COMException: 事件無法啟動任何訂閱者 (Exception from HRESULT: 0x80040201)
StackTrace:
   於 MS.Win32.UnsafeNativeMethods.ITextStoreACPSink.OnSelectionChange()
   於 System.Windows.Documents.TextStore.OnSelectionChanged()
   於 System.Windows.Documents.TextSelection.System.Windows.Documents.ITextRange.NotifyChanged(Boolean disableScroll, Boolean skipEvents)
   於 System.Windows.Documents.TextRangeBase.EndChange(ITextRange thisRange, Boolean disableScroll, Boolean skipEvents)
   於 System.Windows.Documents.TextEditorMouse.OnMouseDown(Object sender, MouseButtonEventArgs e)
   於 System.Windows.Controls.Primitives.TextBoxBase.OnMouseDown(MouseButtonEventArgs e)
   於 System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
   於 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   於 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   於 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   於 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   於 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   於 System.Windows.Input.InputManager.ProcessStagingArea()
   於 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   於 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   於 System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   於 System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   於 System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   於 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   於 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   於 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   於 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)