WaitHandle that is used to wait for an asynchronous operation to complete.

获取一个值，该值指示异步操作是否同步完成。

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The method returns an IAsyncResult, which can be used to monitor completion, wait on the WaitHandle, or complete the asynchronous call.

这个方法返回一个IAsyncResult，它可以被用在监测完成，也可以等待在WaitHandel，或者完成异步调用。

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