Crash in ReadOnlyBehavior

[Sébastien]

Hi !
We use the ScheduleView Q2 2011 in a scenario where all appointments are recurrent, with the same configurable recurrence length. We have a crash that we can reproduce repeatedly when double-clicking in the schedule to add a couple of appointments, then changing the recurrence length. It won't necessarily do it the first time, but playing around with the control eventually yields the crash.
The exception is:

System.NullReferenceException was unhandled
  Message=Object reference not set to an instance of an object.
  Source=Telerik.Windows.Controls.ScheduleView
  StackTrace:
       at Telerik.Windows.Controls.ScheduleView.ReadOnlyBehavior.<>c__DisplayClass1.<CanEditSlot>b__0(Slot s) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Helpers\ReadOnlyBehavior.cs:line 109
       at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source, Func`2 predicate)
       at Telerik.Windows.Controls.ScheduleView.ReadOnlyBehavior.CanEditSlot(Slot slot) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Helpers\ReadOnlyBehavior.cs:line 109
       at Telerik.Windows.Controls.ScheduleView.SlotSelectionBehavior.CanEditSlot(SlotSelectionState state, Slot slot) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Selection\SlotSelectionBehavior.cs:line 76
       at Telerik.Windows.Controls.ScheduleView.SlotSelectionBehavior.GetSelectionOverride(SlotSelectionState state, Slot currentSlot) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Selection\SlotSelectionBehavior.cs:line 70
       at Telerik.Windows.Controls.ScheduleView.SlotSelectionBehavior.GetSelection(SlotSelectionState state, Slot currentSlot) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Selection\SlotSelectionBehavior.cs:line 60
       at Telerik.Windows.Controls.ScheduleViewBase.SelectArea(Point clickedPoint) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Controls\ScheduleView.Selection.cs:line 263
       at Telerik.Windows.Controls.ScheduleViewBase.ScheduleViewMouseLeftButtonDown(Object sender, MouseButtonEventArgs e) in c:\TB\101\WPF_Scrum\Release_WPF\Sources\Development\Controls\ScheduleView\ScheduleView\Controls\ScheduleView.Common.cs:line 3041
       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)
       at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
       at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
       at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
       at System.Windows.Application.RunDispatcher(Object ignore)
       at System.Windows.Application.RunInternal(Window window)
       at System.Windows.Application.Run(Window window)
       at System.Windows.Application.Run()
       at TelerikCrash.App.Main() in C:\Users\sfilion\Desktop\TelerikCrash\TelerikCrash\TelerikCrash\obj\x86\Debug\App.g.cs:line 0
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()

I have a text project that I can transmit to you if you create a bug in the issue tracker.
Thanks !

[Valeri Hristov]

Hi Sébastien,

I wasn't able to reproduce the problem, so I guess we will need your sample project. Could you open a new support ticket and send it to us?

Thanks in advance.

Best wishes,
Valeri Hristov
the Telerik team

[Sébastien]

Thanks Valeri !

I submitted the ticket here:
http://www.telerik.com/account/support-tickets/view-ticket.aspx?threadid=454389