Socket.Listen Method
Places a Socket in a listening state.
Assembly: System (in System.dll)
| Exception | Condition |
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| SocketException |
An error occurred when attempting to access the socket. See the Remarks section for more information. |
| ObjectDisposedException |
The Socket has been closed. |
Listen causes a connection-oriented Socket to listen for incoming connection attempts. The backlog parameter specifies the number of incoming connections that can be queued for acceptance. To determine the maximum number of connections you can specify, retrieve the MaxConnections value. Listen does not block.
If you receive a SocketException, use the ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library for a detailed description of the error. Use Accept or BeginAccept to accept a connection from the queue.
Note
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You must call the Bind method before calling Listen, or Listen will throw a SocketException. |
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Note
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This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing. |
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The backlog parameter is limited to different values depending on the Operating System. You may specify a higher value, but the backlog will be limited based on the Operating System. |
The following code example uses Socket to listen for incoming connections.
// create the socket
Socket listenSocket = new Socket(AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp);
// bind the listening socket to the port
IPAddress hostIP = (Dns.Resolve(IPAddress.Any.ToString())).AddressList[0];
IPEndPoint ep = new IPEndPoint(hostIP, port);
listenSocket.Bind(ep);
// start listening
listenSocket.Listen(backlog);
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
http://msdn.microsoft.com/en-us/library/system.net.sockets.socketoptionname.maxconnections.aspx
does not work. Secondly on the page:
http://msdn.microsoft.com/en-us/library/system.net.sockets.socketoptionname.aspx
one can read:
MaxConnections: Not supported; will throw a SocketException if used.
- 10/21/2010
- Juliusz
