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SocketAsyncEventArgs.LastOperation Property

Gets the type of socket operation most recently performed with this context object.

Namespace:  System.Net.Sockets
Assembly:  System (in System.dll)

public SocketAsyncOperation LastOperation { get; }

Property Value

Type: System.Net.Sockets.SocketAsyncOperation
A System.Net.Sockets.SocketAsyncOperation instance that indicates the type of socket operation most recently performed with this context object.

This property describes the asynchronous socket operation that was most recently completed using this SocketAsyncEventArgs object. The value of this property will be SocketAsyncOperation.None until the SocketAsyncEventArgs instance is used to begin an asynchronous socket operation. The property will then be set to the type of operation being performed in the methods that take the SocketAsyncEventArgs as a parameter. This property more easily facilitates using a single completion callback delegate for multiple kinds of asynchronous socket operations.

This property remains valid in a SocketAsyncEventArgs instance until the SocketAsyncEventArgs instance is used for another asynchronous socket (xxxAsync) operation.

This property is set by all asynchronous socket (xxxAsync) methods.

Calling an asynchronous socket method (xxxAsync) on the System.Net.Sockets.Socket class sets this property value. This property is intended for use with the SocketAsyncCallback completion routine implemented by the application.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5 SP1, 3.0 SP1, 2.0 SP1

.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

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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