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IOCompletionCallback Delegate

Receives the error code, number of bytes, and overlapped value type when an I/O operation completes on the thread pool.

This API is not CLS-compliant. 

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)
[ComVisibleAttribute(true)]
[CLSCompliantAttribute(false)]
public delegate void IOCompletionCallback(
	uint errorCode,
	uint numBytes,
	NativeOverlapped* pOVERLAP
)

Parameters

errorCode
Type: System.UInt32

The error code.

numBytes
Type: System.UInt32

The number of bytes that are transferred.

pOVERLAP
Type: System.Threading.NativeOverlapped*

A NativeOverlapped representing an unmanaged pointer to the native overlapped value type.

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1
  • SecurityCriticalAttribute 

    Requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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