C#中Socket编程

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下面在给出无连接的

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);//定义一网络端点
            Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//定义一个Socket
            newsock.Bind(ipep);//Socket与本地的一个终结点相关联
            Console.WriteLine("Waiting for a client

..");

            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);//定义要发送的计算机的地址
            EndPoint Remote = (EndPoint)(sender);//
            recv = newsock.ReceiveFrom(data, ref Remote);//接受数据
            Console.WriteLine("Message received from{0}:", Remote.ToString());
            Console.WriteLine(Encoding.ASCII.GetBytes(data,0,recv));

            string welcome = "Welcome to my test server!";
            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);
            }
        }
    }
}

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];//定义一个数组用来做数据的缓冲区
            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);//将数据发送到指定的终结点

            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
            EndPoint Remote = (EndPoint)sender;
            data = new byte[1024];
            int recv = server.ReceiveFrom(data, ref Remote);//接受来自服务器的数据

            Console.WriteLine("Message received from{0}:", Remote.ToString());
            Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
            while (true)//读取数据
            {
                input = Console.ReadLine();//从键盘读取数据
                if (input == "text")//结束标记
                {
                    break;
                }
                server.SendTo(Encoding.ASCII.GetBytes(input), Remote);//将数据发送到指定的终结点Remote
                data = new byte[1024];
                recv = server.ReceiveFrom(data, ref Remote);//从Remote接受数据
                stringData = Encoding.ASCII.GetString(data, 0, recv);
                Console.WriteLine(stringData);
            }
            Console.WriteLine("Stopping client");
            server.Close();
        }
    }
}

上面的示例只是简单的应用了socket来实现通信，你也可以实现异步socket、IP组播等等。

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