RadGridView Exception InvalidOperationException

[Greg Johnson]

I am constantly getting this exception while updates are being sent to the RadGridView:

[0003467] [AppDomain      ] 2010-07-20T13:56:26.9251125Z ERROR    Disptcher Unhandled Exception: System.InvalidOperationException: Cannot change or check the contents or Current position of the QueryableCollectionView while Refresh is being deferred.
[0003468] [AppDomain      ]    at Telerik.Windows.Data.QueryableCollectionView.VerifyRefreshNotDeferred()
[0003469] [AppDomain      ]    at Telerik.Windows.Data.QueryableCollectionView.get_Count()
[0003470] [AppDomain      ]    at Telerik.Windows.Data.DataItemCollection.get_Count()
[0003471] [AppDomain      ]    at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.EnsureIndexTree()
[0003472] [AppDomain      ]    at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size constraint)
[0003473] [AppDomain      ]    at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
[0003474] [AppDomain      ]    at System.Windows.UIElement.Measure(Size availableSize)
[0003475] [AppDomain      ]    at System.Windows.ContextLayoutManager.UpdateLayout()
[0003476] [AppDomain      ]    at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
[0003477] [AppDomain      ]    at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
[0003478] [AppDomain      ]    at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
[0003479] [AppDomain      ]    at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
[0003480] [AppDomain      ]    at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
[0003481] [AppDomain      ]    at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
[0003482] [AppDomain      ]    at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)


The exceptions become more numerous if you move the mouse over the grid while adding to the data collection, or updating fields in the collection elements. The updates are sent to the grid asynchronously from  a real time system.

[Tsvyatko]

Hi Greg Johnson,

Could you please share with us the scenario and  the code that is causing this issue. Also what version of our control are you using?

All the best,
Tsvyatko
the Telerik team