The asynchronous call to the server will be triggered when the validate method is called.
当验证方法被调用时，对服务器的异步调用将被触发。
At an overall level this is an asynchronous sequence, since the first attach method call goes in one direction.
从全局层次上来看，这其实是一种异步序列，因为开始的attach方法调用是朝着一个方向的。
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。
You create an instance of the class and pass it to your asynchronous service method when you make your remote call, as seen in Listing 4.
当执行远程调用时，创建类的实例并将其传递给异步服务方法，如清单4所示。
The return value of an asynchronous call can be recovered by calling the EndInvoke method.
异步调用的返回值可以通过EndInvoke方法回收。
You can use this deferred object for defining a callback method when the asynchronous call returns a response.
我们可以使用这个deferred对象来定义一个在异步调用返回响应时执行的回调函数。
An asynchronous method may also support multiple pending calls (multiple concurrent invocations), allowing your code to call it any number of times before it completes other pending operations.
异步方法可能还支持多个挂起的调用(多个并行调用)，允许您的代码在此方法完成其他挂起的操作之前调用此方法任意多次。
Requests asynchronous processing of a response to a method call on the current sink.
请求异步处理对当前接收器上的方法调用的响应。
Requests asynchronous processing of a response to a method call on the current sink.
请求异步处理对当前接收器上的方法调用的响应。
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