In Listing 11, the abstract base class implements an interface AsyncCallback.
在清单11中,抽象类实现AsyncCallback接口。
On the client side, you define a class that implements the interface AsyncCallback.
在客户端,定义一个实现 AsyncCallback 接口的类。
Then, you use an AsyncCallback object to actually do something with the server response.
然后,使用AsyncCallback对象对服务器响应执行一些实际操作。
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