AsyncCallback Delegate

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References a method to be called when a corresponding asynchronous operation completes.

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

Syntax

'Declaration
<SerializableAttribute> _
Public Delegate Sub AsyncCallback ( _
    ar As IAsyncResult _
)

[SerializableAttribute]
public delegate void AsyncCallback(
    IAsyncResult ar
)

[SerializableAttribute]
public delegate void AsyncCallback(
    IAsyncResult^ ar
)

[<SerializableAttribute>]
type AsyncCallback = 
    delegate of 
        ar:IAsyncResult -> unit

JScript does not support delegates.

Parameters

• ar
  Type: System. . :: . .IAsyncResult
  The result of the asynchronous operation.

Remarks

Use an AsyncCallback delegate to process the results of an asynchronous operation in a separate thread. The AsyncCallback delegate represents a callback method that is called when the asynchronous operation completes. The callback method takes an IAsyncResult parameter, which is subsequently used to obtain the results of the asynchronous operation.

See Also

Reference

System Namespace