http://www.cnblogs.com/wpfworld/category/530339.html
http://www.cnblogs.com/wpfworld/p/3409402.html
参考理解下这个吧
服务器端可以拿到客户端的回调实例，通过网络通信，实现服务的回调
http://www.cnblogs.com/wpfworld/p/3409402.html
参考理解下这个吧
服务器端可以拿到客户端的回调实例，通过网络通信，实现服务的回调
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一下来自:
What You Need To Know About One-Way Calls, Callbacks, And Events
http://msdn.microsoft.com/en-us/magazine/cc163537.aspxThe client also has to facilitate hosting the callback object. Not all bindings support callback operations. Because of its connectionless nature, HTTP can't be used for callbacks and therefore you can't use callbacks over BasicHttpBinding or WSHttpBinding. Windows Communication Foundation offers callback support for NetTcpBinding and NetNamedPipeBinding because the underlying transport is bidirectional. To support callbacks over HTTP, Windows Communication Foundation provides WSDualHttpBinding, which actually sets up two HTTP channels: one for the calls from the client to the service and one for the calls from the service to the client.