IExtension(T) Interface
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IExtension<T> Interface


Enables an object to extend another object through aggregation.

Namespace:   System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

public interface IExtension<T>
where T : object, IExtensibleObject<T>

Type Parameters


The object that participates in the custom behavior.


Enables an extension object to find out when it has been aggregated. Called when the extension is added to the IExtensibleObject<T>.Extensions property.


Enables an object to find out when it is no longer aggregated. Called when an extension is removed from the IExtensibleObject<T>.Extensions property.

WCF allows you to extend System.ServiceModel.IExtensibleObject<T> objects (the System.ServiceModel.IContextChannel, System.ServiceModel.ServiceHost, System.ServiceModel.InstanceContext, and System.ServiceModel.OperationContext classes) by adding a new state or behavior by using its extensible object pattern. The extensible object pattern is used in WCF to either extend existing run-time classes with new functionality or to add new state features to an object.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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