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POPowerShell WPF DataGrid: Exception thrown committing empty row
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  1. POPowerShell WPF DataGrid: Exception thrown committing empty row
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    copied!<p>I get exception trying to commit <em>empty</em> DataGrid row.</p> <pre><code>System.NullReferenceException: Object reference not set to an instance of an object. at MS.Internal.Data.PropertyPathWorker.DetermineWhetherDBNullIsValid() at MS.Internal.Data.PropertyPathWorker.get_IsDBNullValidForUpdate() at MS.Internal.Data.ClrBindingWorker.get_IsDBNullValidForUpdate() at System.Windows.Data.BindingExpression.ConvertProposedValue(Object value) at System.Windows.Data.BindingExpressionBase.UpdateValue() at System.Windows.Data.BindingExpression.Update(Boolean synchronous) at System.Windows.Data.BindingExpression.UpdateSource() at Microsoft.Windows.Controls.DataGridHelper.UpdateSource(FrameworkElement element, DependencyProperty dp) at Microsoft.Windows.Controls.DataGridTextColumn.CommitCellEdit(FrameworkElement editingElement) at Microsoft.Windows.Controls.DataGridColumn.CommitEdit(FrameworkElement editingElement) at Microsoft.Windows.Controls.DataGridCell.CommitEdit() at Microsoft.Windows.Controls.DataGrid.OnExecutedCommitEdit(ExecutedRoutedEventArgs e) at Microsoft.Windows.Controls.DataGrid.OnExecutedCommitEdit(Object sender, ExecutedRoutedEventArgs e) at System.Windows.Input.CommandBinding.OnExecuted(Object sender, ExecutedRoutedEventArgs e) at System.Windows.Input.CommandManager.ExecuteCommandBinding(Object sender, ExecutedRoutedEventArgs e, CommandBinding commandBinding) at System.Windows.Input.CommandManager.FindCommandBinding(CommandBindingCollection commandBindings, Object sender, RoutedEventArgs e, ICommand command, Boolean execute) at System.Windows.Input.CommandManager.FindCommandBinding(Object sender, RoutedEventArgs e, ICommand command, Boolean execute) at System.Windows.Input.CommandManager.OnExecuted(Object sender, ExecutedRoutedEventArgs e) at System.Windows.UIElement.OnExecutedThunk(Object sender, ExecutedRoutedEventArgs e) at System.Windows.Input.ExecutedRoutedEventArgs.InvokeEventHandler(Delegate genericHandler, Object target) 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.RaiseEvent(RoutedEventArgs args, Boolean trusted) at System.Windows.Input.RoutedCommand.ExecuteImpl(Object parameter, IInputElement target, Boolean userInitiated) at System.Windows.Input.RoutedCommand.Execute(Object parameter, IInputElement target) at Microsoft.Windows.Controls.DataGrid.EndEdit(RoutedCommand command, DataGridCell cellContainer, DataGridEditingUnit editingUnit, Boolean exitEditMode) at Microsoft.Windows.Controls.DataGrid.CommitEdit(DataGridEditingUnit editingUnit, Boolean exitEditingMode) at Microsoft.Windows.Controls.DataGrid.CommitAnyEdit() at Microsoft.Windows.Controls.DataGrid.OnEnterKeyDown(KeyEventArgs e) at Microsoft.Windows.Controls.DataGrid.OnKeyDown(KeyEventArgs e) at System.Windows.UIElement.OnKeyDownThunk(Object sender, KeyEventArgs e) at System.Windows.Input.KeyEventArgs.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.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.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey) at System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG&amp; msg, Boolean&amp; handled) at System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG&amp; msg, ModifierKeys modifiers) at System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param) 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) Exception calling "Run" with "1" argument(s): "Object reference not set to an instance of an object." </code></pre> <p>Steps to reproduce:</p> <ul> <li>Goto "new row"</li> <li>Press F2</li> <li>Press ENTER</li> </ul> <p>This works ok:</p> <ul> <li>Goto "new row"</li> <li>Press F2</li> <li>Press ESC</li> </ul> <p>As well as:</p> <ul> <li>Goto "new row"</li> <li>Press F2</li> <li>Type "sdfdsf"</li> <li>Press ENTER</li> </ul> <p>Sources can be found <a href="http://cid-0dba2a6e137e8a9a.skydrive.live.com/self.aspx/Public/demo%7C_001.rar" rel="nofollow noreferrer">here</a>.</p> <p>I have found two posts that seems to be related to this problem:</p> <ol> <li><a href="http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=361723" rel="nofollow noreferrer">Exception in .Net 3.5 SP1</a></li> <li><a href="https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=422093" rel="nofollow noreferrer">WPF Databinding, Class Types, No Namespace Exception</a></li> </ol> <p>Also, I tried similar code in C#, and it worked fine. </p> <p>How can I fix this issue?</p>
 

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