def on_message_box_closed(result):     if result == MessageBoxResult.Yes:         # 点击是         pass     elif result == MessageBoxResult.No:         # 点击否         pass     elif result == MessageBoxResult.Cancel:         # 取消         pass      this.View.ShowMessage(str(result))       def show_message(e):     this.View.ShowMessage("错误提示，是否继续？", MessageBoxOptions.YesNoCancel,on_message_box_closed)

                         def on_message_box_closed(result):                             if result == MessageBoxResult.Yes:                                 # 点击是                                 this.View.ShowMessage("您点击了'是'")                             elif result == MessageBoxResult.No:                                 # 点击否                                 this.View.ShowMessage("您点击了'否'")                             elif result == MessageBoxResult.Cancel:                                 # 取消                                 this.View.ShowMessage("您点击了'取消'")                         this.View.ShowMessage("错误提示，是否继续？", MessageBoxOptions.YesNoCancel,on_message_box_closed)