非常簡單的UDP通信程序,C#

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class UDPListener
{
private const int listenPort = 11000;

private static void StartListener()
{
bool done = false;

UdpClient listener = new UdpClient(listenPort);
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any,listenPort);

try
{
while (!done)
{
Console.WriteLine("Waiting for broadcast");
byte[] bytes = listener.Receive( ref groupEP);

Console.WriteLine("Received broadcast from {0} :\n {1}\n",
groupEP.ToString(),
Encoding.ASCII.GetString(bytes,0,bytes.Length));
}

}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
finally
{
listener.Close();
}
}

public static int Main()
{
StartListener();

return 0;
}
}



//////////////
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

class Program 
{
    static void Main(string[] args) 
    {
        Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,
            ProtocolType.Udp);

        IPAddress broadcast = IPAddress.Parse("192.168.1.255");

        byte[] sendbuf = Encoding.ASCII.GetBytes(args[0]);
        IPEndPoint ep = new IPEndPoint(broadcast, 11000);

        s.SendTo(sendbuf, ep);

        Console.WriteLine("Message sent to the broadcast address");
    }
}