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   源码介绍

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一个服务端监听程序源码，一个客户端发消息程序源码，入门级

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            int port = 6000;
            string host = "127.0.0.1";//服务器端ip地址

            IPAddress ip = IPAddress.Parse(host);
            IPEndPoint ipe = new IPEndPoint(ip, port);

            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            clientSocket.Connect(ipe);

            //send message
            string sendStr = "send to server : hello,ni hao";
            byte[] sendBytes = Encoding.ASCII.GetBytes(sendStr);
            clientSocket.Send(sendBytes);

            //receive message
            string recStr = "";
            byte[] recBytes = new byte[4096];
            int bytes = clientSocket.Receive(recBytes, recBytes.Length, 0);
            recStr  = Encoding.ASCII.GetString(recBytes, 0, bytes);
            Console.WriteLine(recStr);

            clientSocket.Close();
        }
    }
}