Hundreds of InvalidCastExceptions to type 'Telerik.Windows.Data.IGroup'

2 posts, 0 answers
  1. Russell
    Russell avatar
    9 posts
    Member since:
    Mar 2015

    Posted 28 May 2015 Link to this post

    Hi there,

     

    I have a Grid which is bound to an ObservableCollection<Record>.  This grid is using a custom GroupHeaderTemplate.  When I open the screen containing the grid whilst running with a VS2013 debugger attached, I see lots of exceptions being reported in the output window.  It also takes a long time (1-2 mins) to display the grid that used to display in a few seconds.  This exception is obviously happening on a background thread or being caught somewhere as it doesn't ever get displayed to the user or cause the application to crash.  I can turn on exception breaks in VS2013 when the exception is thrown and I can see details about it, but nothing that would point to a fix.  It appears to be happening as part of a layout pass.  The exception is...

     

    System.InvalidCastException

    Unable to cast object of type 'MyNamespace.Record' to type 'Telerik.Windows.Data.IGroup'.

    CallStack:

        Telerik.Windows.Data.dll!Telerik.Windows.Data.FuncExtensions.ToUntypedFunc<Telerik.Windows.Data.IGroup,object>.AnonymousMethod__0(object item)    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.KeyedCollection.GetKeyByItem(object value)    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.KeyedCollection.AddRange(System.Collections.IEnumerable items)    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.PopulateInternalList(System.Linq.IQueryable view)    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.CreateInternalList()    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.EnsureInternalList()    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.InternalList.get()    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.EnsureRootGroup()    Unknown
         Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.RootQCVGGroup.get()    Unknown
         Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.Rows.CalculateRowCount()    Unknown
         Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.CalculateAllRowsCount()    Unknown
         Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.EnsureIndexStorage()    Unknown
         Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.MeasureOverride(System.Windows.Size availableSize)    Unknown
         Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(System.Windows.Size availableSize)    Unknown
         PresentationFramework.dll!System.Windows.FrameworkElement.MeasureCore(System.Windows.Size availableSize)    Unknown
         PresentationCore.dll!System.Windows.UIElement.Measure(System.Windows.Size availableSize)    Unknown
         PresentationCore.dll!System.Windows.ContextLayoutManager.UpdateLayout()    Unknown
         PresentationCore.dll!System.Windows.ContextLayoutManager.UpdateLayoutCallback(object arg)    Unknown
         PresentationCore.dll!System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()    Unknown
         PresentationCore.dll!System.Windows.Media.MediaContext.RenderMessageHandlerCore(object resizedCompositionTarget)    Unknown
         PresentationCore.dll!System.Windows.Media.MediaContext.RenderMessageHandler(object resizedCompositionTarget)    Unknown
         WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs)    Unknown
         WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source, System.Delegate method, object args, int numArgs, System.Delegate catchHandler)    Unknown
         WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeImpl()    Unknown
         mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)    Unknown
         mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)    Unknown
         mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state)    Unknown
         WindowsBase.dll!System.Windows.Threading.DispatcherOperation.Invoke()    Unknown
         WindowsBase.dll!System.Windows.Threading.Dispatcher.ProcessQueue()    Unknown
         WindowsBase.dll!System.Windows.Threading.Dispatcher.WndProcHook(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled)    Unknown
         WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled)    Unknown
         WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o)    Unknown
         WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs)    Unknown
         WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source, System.Delegate method, object args, int numArgs, System.Delegate catchHandler)    Unknown
         WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs)    Unknown
         WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam)    Unknown
         [Native to Managed Transition]    
         [Managed to Native Transition]    
         WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame)    Unknown
         PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window)    Unknown
         PresentationFramework.dll!System.Windows.Application.Run()    Unknown
         MyApplication.dll!MyApplication.MyApplicationView.Start() Line 57    C#
         MyApplication.dll!MyApplication.Modularity.MyBootstrapper.Run() Line 249    C#
         MyHost.exe!MyHost.MyStartup.Main() Line 63    C#

    I'm running .Net 4.5 and Telerik 2015.1 noxaml binaries.

    Any idea what could be causing this and if there's a simple fix?

    Thanks

    Russell

  2. Dimitrina
    Admin
    Dimitrina avatar
    3769 posts

    Posted 29 May 2015 Link to this post

    Hi Russell,

    As it turns out we are not aware of such an issue and I am also not able to reproduce it at our end with the latest binaries. Would you confirm you are using the latest version? What is the result if you remove the custom GroupHeaderTemplate?
    Would you share some more information like how is RadGridView defined? Have you configured GroupRenderMode="Flat"?

    Regards,
    Dimitrina
    Telerik
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