Your delegate can optionally raise an event that notifies clients that the asynchronous task's lifetime has ended.

委派可以选择性引发事件，以便告知用户端，非同步工作的存留期已结束。

youdao

Your delegate can optionally raise an event that notifies clients that the asynchronous task's lifetime has ended.

委派可以选择性引发事件，以便告知用户端，非同步工作的存留期已结束。

youdao