C# 使用Socket實現長鏈接和短連接

直接上代碼

服務端：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;

namespace SocketServer
{
    /// <summary>
    /// MainWindow.xaml 的交互邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        private Socket _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        private byte[] _result = new byte[1024];

        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            SocketService();
        }

        public void SocketService()
        {
            textBlock.Text +=  ("服務端已啟動");
            var host = "127.0.0.1";
            var port = 5000;
            _socket.Bind(new IPEndPoint(IPAddress.Parse(host), port));
            _socket.Listen(10); // 設定最多10個排隊連接請求
            Task.Run(ListenClientConnect);
        }

        private void ListenClientConnect()
        {
            while (true)
            {
                var clientSocket = _socket.Accept();
                clientSocket.Send(Encoding.UTF8.GetBytes("我是伺服器"));
                var receiveThread = new Thread(ReceiveMessage);
                receiveThread.Start(clientSocket);
            }
        }

        private void ReceiveMessage(object clientSocket)
        {
            Socket myClientSocket = (Socket)clientSocket;
            while (true)
            {
                try
                {
                    //通過clientSocket接收數據  
                    int receiveNumber = myClientSocket.Receive(_result);
                    if (receiveNumber == 0)
                        return;
                    Application.Current.Dispatcher.Invoke(() =>
                    {
                        textBlock.Text += string.Format("接收客戶端{0} 的消息：{1}", myClientSocket.RemoteEndPoint.ToString(), Encoding.UTF8.GetString(_result, 0, receiveNumber));
                    });
                    
                    //給Client端返回信息
                    string sendStr = "已成功接到您發送的消息";
                    byte[] bs = Encoding.UTF8.GetBytes(sendStr);//Encoding.UTF8.GetBytes()不然中文會亂碼
                    myClientSocket.Send(bs, bs.Length, 0);  //返回信息給客戶端
                    //myClientSocket.Close(); //發送完數據關閉Socket並釋放資源//長連接的話就不關閉
                    //Console.ReadLine();
                }
                catch (Exception ex)
                {
                    Application.Current.Dispatcher.Invoke(() =>
                    {
                        textBlock.Text += (ex.Message);
                    });
                    myClientSocket.Close();//關閉Socket並釋放資源
                    //myClientSocket.Shutdown(SocketShutdown.Both);//禁止發送和上傳
                    break;
                }
            }
        }
    }
}

客戶端：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows;

namespace SocketClient
{
    /// <summary>
    /// MainWindow.xaml 的交互邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            ShotLink("321");
            // LongLink();
        }

        /// <summary>
        /// 短連接，最後調用Close釋放資源
        /// </summary>
        /// <param name="input"></param>
        private void ShotLink(string input)
        {
            //設定伺服器IP地址  
            IPAddress ip = IPAddress.Parse("127.0.0.1");
            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            try
            {
                clientSocket.Connect(new IPEndPoint(ip, 5000)); //配置伺服器IP與埠  
                textBlock.Text +=  ("連接伺服器成功");
            }
            catch
            {
                textBlock.Text +=  ("連接伺服器失敗！");
                return;
            }

            string sendMessage = "你好";//發送到服務端的內容
            clientSocket.Send(Encoding.UTF8.GetBytes(sendMessage));//向伺服器發送數據，需要發送中文則需要使用Encoding.UTF8.GetBytes()，否則會亂碼
            textBlock.Text +=  ("向伺服器發送消息：" + sendMessage);

            //接受從伺服器返回的信息
            string recvStr = "";
            byte[] recvBytes = new byte[1024];
            int bytes;
            bytes = clientSocket.Receive(recvBytes, recvBytes.Length, 0);    //從伺服器端接受返回信息 
            recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
            textBlock.Text +=  string.Format("服務端發來消息：{0}", recvStr);//回顯伺服器的返回信息
            //每次完成通信後，關閉連接並釋放資源
            clientSocket.Close();
            Console.ReadLine();
        }


        /// <summary>
        /// 長連接不調用Close釋放資源
        /// </summary>
        private void LongLink()
        {
            //設定伺服器IP地址  
            IPAddress ip = IPAddress.Parse("127.0.0.1");
            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            try
            {
                clientSocket.Connect(new IPEndPoint(ip, 5000)); //配置伺服器IP與埠  
                textBlock.Text +=  ("連接伺服器成功");
            }
            catch
            {
                textBlock.Text +=  ("連接伺服器失敗");
                return;
            }

            //迴圈讀取輸入數據
            while (true)
            {
                textBlock.Text +=  ("請輸入");
                string sentstr = "123";
                SentMsg(sentstr, clientSocket);
                Thread.Sleep(5000);
            }
        }


        /// <summary>
        /// 長連接，不釋放資源
        /// </summary>
        /// <param name="sentstr"></param>
        /// <param name="clientSocket"></param>
        private void SentMsg(string sentstr, Socket clientSocket)
        {
            string sendMessage = "你好";//發送到服務端的內容
            sendMessage = sentstr;//發送到服務端的內容
            //向伺服器發送數據，需要發送中文則需要使用Encoding.UTF8.GetBytes()，否則會亂碼
            clientSocket.Send(Encoding.UTF8.GetBytes(sendMessage));
            textBlock.Text +=  ("向伺服器發送消息：" + sendMessage);

            //接受從伺服器返回的信息
            string recvStr = "";
            byte[] recvBytes = new byte[1024];
            int bytes;
            bytes = clientSocket.Receive(recvBytes, recvBytes.Length, 0);    //從伺服器端接受返回信息 
            recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
            textBlock.Text +=  string.Format("服務端發來消息：{0}", recvStr);    //回顯伺服器的返回信息
            //clientSocket.Close();//關閉連接並釋放資源//如果是長連接，註釋掉close
        }
    }
}