error in gridviewcell.cs

[Aurélien]

Error occurs when I switch between cells with key "Tab" :
Value cannot be null.
Parameter name: source

Stack Trace

   at System.Linq.Enumerable.Cast[TResult](IEnumerable source)
   at Telerik.Windows.Controls.GridViewBoundColumnBase.GetValidationErrors(Object dataItem, String propertyName) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Columns\GridViewBoundColumnBase.cs:line 1579
   at Telerik.Windows.Controls.GridView.GridViewCell.<GetDataErrors>d__7.MoveNext() in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 709
   at Telerik.Windows.Data.EnumerableExtensions.Count(IEnumerable source) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Core\Data\Collections\EnumerableExtensions.cs:line 124
   at Telerik.Windows.Controls.GridView.GridViewCell.UpdateIsValidState() in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 603
   at Telerik.Windows.Controls.GridView.GridViewCell.UpdateValue() in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 1594
   at Telerik.Windows.Controls.GridView.GridViewCell.SetCellElement() in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 522
   at Telerik.Windows.Controls.GridView.GridViewCell.HideEditor() in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 818
   at Telerik.Windows.Controls.GridView.GridViewCell.ToggleEditor() in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 1130
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnCellEditModeChanged(GridViewCell cell, Boolean newIsInEditMode) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.Editing.cs:line 400
   at Telerik.Windows.Controls.GridView.GridViewCell.IsInEditModeChanged(DependencyObject target, DependencyPropertyChangedEventArgs e) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 1118
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at Telerik.Windows.Controls.GridView.GridViewCell.set_IsInEditMode(Boolean value) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 298
   at Telerik.Windows.Controls.GridView.GridViewCell.RaiseCellEditEndedEvent(GridViewEditAction editAction) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 1229
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PerformCellEditEnded(GridViewCell currentCell) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.Editing.cs:line 108
   at Telerik.Windows.Controls.GridView.GridViewDataControl.CommitCellEdit(GridViewCell currentCell, Boolean isLeavingRow) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.Editing.cs:line 69
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnCurrentCellInfoChanging(GridViewCellInfo oldCell, GridViewCellInfo newCell) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 841
   at Telerik.Windows.Controls.GridView.GridViewDataControl.set_CurrentCellInfo(GridViewCellInfo value) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 803
   at Telerik.Windows.Controls.GridView.GridViewDataControl.BeginEdit(GridViewCell gridViewCell, RoutedEventArgs editingEventArgs) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.Editing.cs:line 667
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnCellMouseDown(GridViewCell cell, MouseButtonEventArgs args) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\GridViewDataControl.Editing.cs:line 356
   at Telerik.Windows.Controls.GridView.GridViewCell.OnMouseLeftButtonDown(MouseButtonEventArgs e) in c:\TB\135\WPF_Scrum\Current_HotFix\Sources\Controls\GridView\GridView\GridView\Cells\GridViewCell.cs:line 418
   at System.Windows.UIElement.OnMouseLeftButtonDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

[Vera]

Hi Aurélien,

 
We have tried to reproduce the reported issue but to no avail. May I ask you to specify the controls version you use? A code-snippet or a simple project demonstrating the problem will be of much help.

All the best,
Vera
the Telerik team