If something performs a single activity, then it really refers to a service operation.
如果执行单一活动，那么它实际上是指服务操作。
If there is a response, then get the response message context from operation client.
如果有响应，则从操作客户机获取响应消息上下文。
If the user chooses to cancel the operation, then the file is not opened.
如果用户取消操作，则不打开文件。
If the user chooses to cancel the operation, then the file is not opened.
如果用户取消操作，则不打开文件。
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