References the callback method to be called when the asynchronous operation is completed.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
Visual Basic (Declaration)
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Delegate Sub AsyncCallback ( _
ar As IAsyncResult _
)
Dim instance As New AsyncCallback(AddressOf HandlerMethod)
[SerializableAttribute]
[ComVisibleAttribute(true)]
public delegate void AsyncCallback (
IAsyncResult ar
)
[SerializableAttribute]
[ComVisibleAttribute(true)]
public delegate void AsyncCallback (
IAsyncResult^ ar
)
/** @delegate */
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public delegate void AsyncCallback (
IAsyncResult ar
)
JScript supports the use of delegates, but not the declaration of new ones.
Parameters
- ar
The result of the asynchronous operation.
Remarks
AsyncCallback provides a way for client applications to complete an asynchronous operation. This callback delegate is supplied to the client when the asynchronous operation is initiated. The event handler referenced by AsyncCallback contains program logic to finish processing the asynchronous task for the client.
AsyncCallback uses the IAsyncResult interface to obtain the status of the asynchronous operation.
Platforms
Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
Version Information
.NET Framework
Supported in: 2.0, 1.1, 1.0
.NET Compact Framework
Supported in: 2.0, 1.0
See Also