Represents the binding element that enables duplex communication between a Silverlight version 3 client and a service.
(in System.ServiceModel.PollingDuplex.dll)
Visual Basic (Declaration)
Public Class PollingDuplexBindingElement _
Inherits BindingElement
Dim instance As PollingDuplexBindingElement
public class PollingDuplexBindingElement : BindingElement
In duplex communication, either party can initiate a message exchange. As with non-duplex communication, the client can send a request to the service and receive an optional reply. But with duplex communication, the service itself can initiate communications by sending a message to the client at any time. This is useful in applications where data must be pushed to the client when it is updated on the server.
Windows Communication Foundation (WCF) supports several types of duplex bindings. The PollingDuplexBindingElement is an element of the PollingDuplexHttpBinding that is specifically intended to establish communications with clients like Silverlight 3, where traditional duplex transport protocols like TCP are not available and where the client cannot accept new incoming connections. The PollingDuplexHttpBinding is the only duplex binding available to use with Silverlight 3 clients.
System..::.Object
System.ServiceModel.Channels..::.BindingElement
System.ServiceModel.Channels..::.PollingDuplexBindingElement
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
Reference