将两个UDP客户端连接到一个端口(发送和接收)

Question

我尝试了这个问题的建议但收效甚微.

请...任何帮助将不胜感激!

这是我的代码:

static void Main(string[] args)
{

    IPEndPoint localpt = new IPEndPoint(IPAddress.Any, 6000);

    UdpClient udpServer = new UdpClient(localpt); 
    udpServer.Client.SetSocketOption(
        SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

    UdpClient udpServer2 = new UdpClient();
    udpServer2.Client.SetSocketOption(
        SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

    udpServer2.Client.Bind(localpt); // <<---------- Exception here
}

Answer 1

您必须在绑定之前设置套接字选项.

    static void Main(string[] args)
    {
        IPEndPoint localpt = new IPEndPoint(IPAddress.Any, 6000);

        UdpClient udpServer = new UdpClient();
        udpServer.Client.SetSocketOption(
            SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
        udpServer.Client.Bind(localpt);

        UdpClient udpServer2 = new UdpClient();
        udpServer2.Client.SetSocketOption(
            SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

        udpServer2.Client.Bind(localpt); // <<---------- No Exception here

        Console.WriteLine("Finished.");
        Console.ReadLine();
    }

或者更具说明性的例子:

    static void Main(string[] args)
    {
        IPEndPoint localpt = new IPEndPoint(IPAddress.Loopback, 6000);

        ThreadPool.QueueUserWorkItem(delegate
        {
            UdpClient udpServer = new UdpClient();
            udpServer.ExclusiveAddressUse = false;
            udpServer.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
            udpServer.Client.Bind(localpt);

            IPEndPoint inEndPoint = new IPEndPoint(IPAddress.Any, 0);
            Console.WriteLine("Listening on " + localpt + ".");
            byte[] buffer = udpServer.Receive(ref inEndPoint);
            Console.WriteLine("Receive from " + inEndPoint + " " + Encoding.ASCII.GetString(buffer) + ".");
        });

        Thread.Sleep(1000);

        UdpClient udpServer2 = new UdpClient();
        udpServer2.ExclusiveAddressUse = false;
        udpServer2.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
        udpServer2.Client.Bind(localpt);

        udpServer2.Send(new byte[] { 0x41 }, 1, localpt);

        Console.Read();
    }