PollingDuplexBindingElement Class
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Represents the binding element that enables duplex communication between a Silverlight 5 client and a service.
Inheritance Hierarchy
System.Object
System.ServiceModel.Channels.BindingElement
System.ServiceModel.Channels.PollingDuplexBindingElement
Namespace: System.ServiceModel.Channels
Assembly: System.ServiceModel.PollingDuplex (in System.ServiceModel.PollingDuplex.dll)
Syntax
'Declaration
Public Class PollingDuplexBindingElement _
Inherits BindingElement
public class PollingDuplexBindingElement : BindingElement
The PollingDuplexBindingElement type exposes the following members.
Constructors
| Name | Description | |
|---|---|---|
.gif "Public method") |
PollingDuplexBindingElement() | Initializes a new instance of the PollingDuplexBindingElement class. |
.gif "Protected method") |
PollingDuplexBindingElement(PollingDuplexBindingElement) | Initializes a new instance of the PollingDuplexBindingElement class from an existing one. |
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PollingDuplexBindingElement(PollingDuplexMode) | Initializes a new instance of the PollingDuplexBindingElement class with a specified polling duplex mode. |
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Properties
| Name | Description | |
|---|---|---|
.gif "Public property") |
ClientPollTimeout | The interval of time that a client polling request has to complete before timing out. |
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DuplexMode | Gets or sets a value that specifies how the server behaves in response to client polling when the communication is configured for duplex polling. |
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InactivityTimeout | Gets or sets the maximum interval of time that can pass without activity on a channel before the client channel enters a faulted state. |
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MaxPendingMessagesPerSession | Gets or sets the maximum number of pending messages per session. |
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Methods
| Name | Description | |
|---|---|---|
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BuildChannelFactory<TChannel> | Creates a channel factory that can be used to create a channel. (Overrides BindingElement.BuildChannelFactory<TChannel>(BindingContext).) |
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CanBuildChannelFactory<TChannel> | Determines whether a channel factory of the specified type can be built. (Overrides BindingElement.CanBuildChannelFactory<TChannel>(BindingContext).) |
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Clone | Creates a copy of the current binding element. (Overrides BindingElement.Clone().) |
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Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetProperty<T> | Gets a property from the specified BindingContext. (Overrides BindingElement.GetProperty<T>(BindingContext).) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
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Remarks
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 5, 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 5 clients.
Version Information
Silverlight
Supported in: 5, 4, 3
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.