简单的无连接的udp服务器和客户端

 服务器

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace SimpleUdpSrvr
...{
    class Program
    ...{
        static void Main(string[] args)
        ...{
            int recv;
            byte[] data = new byte[1024];
            IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050);
            Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            newsock.Bind(ipep);
            Console.WriteLine("Waiting for a client...");
            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
            EndPoint Remote = (EndPoint)sender;
            recv = newsock.ReceiveFrom(data, ref Remote);
            Console.WriteLine("Message received from {0}:", Remote.ToString());
            Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
            string welcome = "Welcome to my server test";
            data = Encoding.ASCII.GetBytes(welcome);
            newsock.SendTo(data, data.Length, SocketFlags.None, Remote);
            while (true)
            ...{
                data = new byte[1024];
                recv = newsock.ReceiveFrom(data, ref Remote);
                Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                newsock.SendTo(data, recv, SocketFlags.None, Remote);
            }
        }
    }
}

 

 

客户端

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace SimpleUdpClient
...{
    class Program
    ...{
        static void Main(string[] args)
        ...{
            byte[] data = new byte[1024];
            string input, stringdata;
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050);
            Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            string welcome = "Hello ,are you there?";
            data = Encoding.ASCII.GetBytes(welcome);
            server.SendTo(data, data.Length, SocketFlags.None, ipep);
            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
            EndPoint remote = (EndPoint)sender;
            data = new byte[1024];
            int recv = server.ReceiveFrom(data, ref remote);
            Console.WriteLine("Message receive from {0}:", remote.ToString());
            Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
            while (true)
            ...{
                input = Console.ReadLine();
                if (input == "exit")
                    break;
                server.SendTo(Encoding.ASCII.GetBytes(input), remote);
                data = new byte[1024];
                recv = server.ReceiveFrom(data,ref remote);
                stringdata = Encoding.ASCII.GetString(data, 0, recv);
            }
            Console.WriteLine("Stopping client");
            server.Close();
        }
    }
}