Win32Exception: 无效监视器句柄。
--NativeErrorCode: 1461
StackTrace:
   在 System.Windows.Controls.Primitives.Popup.GetScreenBounds(Rect boundingBox, Point p)
   在 System.Windows.Controls.Primitives.Popup.GetPopupRootLimits(Rect& targetBounds, Rect& screenBounds, Size& limitSize)
   在 System.Windows.Controls.Primitives.Popup.RestrictSize(Size desiredSize)
   在 System.Windows.Controls.Primitives.PopupRoot.GetPopupSizeRestrictions(Popup popup, Size desiredSize, Boolean& restrictWidth, Boolean& restrictHeight)
   在 System.Windows.Controls.Primitives.PopupRoot.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.ContextLayoutManager.UpdateLayout()
   在 System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   在 System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   在 System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   在 System.Windows.Media.MediaContext.AnimatedRenderMessageHandler(Object resizedCompositionTarget)
   在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)