Exception - first letter caps

[Koren]

I have a masked text input box that I am using in the edit template of a data form.  I have been getting odd exceptions when I try to update the text in this box.  I finally figured out that if I go to the textbox and start with a capital (i.e. shift+alpha key), I get the exception.  If I start typing in the textbox with a lower case alpha character or click the mouse in the box again, I have no problem.

Here is the textbox definition along with the stackpanel for that item:

<StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="1" Margin="0,0,0,5">
                                    <TextBlock Text="Description" Margin="0,0,0,0" VerticalAlignment="Center" Width="{StaticResource LabelWidth}" Style="{StaticResource LabelBoldStyle}" />
                                    <telerikInput:RadMaskedTextInput x:Name="txtDescription" Mask="" Width="{StaticResource LargeLabelWidth}"
                                                                    SpinMode="None" IsClearButtonVisible="False" SelectionOnFocus="SelectAll"
                                                                    TextMode="PlainText" InputBehavior="Replace" SectionsNavigationMode="None"
                                                                    Value="{Binding Description, Mode=TwoWay}" UpdateValueEvent="LostFocus"
                                                                    >
                                    </telerikInput:RadMaskedTextInput>
                                </StackPanel>

Here is the exception that I get:

System.IndexOutOfRangeException was unhandled by user code

  Message=Index was outside the bounds of the array.

  Source=mscorlib

  StackTrace:

       at System.Text.StringBuilder.get_Chars(Int32 index)

       at Telerik.Windows.Controls.RadMaskedInputBase.ClearString(String text, Int32 start, Int32 end, Boolean clearPlaceholders) in c:\TB\105\WPF_Scrum\Current_HotFix\Sources\Controls\Input\MaskedInput\RadMaskedInputBase.cs:line 2847

       at Telerik.Windows.Controls.RadMaskedInputBase.ClearString(String str, Boolean clearPlaceholders) in c:\TB\105\WPF_Scrum\Current_HotFix\Sources\Controls\Input\MaskedInput\RadMaskedInputBase.cs:line 2833

       at Telerik.Windows.Controls.RadMaskedInputBase.CoerceDisplayText() in c:\TB\105\WPF_Scrum\Current_HotFix\Sources\Controls\Input\MaskedInput\RadMaskedInputBase.cs:line 2431

       at Telerik.Windows.Controls.RadMaskedInputBase.CoerceValue(UpdateValueEvent updateEvent) in c:\TB\105\WPF_Scrum\Current_HotFix\Sources\Controls\Input\MaskedInput\RadMaskedInputBase.cs:line 2419

       at Telerik.Windows.Controls.RadMaskedInputBase.OnKeyDownHandled(Char c) in c:\TB\105\WPF_Scrum\Current_HotFix\Sources\Controls\Input\MaskedInput\RadMaskedInputBase.cs:line 502

       at Telerik.Windows.Controls.MaskedInput.PreviewInputTextBox.OnTextInput(TextCompositionEventArgs e) in c:\TB\105\WPF_Scrum\Current_HotFix\Sources\Controls\Input\MaskedInput\PreviewInputTextBox.cs:line 55

       at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)

       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.Input.InputManager.ProcessStagingArea()

       at System.Windows.Input.TextCompositionManager.UnsafeCompleteComposition(TextComposition composition)

       at System.Windows.Input.TextCompositionManager.PostProcessInput(Object sender, ProcessInputEventArgs e)

       at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)

       at System.Windows.Input.InputManager.ProcessStagingArea()

       at System.Windows.Input.TextCompositionManager.UnsafeStartComposition(TextComposition composition)

       at System.Windows.Input.TextCompositionManager.PostProcessInput(Object sender, ProcessInputEventArgs e)

       at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)

       at System.Windows.Input.InputManager.ProcessStagingArea()

       at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)

       at System.Windows.Interop.HwndKeyboardInputProvider.ProcessTextInputAction(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

       at System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)

       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)

  InnerException:

[Tina Stancheva]

Hi Koren,

Thank you for reporting this issue. It seems to be related to the no-mask functionality and the TextMode setting - if you remove the TextMode setting (or define the TextMode=MaskedText), the exception isn't raised. So if you don't really need the PlainText TextMode, you can remove it from the definition of the control as a workaround.

In any case, this is a bug and this is why I logged it in our PITS where you can track its progress. I also updated your Telerik account accordingly.

All the best,
Tina Stancheva
the Telerik team