Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

TcpListener.BeginAcceptSocket Method

Note: This method is new in the .NET Framework version 2.0.

Begins an asynchronous operation to accept an incoming connection attempt.

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

public IAsyncResult BeginAcceptSocket (
	AsyncCallback callback,
	Object state
)
public IAsyncResult BeginAcceptSocket (
	AsyncCallback callback, 
	Object state
)
public function BeginAcceptSocket (
	callback : AsyncCallback, 
	state : Object
) : IAsyncResult

Parameters

callback

An AsyncCallback delegate that references the method to invoke when the operation is complete.

state

A user-defined object containing information about the accept operation. This object is passed to the callback delegate when the operation is complete.

Return Value

An IAsyncResult that references the asynchronous creation of the Socket.

Exception typeCondition

SocketException

An error occurred while attempting to access the socket. See the Remarks section for more information.

ObjectDisposedException

The Socket has been closed.

The asynchronous BeginAcceptSocket operation must be completed by calling the EndAcceptSocket method. Typically, the method is invoked by the callback delegate.

This method does not block until the operation completes. To block until the operation completes, use the AcceptSocket method.

For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously.

NoteNote

You can call the RemoteEndPoint property of the returned Socket to identify the remote host's network address and port number.

NoteNote

If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code and refer to the Windows Sockets version 2 API error code documentation in the MSDN library at http://msdn.microsoft.com/library/ for a detailed description of the error.

NoteNote

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example demonstrates the use of the BeginAcceptSocket method to create and connect a socket. The callback delegate calls the EndAcceptSocket method to end the asynchronous request.

// Thread signal.
public static ManualResetEvent clientConnected = 
    new ManualResetEvent(false);

// Accept one client connection asynchronously.
public static void DoBeginAcceptSocket(TcpListener listener)
{
    // Set the event to nonsignaled state.
    clientConnected.Reset();

    // Start to listen for connections from a client.
    Console.WriteLine("Waiting for a connection...");

    // Accept the connection. 
    // BeginAcceptSocket() creates the accepted socket.
    listener.BeginAcceptSocket(
        new AsyncCallback(DoAcceptSocketCallback), listener);
    // Wait until a connection is made and processed before 
    // continuing.
    clientConnected.WaitOne();
}

// Process the client connection.
public static void DoAcceptSocketCallback(IAsyncResult ar) 
{
    // Get the listener that handles the client request.
    TcpListener listener = (TcpListener) ar.AsyncState;
    
    // End the operation and display the received data on the
    //console.
    Socket clientSocket = listener.EndAcceptSocket(ar);
    
    // Process the connection here. (Add the client to a 
    // server table, read data, etc.)
    Console.WriteLine("Client connected completed");

    // Signal the calling thread to continue.
    clientConnected.Set();
}

Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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.

.NET Framework

Supported in: 2.0
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

Show:
© 2014 Microsoft