Mono Documentation

Begins an asynchronous operation to accept an incoming connection request. [Edit]

public IAsyncResult BeginAccept (AsyncCallback callback, object state)

Parameters

callback
A AsyncCallback delegate, or null. [Edit]
state
An application-defined object, or null. [Edit]

Returns

A IAsyncResult instance that contains information about the asynchronous operation. [Edit]

Exceptions

Type Reason
System.Net.Sockets.SocketException
Note: For additional information on causes of the SocketException, see the System.Net.Sockets.SocketException class.
[Edit]
ObjectDisposedException The current instance has been disposed. [Edit]

Type	Reason
System.Net.Sockets.SocketException	Note: For additional information on causes of the `SocketException`, see the System.Net.Sockets.SocketException class. [Edit]
ObjectDisposedException	The current instance has been disposed. [Edit]

Remarks

To retrieve the results of the operation and release resources allocated by the Socket.BeginAccept(AsyncCallback, object) method, call the Socket.EndAccept(IAsyncResult) method, and specify the IAsyncResult object returned by this method.
Note: The Socket.EndAccept(IAsyncResult) method should be called exactly once for each call to the Socket.BeginAccept(AsyncCallback, object) method.
If the callback parameter is not null, the method referenced by callback is invoked when the asynchronous operation completes. The IAsyncResult object returned by this method is passed as the argument to the method referenced by callback. The method referenced by callback can retrieve the results of the operation by calling the Socket.EndAccept(IAsyncResult) method.
The state parameter can be any object that the caller wishes to have available for the duration of the asynchronous operation. This object is available via the IAsyncResult.AsyncState property of the object returned by this method.
To determine the connection status, check the Socket.Connected property, or use either the Socket.Poll(int, SelectMode) or Socket.Select(IList, IList, IList, int) method.
Note:
For more information, see Socket.Accept, the synchronous version of this method.
[Edit]

Example

The following excerpt from the System.Net.Sockets.Socket class overview example outlines an asynchronous accept operation.

C# Example

public class Server
{
  static void Main()
  {
    .
    .
    .
    listenSocket.BeginAccept(
      new AsyncCallback(Server.acceptCallback),
      listenSocket);
    .
    .
    .
    // EndAccept can be called here
    .
    .
    .
  }

  public static void
    acceptCallback(IAsyncResult asyncAccept)
  {
    Socket listenSocket =
      (Socket)asyncAccept.AsyncState;

    Socket serverSocket =
      listenSocket.EndAccept(asyncAccept);

    serverSocket.BeginReceive(...);
    .
    .
    .
  }
}

Requirements