用于垃圾收集的标记和清扫阶段的GC暂停时间基于堆上的活动对象的数量。

The time spent in GC pauses for the mark and sweep phases of a garbage collection are based on the number of live objects on the heap.

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最大的区别就在与System.Timers.Timer类是对Win32可等待定时对象的一个包装，并在工作者线程上产生一个时间片消失事件而不是在UI线程上产生一个时间标记事件。

The biggest difference is that System.Timers.Timer is a wrapper around Win32 waitable timer objects and raises an Elapsed event on a worker thread rather than a Tick event on the UI thread.

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