Changing the month of a DatePicker throws this exception:
System.Windows.Automation.ElementNotAvailableException: 'Element does not exist or it is virtualized; use VirtualizedItem Pattern if it is supported.'
The Stack Trace:
at MS.Internal.Automation.ElementUtil.Invoke(AutomationPeer peer, DispatcherOperationCallback work, Object arg) at MS.Internal.Automation.ElementProxy.GetPropertyValue(Int32 property)
I created a simple project with only one DatePicker on the main window and it gives the same exception.
<DatePicker x:Name="datePicker1" Width="150" /> .NET Framework version: 4.6
I found the same problem in a 6 years old question, but no answer till now!
Edit:
I tried different .NET Framework versions: 4.5, 4.6.1, and the problem still the same.
5 Answers
Answers 1
If you look on the microsoft documentation it says:
This exception can be raised if the element was in a dialog box that was closed, or an application that was closed or terminated.
Could it be possible that you're closing the window on a "change month" event?
Answers 2
It is difficult to reproduce your issue. The next suggestions may help you:
another process may affect to your program. Do you use utilities like
SnooporUISpy?your problem may be related to low-performance hardware or vendor software bug. See here answer for resolving this issue
your problem may be related to rendering a copy of UI-control which doesn't exist for some reasons. See this discussion for more details
Answers 3
The exception appears to depend on the Tablet PC Input Service being enabled. If I had to guess, the error occurs in UI Automation code that only runs when pen-based input is available (and possibly touch-based input). I've seen that service induce undesirable side effects in WPF applications before, and most of those issues were also related to UI Automation.
Since this appears to be a "first chance" exception (it gets handled somewhere in the framework), the only people should notice are developers who have their IDE configured to break on all exceptions (as opposed to only unhandled exceptions). If that is indeed the case, and if those developers are not actually using the pen or touch input capabilities, it might be easiest to just disable the Tablet PC Input Service and move on with your lives.
Alternatively, you could configure Visual Studio to not break on that particular exception type, which only pertains to UI Automation anyway.
Since things are pretty slow at the office this week, I will spend some additional time looking into this. If I can find a code-based solution, I will update my answer here. But from the look of it, the UI is constructed almost entirely programmatically, so this probably isn't something you can fix with a simple custom template.
Answers 4
(As I needed some diversion) I tried to do some research on your case and could reproduce the mentioned exception. Enabling .NET Framework source stepping and anything else I could find I was able to pinpoint the exception to the Invoke method of the ElementUtil class in the PresentationCore.dll. The corresponding code of the method looks like this:
internal static object Invoke(AutomationPeer peer, DispatcherOperationCallback work, object arg) { Dispatcher dispatcher = peer.Dispatcher; // Null dispatcher likely means the visual is in bad shape! if( dispatcher == null ) { throw new ElementNotAvailableException(); } Exception remoteException = null; bool completed = false; object retVal = dispatcher.Invoke( DispatcherPriority.Send, TimeSpan.FromMinutes(3), (DispatcherOperationCallback) delegate(object unused) { try { return work(arg); } catch(Exception e) { remoteException = e; return null; } catch //for non-CLS Compliant exceptions { remoteException = null; return null; } finally { completed = true; } }, null); if(completed) { if(remoteException != null) { throw remoteException; } } else { bool dispatcherInShutdown = dispatcher.HasShutdownStarted; if(dispatcherInShutdown) { throw new InvalidOperationException(SR.Get(SRID.AutomationDispatcherShutdown)); } else { throw new TimeoutException(SR.Get(SRID.AutomationTimeout)); } } return retVal; } Taking this code into consideration the (in my opinion) only possible reason is, that the specified dispatcher is null. Altough I find the comment
// Null dispatcher likely means the visual is in bad shape!
funny, I have actually no idea why this is the case. I tired to debugging that fact but was unable to get any meaningful information. Only following stacktrace (which opened my eyes again about what is going on if we "just click a button"):
PresentationCore.dll!MS.Internal.Automation.ElementUtil.Invoke(System.Windows.Automation.Peers.AutomationPeer peer, System.Windows.Threading.DispatcherOperationCallback work, object arg) PresentationCore.dll!MS.Internal.Automation.ElementProxy.GetPropertyValue(int property) [Native to Managed Transition] UIAutomationCore.dll!ProviderCallouts::RawGetPropertyValue(struct IRawElementProviderSimple *,int,struct tagVARIANT *) UIAutomationCore.dll!ProviderCallouts::GetPropertyValue(struct IRawElementProviderSimple *,unsigned short,class ProviderEntryPoint *,int,struct tagVARIANT *) UIAutomationCore.dll!InProcClientAPIStub::GetPropertyValue(char *) UIAutomationCore.dll!InProcClientAPIStub::InvokeInProcAPI(struct ITargetContextInvoker *,enum Protocol_MethodId,...) UIAutomationCore.dll!AccessibleProxy::IsControl(struct IRawElementProviderFragment *,struct ITargetContextInvoker *) UIAutomationCore.dll!AccessibleProxy::NormalizeUpwards(struct IRawElementProviderFragment *,struct ITargetContextInvoker *,struct IRawElementProviderFragment * *) UIAutomationCore.dll![thunk]:EditProxy::Release`adjustor{32}' (void) UIAutomationCore.dll!_UiaReturnRawElementProvider@16() [Managed to Native Transition] UIAutomationProvider.dll!MS.Internal.Automation.UiaCoreProviderApi.UiaReturnRawElementProvider(System.IntPtr hwnd = 0x000406ce, System.IntPtr wParam = 0xffffffff, System.IntPtr lParam = 0x00000149, System.Windows.Automation.Provider.IRawElementProviderSimple el = {MS.Internal.Automation.ElementProxy}) UIAutomationProvider.dll!System.Windows.Automation.Provider.AutomationInteropProvider.ReturnRawElementProvider(System.IntPtr hwnd = 0x000406ce, System.IntPtr wParam = 0xffffffff, System.IntPtr lParam = 0x00000149, System.Windows.Automation.Provider.IRawElementProviderSimple el = {MS.Internal.Automation.ElementProxy}) PresentationCore.dll!System.Windows.Interop.HwndTarget.CriticalHandleWMGetobject(System.IntPtr wparam, System.IntPtr lparam, System.Windows.Media.Visual root, System.IntPtr handle) PresentationCore.dll!System.Windows.Interop.HwndTarget.HandleMessage(MS.Internal.Interop.WindowMessage msg, System.IntPtr wparam, System.IntPtr lparam) PresentationCore.dll!System.Windows.Interop.HwndSource.HwndTargetFilterMessage(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled = false) WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd = 0x000406ce, int msg = 0x0000003d, System.IntPtr wParam = 0xffffffff, System.IntPtr lParam = 0x00000149, ref bool handled = false) WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source = {System.Windows.Threading.Dispatcher}, System.Delegate callback, object args, int numArgs, System.Delegate catchHandler = null) WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs) WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd = 0x000406ce, int msg = 0x0000003d, System.IntPtr wParam = 0xffffffff, System.IntPtr lParam = 0x00000149) [Native to Managed Transition] user32.dll!__InternalCallWinProc@20() user32.dll!InternalCallWinProc() user32.dll!UserCallWinProcCheckWow(struct _ACTIVATION_CONTEXT *,void *,struct HWND__ *,enum _WM_VALUE,unsigned int,long,void *,int) user32.dll!_DispatchClientMessage@24() user32.dll!___fnDWORD@4() ntdll.dll!_KiUserCallbackDispatcher@12() user32.dll!_SendMessageTimeoutW@28() oleacc.dll!NativeIAccessibleFromWindow(unsigned long,unsigned long,struct HWND__ *,unsigned long,struct _GUID const &,void * *) oleacc.dll!_ORIGINAL_AccessibleObjectFromWindow@24() oleacc.dll!_AccessibleObjectFromWindow@16() oleacc.dll!_AccessibleObjectFromEvent@20() oleacc.dll!_EXTERNAL_AccessibleObjectFromEvent@20() msctf.dll!_AccessibleObjectFromEvent@20() msctf.dll!CThreadInputMgr::OnAccFocusEvent() msctf.dll!WinEventProc() user32.dll!___ClientCallWinEventProc@4() ntdll.dll!_KiUserCallbackDispatcher@12() [Managed to Native Transition] UIAutomationProvider.dll!MS.Internal.Automation.UiaCoreProviderApi.UiaRaiseAutomationEvent(System.Windows.Automation.Provider.IRawElementProviderSimple provider = {MS.Internal.Automation.ElementProxy}, int eventId = 0x00004e25) UIAutomationProvider.dll!System.Windows.Automation.Provider.AutomationInteropProvider.RaiseAutomationEvent(System.Windows.Automation.AutomationEvent eventId = {System.Windows.Automation.AutomationEvent}, System.Windows.Automation.Provider.IRawElementProviderSimple provider = {MS.Internal.Automation.ElementProxy}, System.Windows.Automation.AutomationEventArgs e = {System.Windows.Automation.AutomationEventArgs}) PresentationCore.dll!System.Windows.Automation.Peers.AutomationPeer.RaiseAutomationEvent(System.Windows.Automation.Peers.AutomationEvents eventId) PresentationCore.dll!System.Windows.Automation.Peers.AutomationPeer.RaiseFocusChangedEventHelper(System.Windows.IInputElement newFocus) PresentationCore.dll!System.Windows.Input.KeyboardDevice.ChangeFocus(System.Windows.DependencyObject focus, int timestamp) PresentationCore.dll!System.Windows.Input.KeyboardDevice.TryChangeFocus(System.Windows.DependencyObject newFocus, System.Windows.Input.IKeyboardInputProvider keyboardInputProvider, bool askOld, bool askNew, bool forceToNullIfFailed) PresentationCore.dll!System.Windows.Input.KeyboardDevice.Focus(System.Windows.DependencyObject focus, bool askOld, bool askNew, bool forceToNullIfFailed) PresentationCore.dll!System.Windows.Input.KeyboardDevice.Focus(System.Windows.IInputElement element) PresentationCore.dll!System.Windows.UIElement.Focus() PresentationFramework.dll!System.Windows.Input.KeyboardNavigation.Navigate(System.Windows.DependencyObject currentElement, System.Windows.Input.TraversalRequest request, System.Windows.Input.ModifierKeys modifierKeys, System.Windows.DependencyObject firstElement) PresentationFramework.dll!System.Windows.FrameworkElement.MoveFocus(System.Windows.Input.TraversalRequest request) PresentationFramework.dll!System.Windows.Controls.Primitives.CalendarItem.FocusDate(System.DateTime date) PresentationFramework.dll!System.Windows.Controls.Calendar.OnCalendarButtonPressed(System.Windows.Controls.Primitives.CalendarButton b, bool switchDisplayMode) PresentationFramework.dll!System.Windows.Controls.Primitives.CalendarItem.Month_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e) PresentationCore.dll!System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {System.Windows.Controls.Primitives.CalendarButton}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool reRaised = true) PresentationCore.dll!System.Windows.UIElement.ReRaiseEventAs(System.Windows.DependencyObject sender = {System.Windows.Controls.Primitives.CalendarButton}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, System.Windows.RoutedEvent newEvent) PresentationCore.dll!System.Windows.UIElement.OnMouseUpThunk(object sender, System.Windows.Input.MouseButtonEventArgs e) PresentationCore.dll!System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {System.Windows.Shapes.Rectangle}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool reRaised = false) PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender = {System.Windows.Shapes.Rectangle}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}) PresentationCore.dll!System.Windows.UIElement.RaiseTrustedEvent(System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}) PresentationCore.dll!System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs args, bool trusted) PresentationCore.dll!System.Windows.Input.InputManager.ProcessStagingArea() PresentationCore.dll!System.Windows.Input.InputManager.ProcessInput(System.Windows.Input.InputEventArgs input) PresentationCore.dll!System.Windows.Input.InputProviderSite.ReportInput(System.Windows.Input.InputReport inputReport) PresentationCore.dll!System.Windows.Interop.HwndMouseInputProvider.ReportInput(System.IntPtr hwnd, System.Windows.Input.InputMode mode, int timestamp, System.Windows.Input.RawMouseActions actions, int x, int y, int wheel) PresentationCore.dll!System.Windows.Interop.HwndMouseInputProvider.FilterMessage(System.IntPtr hwnd = 0x000406ce, MS.Internal.Interop.WindowMessage msg = WM_LBUTTONUP, System.IntPtr wParam = 0x00000000, System.IntPtr lParam = 0x005b0066, ref bool handled = false) PresentationCore.dll!System.Windows.Interop.HwndSource.InputFilterMessage(System.IntPtr hwnd = 0x000406ce, int msg = 0x00000202, System.IntPtr wParam = 0x00000000, System.IntPtr lParam = 0x005b0066, ref bool handled = false) WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd = 0x000406ce, int msg = 0x00000202, System.IntPtr wParam = 0x00000000, System.IntPtr lParam = 0x005b0066, ref bool handled = false) WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source = {System.Windows.Threading.Dispatcher}, System.Delegate callback, object args, int numArgs, System.Delegate catchHandler = null) WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs) WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd = 0x000406ce, int msg = 0x00000202, System.IntPtr wParam = 0x00000000, System.IntPtr lParam = 0x005b0066) [Native to Managed Transition] user32.dll!__InternalCallWinProc@20() user32.dll!InternalCallWinProc() user32.dll!UserCallWinProcCheckWow(struct _ACTIVATION_CONTEXT *,void *,struct HWND__ *,enum _WM_VALUE,unsigned int,long,void *,int) user32.dll!_DispatchMessageWorker@8() user32.dll!_DispatchMessageW@4() WindowsBase.ni.dll!69d4936c() [Frames below may be incorrect and/or missing, native debugger attempting to walk managed call stack] [Managed to Native Transition] WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame = {System.Windows.Threading.DispatcherFrame}) WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) PresentationFramework.dll!System.Windows.Application.Run() WpfApp1.exe!WpfApp1.App.Main() [Native to Managed Transition] mscoreei.dll!__CorExeMain@0() mscoree.dll!_ShellShim__CorExeMain@0() mscoree.dll!__CorExeMain_Exported@0() ntdll.dll!__RtlUserThreadStart() ntdll.dll!__RtlUserThreadStart@8() Just for fun here ist the same stacktrace as above in graphical form: 
So my conslusion is that...
- ...Mike Strobel's answer is the closest I've seen
- ...as of now I am curious myself
Answers 5
A possible work around would be to Try, Catch, Finally the UIAnimation exception and not raise any events (message boxes, error logs) when it occurs. Just let the code continue on as if nothing happened.
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