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11/18/2011

ChannelBase Class

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Provides the base implementation for custom channels.

Inheritance Hierarchy

System.Object
System.ServiceModel.Channels.CommunicationObject
System.ServiceModel.Channels.ChannelBase

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

Syntax

'Declaration
Public MustInherit Class ChannelBase _
    Inherits CommunicationObject _
    Implements IChannel, ICommunicationObject, IDefaultCommunicationTimeouts

public abstract class ChannelBase : CommunicationObject, 
    IChannel, ICommunicationObject, IDefaultCommunicationTimeouts

The ChannelBase type exposes the following members.

Constructors

	Name	Description
	ChannelBase	Initializes a new instance of the ChannelBase class.

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Properties

	Name	Description
	DefaultCloseTimeout	Gets the default interval of time provided for a close operation to complete. (Overrides CommunicationObject.DefaultCloseTimeout.)
	DefaultOpenTimeout	Gets the default interval of time provided for an open operation to complete. (Overrides CommunicationObject.DefaultOpenTimeout.)
	DefaultReceiveTimeout	Gets the default interval of time provided for a receive operation to complete.
	DefaultSendTimeout	Gets the default interval of time provided for a send operation to complete.
	IsDisposed	Gets a value that indicates whether the communication object has been disposed. (Inherited from CommunicationObject.)
	Manager	Gets the channel manager that is associated with the current channel.
	State	Gets a value that indicates the current state of the communication object. (Inherited from CommunicationObject.)
	ThisLock	Gets the mutually exclusive lock that protects the class instance during a state transition. (Inherited from CommunicationObject.)

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Methods

	Name	Description
	Abort	Causes a communication object to transition immediately from its current state into the closing state. (Inherited from CommunicationObject.)
	BeginClose(AsyncCallback, Object)	Begins an asynchronous operation to close a communication object. (Inherited from CommunicationObject.)
	BeginClose(TimeSpan, AsyncCallback, Object)	Begins an asynchronous operation to close a communication object with a specified timeout. (Inherited from CommunicationObject.)
	BeginOpen(AsyncCallback, Object)	Begins an asynchronous operation to close a communication object. (Inherited from CommunicationObject.)
	BeginOpen(TimeSpan, AsyncCallback, Object)	Begins an asynchronous operation to close a communication object within a specified interval of time. (Inherited from CommunicationObject.)
	Close()	Causes a communication object to transition from its current state into the closed state. (Inherited from CommunicationObject.)
	Close(TimeSpan)	Causes a communication object to transition from its current state into the closed state within a specified interval of time. (Inherited from CommunicationObject.)
	EndClose	Completes an asynchronous operation to close a communication object. (Inherited from CommunicationObject.)
	EndOpen	Completes an asynchronous operation to open a communication object. (Inherited from CommunicationObject.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Fault	Causes a communication object to transition from its current state into the faulted state. (Inherited from CommunicationObject.)
	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.)
	GetCommunicationObjectType	Gets the type of communication object. (Inherited from CommunicationObject.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetProperty<T>	Returns the typed object requested, if present, from the appropriate layer in the channel stack.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	OnAbort	When implemented in a derived class, inserts processing on a communication object after it transitions to the closing state due to the invocation of a synchronous abort operation. (Inherited from CommunicationObject.)
	OnBeginClose	When implemented in a derived class, inserts processing after a communication object transitions to the closing state due to the invocation of an asynchronous close operation. (Inherited from CommunicationObject.)
	OnBeginOpen	When implemented in a derived class, inserts processing on a communication object after it transitions to the opening state due to the invocation of an asynchronous open operation. (Inherited from CommunicationObject.)
	OnClose	When implemented in a derived class, inserts processing on a communication object after it transitions to the closing state due to the invocation of a synchronous close operation. (Inherited from CommunicationObject.)
	OnClosed	Invoked during the transition of a communication object into the closing state. (Inherited from CommunicationObject.) In Silverlight for Windows Phone, this member is overridden by OnClosed(). In XNA Framework, this member is overridden by OnClosed().
	OnClosing	Invoked during the transition of a communication object into the closing state. (Inherited from CommunicationObject.)
	OnEndClose	When implemented in a derived class, completes an asynchronous operation on the close of a communication object. (Inherited from CommunicationObject.)
	OnEndOpen	When implemented in a derived class, completes an asynchronous operation on the open of a communication object. (Inherited from CommunicationObject.)
	OnFaulted	Inserts processing on a communication object after it transitions to the faulted state due to the invocation of a synchronous fault operation. (Inherited from CommunicationObject.)
	OnOpen	When implemented in a derived class, inserts processing on a communication object after it transitions into the opening state which must complete within a specified interval of time. (Inherited from CommunicationObject.)
	OnOpened	Invoked during the transition of a communication object into the opened state. (Inherited from CommunicationObject.)
	OnOpening	Invoked during the transition of a communication object into the opening state. (Inherited from CommunicationObject.)
	Open()	Causes a communication object to transition from the created state into the opened state. (Inherited from CommunicationObject.)
	Open(TimeSpan)	Causes a communication object to transition from the created state into the opened state within a specified interval of time. (Inherited from CommunicationObject.)
	ThrowIfDisposed	Throws an exception if the communication object is disposed. (Inherited from CommunicationObject.)
	ThrowIfDisposedOrImmutable	Throws an exception if the communication object the State property is not set to the Created state. (Inherited from CommunicationObject.)
	ThrowIfDisposedOrNotOpen	Throws an exception if the communication object is not in the Opened state. (Inherited from CommunicationObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Events

	Name	Description
	Closed	Occurs when a communication object transitions into the closed state. (Inherited from CommunicationObject.)
	Closing	Occurs when a communication object transitions into the closing state. (Inherited from CommunicationObject.)
	Faulted	Occurs when a communication object transitions into the faulted state. (Inherited from CommunicationObject.)
	Opened	Occurs when a communication object transitions into the opened state. (Inherited from CommunicationObject.)
	Opening	Occurs when a communication object transitions into the opening state. (Inherited from CommunicationObject.)

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Explicit Interface Implementations

	Name	Description
	IDefaultCommunicationTimeouts.CloseTimeout	Gets the interval of time after which the close method, invoked by a communication object, times out.
	IDefaultCommunicationTimeouts.OpenTimeout	Gets the interval of time after which the open method, invoked by a communication object, times out.
	IDefaultCommunicationTimeouts.ReceiveTimeout	Gets the interval of time after which the receive method, invoked by a communication object, times out.
	IDefaultCommunicationTimeouts.SendTimeout	Gets the interval of time after which the send method, invoked by a communication object, times out.

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Remarks

The ChannelBase class provides an abstract base class implementation of the IChannel interface. It also requires that each channel be associated with a channel manager. Note that the only constructor available for creating instances of ChannelBase requires a channelManager input parameter.

State changes are managed by inheriting from the CommunicationObject implementation of the state machine.

The ChannelBase gets its default communication timeouts for the open, close, send and receive operations from the ChannelManagerBase associated with it.

The ChannelBase also manages the manager for you. In addition to exposing a reference to the manager, the base class also notifies the manager when channels are created and destroyed. But the reference to the manager is only good until the channel is destroyed.

Even if you do use the base class, you must still provide behaviors for opening and closing the channel. The default implementations of these methods do not provide useful information.

You must also make sure to override GetProperty<T> whenever you implement a channel. GetProperty<T> is an excellent way to communicate information along the channel stack without having to know what channels are below you, or what channels above you may perform queries. Define interfaces that can be queried for available information. Whenever you do not recognize the type argument for GetProperty<T>, delegate down to the next channel in the stack or return nulla null reference (Nothing in Visual Basic) if you are creating a new transport channel at the bottom of the stack.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

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.

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