System.Net.Sockets -定义超时？(C#)

Question

是否可以在执行端口查找时设置超时，如以下代码所示：

    try
    {
        System.Net.Sockets.Socket sock = new System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
        sock.Connect(ipa, portno1);
        if (sock.Connected == true) // Port is in use and connection is successful
        {
            displayGreen1();
        }
        sock.Close();

    }

Answer 1

看起来这可能就是你要找的：http://www.codeproject.com/KB/IP/TimeOutSocket.aspx。

看起来他在利用

    ManualResetEvent.WaitOne()

在超时期间阻塞主线程。如果

    IsConnectionSuccessful

为false (即连接未及时建立或callBack失败)，则会在超时时抛出异常。

Answer 2

使用取自here的代码

Socket socket = new Socket(
    AddressFamily.InterNetwork, 
    SocketType.Stream, 
    ProtocolType.Tcp);

// Connect using a timeout (5 seconds)
IAsyncResult result = socket.BeginConnect(sIP, iPort, null, null);
bool success = result.AsyncWaitHandle.WaitOne(5000, true);
if (!_socket.Connected)
{
    // NOTE, MUST CLOSE THE SOCKET
    socket.Close();
    throw new ApplicationException("Failed to connect server.");
}

Answer 3

仅供参考。

Socket tcpSocket;

// Set the receive buffer size to 8k
tcpSocket.ReceiveBufferSize = 8192;

// Set the timeout for synchronous receive methods to 
// 1 second (1000 milliseconds.)
tcpSocket.ReceiveTimeout = 1000;

// Set the send buffer size to 8k.
tcpSocket.SendBufferSize = 8192;

// Set the timeout for synchronous send methods
// to 1 second (1000 milliseconds.)            
tcpSocket.SendTimeout = 1000;