System.Net.Sockets - 定义超时？ （C＃）

Question

执行端口查找时是否可以设置超时，如下面的代码所示？：

    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

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 2

... FYI

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;

Answer 3

看起来这可能是您正在寻找的内容：http://www.codeproject.com/KB/IP/TimeOutSocket.aspx。

似乎他正在使用

    ManualResetEvent.WaitOne()

在超时期间阻止主线程。如果

    IsConnectionSuccessful

为假（即连接未及时或callBack失败），当时间用完时，将抛出异常。