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)

[SerializableAttribute]
public delegate void AsyncCallback(
	IAsyncResult ar
)

Parameters

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

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.

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