COMException: OpenClipboard 失败 (异常来自 HRESULT:0x800401D0 (CLIPBRD_E_CANT_OPEN))
StackTrace:
   在 System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
   在 System.Windows.Clipboard.Flush()
   在 System.Windows.Clipboard.CriticalSetDataObject(Object data, Boolean copy)
   在 System.Windows.Clipboard.SetDataInternal(String format, Object data)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
   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)