Unfortunately, the object raising the events cannot know ahead of time which event handler is handling a specific event.

遗憾的是，引发事件的对象无法提前知道哪个事件处理程序正在处理特定事件。

youdao

Unfortunately, the object raising the events cannot know ahead of time which event handler is handling a specific event.

遗憾的是，引发事件的对象无法提前知道哪个事件处理程序正在处理特定事件。

youdao