第三个参数(dueTime)让你定义一个引发初始定时器事件的时间。

The third parameter (dueTime) allows you to specify when the initial timer event should be fired.

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这个定时器类引发的定时器事件是同你的窗口应用程序的其余代码相同步的。

The timer events raised by this timer class are synchronous with respect to the rest of the code in your Windows Forms app.

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在每一个定时器事件被调用时该state对象作为一个参数传递给你的定时回调函数。

This state object is passed to your timer callback function during each timer event invocation.

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