c#和UDP SOCKET广播

server:

            Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,ProtocolType.Udp);

            IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 9050);//255.255.255.255

            IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("192.168.1.255"), 9050);

            string hostname = Dns.GetHostName();

            byte[] data = Encoding.ASCII.GetBytes(hostname);

            sock.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.Broadcast, 1);

            sock.SendTo(data, iep1);

            sock.SendTo(data, iep2);

            sock.Close();

client:

            Socket sock = new Socket(AddressFamily.InterNetwork,

            SocketType.Dgram, ProtocolType.Udp);

            IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050);

            sock.Bind(iep);

            EndPoint ep = (EndPoint)iep;

            Console.WriteLine("Ready to receive…");

            byte[] data = new byte[1024];

            int recv = sock.ReceiveFrom(data, ref ep);

            string stringData = Encoding.ASCII.GetString(data, 0, recv);

            Console.WriteLine("received: {0} from: {1}",

            stringData, ep.ToString());

            data = new byte[1024];

            recv = sock.ReceiveFrom(data, ref ep);

            stringData = Encoding.ASCII.GetString(data, 0, recv);

            Console.WriteLine("received: {0} from: {1}",

            stringData, ep.ToString());

            sock.Close();