Begins an asynchronous operation to receive an available request.
开始用于接收可用请求的异步操作。
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。
Polling for the Status of an Asynchronous Operation.
轮询非同步作业的状态。
Polling for the Status of an Asynchronous Operation.
轮询非同步作业的状态。
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