Silverlight 3 has introduced the option to bind to HTTP duplex Services which allows the application to constantly poll the service for updates simulating a duplex communication that way.
我们可以通过Silverlight3绑定到HTTPDuplex Services上，因而应用可以不断轮询服务以进行更新，这模拟了双向通讯的工作方式。
This authentication mode can be used to secure duplex message exchange patterns and requires the service to be configured with the client certificate out of band.
这个验证模式可以用来确保双向讯息交换模式的安全性，并且需要透过范围外的用户端凭证来设定服务。
Creates a duplex channel between a service and a callback instance on the client. Overrides ChannelFactory TChannel.
在服务和客户端上的回调实例之间创建双工通道。
Creates a duplex channel between a service and a callback instance on the client. Overrides ChannelFactory TChannel.
在服务和客户端上的回调实例之间创建双工通道。
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