C# 簡單TCP協議

需要引用 using System.Net;
using System.Net.Sockets;

namespace TCPServer {
    class Program {
        static void Main(string[] args) {
            int port = 888;//端口
            TcpClient tcpClient;//創建TCP連接對象(存入客服端所鏈接)
            IPAddress[] serverIP= Dns.GetHostAddresses("127.0.0.1");//定義IP地址
            IPAddress localAddres = serverIP[0];//Ip地址；
            TcpListener tcpListener = new TcpListener(localAddres, port);//監聽套接字
            tcpListener.Start();//開始監聽
            Console.WriteLine("服務器啟動成功，等待用戶接入。。。");//輸出信息
            try {
                tcpClient = tcpListener.AcceptTcpClient();//每接收一個客服端生成一個TcpClient
                NetworkStream networkStream = tcpClient.GetStream();//獲取網絡數據流
                BinaryReader reader = new BinaryReader(networkStream);//定義數據讀取對象
                BinaryWriter writer = new BinaryWriter(networkStream);//定義數據寫入對象
                while(true) {
                    try {
                        string strReader = reader.ReadString();//接收消息
                        string[] strReaders = strReader.Split(new char[] { ' ' });//截取客服端信息
                        Console.WriteLine("有客服端接入，客戶IP：" + strReaders[0]);//輸出接收客服端IP地址
                        string strWriter = "我是服務器，歡迎光臨";//定義服務端要寫的內容
                        Console.WriteLine("來自客服端的消息：" + strReaders[1]);//輸出接收的消息
                        writer.Write(strWriter);//向對方發送消息
                    }
                    catch {
                        break;
                    }
                }
            }
            catch {
                Console.WriteLine("接收數據失敗");
            }

        }
    }
}

namespace TCPClient {
    class Program {
        static void Main(string[] args) {
            TcpClient tcpClient = new TcpClient();//創建一個TcpClient對象，自動分配主機IP地址和端口號
            tcpClient.Connect("127.0.0.1", 888);//連接服務器，其IP和端口號為127.0.0.1和888
            if (tcpClient != null) {
                Console.WriteLine("連接服務器成功");
                NetworkStream networkStream = tcpClient.GetStream();//獲取網絡數據流
                BinaryReader reader = new BinaryReader(networkStream);//定義數據讀取對象
                BinaryWriter writer = new BinaryWriter(networkStream);//定義數據寫入對象
                string localip = "127.0.0.1";//存儲本機IP，默認值為127.0.0.1
                IPAddress[] ips = Dns.GetHostAddresses(Dns.GetHostName());//獲取所有Ip地址
                foreach (var item in ips) {
                    if (!item.IsIPv6SiteLocal)//如果不是ipv6
                        localip = item.ToString();
                }
                writer.Write(localip + " 你好服務器，我是客服端");//向服務器發送消息
                while (true) {
                    try {
                        string strReader = reader.ReadString();//接收服務器發送的數據
                        if(strReader!=null) {
                            Console.WriteLine("來自服務器的消息：" + strReader);//輸出接收服務器的消息
                        }
                    }
                    catch {
                        break;//出錯退出循環
                    }
                }
            }
            else {
                Console.WriteLine("連接服務器錯誤");
            }
        }
    }
}

上述代碼，通俗易懂，注釋詳細，適合小白學習。