorts or groups the grid. I suspect (but am not sure) that the problem is that our entities displayed in the grid have an incorrect overloaded GetHashCode method - the return value of the GetHashCode method may change for a given entity while it is in the collection. We intend to fix this, but the grid should not crash when encountering this situation.

My question is, how can I trap for this type of exception in the RadGridView? I am using MVVM, and the RadGridView is declared in XAML. 

Using version 2010.3.1314.35

Thanks
Chris

08/25/2011 16:00:56.140 FATAL System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Collections.Generic.Dictionary`2..ctor(IDictionary`2 dictionary, IEqualityComparer`1 comparer)
   at Telerik.Windows.Data.Selection.InternalSelectionItemsStorage..ctor(InternalSelectionItemsStorage itemsStorage) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\Selection\InternalSelectionItemsStorage.cs:line 16
   at Telerik.Windows.Data.Selection.ItemSelectionHandler.BeginSelection() in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\Selection\ItemSelectionHandler.cs:line 571
   at Telerik.Windows.Controls.DataControl.PersistIsCurrentPropertry(RadRowItem container, Object dataItem) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\DataControl.Selection.cs:line 426
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PrepareContainerForItemOverride(DependencyObject element, Object item) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 7573
   at Telerik.Windows.Controls.GridView.BaseItemsControl.Telerik.Windows.Controls.GridView.IGeneratorHost.PrepareItemContainer(DependencyObject container, Object item) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\ItemsControl\BaseItemsControl.cs:line 336
   at Telerik.Windows.Controls.GridView.GridViewItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\ItemsControl\GridViewItemContainerGenerator.cs:line 260
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.InsertContainer(Int32 childIndex, UIElement container, Boolean isRecycled) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewVirtualizingPanel.cs:line 2067
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.AddContainerFromGenerator(Int32 childIndex, UIElement child, Boolean newlyRealized) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewVirtualizingPanel.cs:line 2114
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size constraint) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewVirtualizingPanel.cs:line 1215
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   at System.Windows.Controls.ScrollContentPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
   at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)

[Vlad]

Hi,

 Have you tried some of the recent grid versions instead? For example Q2 2011 or just released Q2 2011 SP1?

Greetings,
Vlad
the Telerik team