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ChannelFactory.OnBeginOpen Method

Begins an asynchronous open operation on the inner channel factory of the current channel factory that has a state object associated with it.

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

protected override IAsyncResult OnBeginOpen (
	TimeSpan timeout,
	AsyncCallback callback,
	Object state
protected IAsyncResult OnBeginOpen (
	TimeSpan timeout, 
	AsyncCallback callback, 
	Object state
protected override function OnBeginOpen (
	timeout : TimeSpan, 
	callback : AsyncCallback, 
	state : Object
) : IAsyncResult
Not applicable.



The Timespan that specifies how long the operation has to complete before timing out.


The AsyncCallback delegate that receives the notification of the asynchronous operation completion.


An object, specified by the application, that contains state information associated with the asynchronous operation.

Return Value

The IAsyncResult that references the asynchronous operation.

This method receives notification, through a callback, of the identity of the event handler for the operation. The operation is not complete until either the asynchronous open on the inner channel factory returns or the time-out occurs.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0