如果应用程序域卸载，该计时器实例将停止激发事件。

If your application domain unloads, the timer instance will stop firing its events.

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现在，程序可以接受请求了，重新装载计时器也启动了。

At this point, the program is ready to accept requests, but the reload timer is also in operation.

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清理可能包括终止会话、取消计时器、取消回调处理程序或清理可能需要的任何数据结构。

This can include invalidating sessions, canceling timers, canceling callback handlers or cleaning up any data structures that may need it.

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