A20_Socket編程UDP協議通訊

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

using System.Threading;
using System.Net;
using System.Net.Sockets;

namespace A20_UDP_Server
{
    class Server
    {
        private Socket _SockServer;                    //服務器監聽套接字
        private bool _IsListenContecion = true;         //是否在監聽（目的是方便退出）

        public Server()
        {
            Console.WriteLine("---------------服務端啓動-----------------");
            //定義網絡終結點（封裝IP與端口）
            IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 1000);
            //實例化套接字
            _SockServer = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            //服務器端綁定地址
            _SockServer.Bind(endPoint);

            EndPoint ep = endPoint as EndPoint;

            while (true)
            {
                byte[] msgArray = new byte[1024 * 1024]; //1M空間
                //接收客戶端發來的數據，返回真實的長度
                int trueClinetMsgLength = _SockServer.ReceiveFrom(msgArray, ref ep);
                //byte數組轉String
                string strMsg = Encoding.UTF8.GetString(msgArray, 0, trueClinetMsgLength);
                //顯示客戶端發來的數據
                Console.WriteLine("客戶端發來的數據：" + strMsg);

            }
        }


        static void Main(string[] args)
        {
            Server obj = new Server();
        }
    }
}

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

using System.Threading;
using System.Net;
using System.Net.Sockets;

namespace A21_UDP_Client
{
    class Client
    {
        private Socket _SockClient;         //客戶端通訊套接字
        private IPEndPoint serverEndPoint;  //連接到的服務器IP與端口信息

        public Client()
        {
            //通訊地址端口號
            serverEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 1000);
            //建立客戶端的Sockte
            _SockClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            EndPoint ep = serverEndPoint as EndPoint;

            while (true)
            {
                //輸入信息
                string strMsg = Console.ReadLine();
                //退出
                if (strMsg == "gm_exit")
                {
                    break;
                }
                //字節轉換
                Byte[] byteArray = Encoding.UTF8.GetBytes(strMsg);
                //發送數據
                _SockClient.SendTo(byteArray, ep);
                Console.WriteLine("我： " + strMsg);
            }
            //關閉連接
            _SockClient.Shutdown(SocketShutdown.Both);
            //清理連接的資源
            _SockClient.Close();
        }


        static void Main(string[] args)
        {
            Client obj = new Client();
        }
    }
}

Server類和Client類分別在不同的啓動項中

這裏的Server和Client本質上是“接收端”和“發送端”的關係。

並非真正意義上的服務器和客戶端。