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RadGridView - Error when attempting to group by column...

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GridView

This is a migrated thread and some comments may be shown as answers.

Rob asked on 14 Oct 2011, 02:18 PM

After switching to the most recent telerik dll's, I have started seeing an exception when I attempt to group by a column in the RadGridView.

(EDIT)
Actually this problem isn't with grouping... it's occuring when I am dragging the column header. I am running in legacy drag and drop mode and after my "OnGridViewDropInfo" event completes, I get this error...

System.ArgumentNullException: Value cannot be null.

Parameter name: element

at Telerik.Windows.Controls.ChildrenOfTypeExtensions.<GetChildrenRecursive>d__3.MoveNext()

at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.MoveNext()

at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)

at Telerik.Windows.Controls.GridView.DragDropHelper.GetElement(Grid cue)

at Telerik.Windows.Controls.GridView.DragDropController.OnHeaderCellDragInfo(Object sender, DragDropEventArgs e)

at Telerik.Windows.Controls.DragDrop.DragDropEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)

at Telerik.Windows.RadRoutedEventArgs.InvokeHandler(Delegate handler, Object target)

at Telerik.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RadRoutedEventArgs routedEventArgs)

at Telerik.Windows.RouteItem.InvokeHandler(RadRoutedEventArgs routedEventArgs)

at Telerik.Windows.EventRoute.InvokeHandlersImpl(Object source, RadRoutedEventArgs args, Boolean raisedAgain)

at Telerik.Windows.EventRoute.InvokeHandlers(Object source, RadRoutedEventArgs args)

at Telerik.Windows.RadRoutedEventHelper.RaiseEvent(DependencyObject element, RadRoutedEventArgs args)

at Telerik.Windows.DependencyObjectExtensions.RaiseEvent(DependencyObject element, RadRoutedEventArgs e)

at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.DragDropProvider_DragInfo(Object sender, DragDropEventArgs e)

at Telerik.Windows.Controls.DragDrop.DragDropProviderBase.RaiseDragInfo()

at Telerik.Windows.Controls.DragDrop.DragDropProviderBase.NotifySource()

at Telerik.Windows.Controls.DragDrop.DragDropProviderBase.OnDropImpossible()

at Telerik.Windows.Controls.DragDrop.SimulatedDragDropProvider.OnRealDrag(IMouseEventArgs e)

at Telerik.Windows.Controls.DragDrop.SimulatedDragDropProvider.OnCoverRectangleMouseMoveInternal(IMouseEventArgs e)

at Telerik.Windows.Controls.DragDrop.SilverlightDragDropProvider.OnCoverRectangleMouseMove(Object sender, MouseEventArgs e)

at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)

at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

6 Answers, 1 is accepted

answered on 16 Nov 2011, 09:06 PM

Hi again,

I just tried this on the latest Q3 2011 build (2011.3.1116.1040) and I'm still getting the error...

The error appears to be the same:

System.ArgumentNullException: Value cannot be null.

Parameter name: element

at Telerik.Windows.Controls.ChildrenOfTypeExtensions.<GetChildrenRecursive>d__3.MoveNext()

at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.MoveNext()