public class SocketService
    {
        //和客户端连接的套接字
        static Socket socketListener = null;
        //用于暂存客户端连接信息的套接字集合
        static Dictionary<string, Socket> dictSocketClients = new Dictionary<string, Socket>() { };

        /// <summary>
        /// 启动监听的入口函数
        /// </summary>
        public static void Start()
        {
            try
            {
                //监听器，用于监听客户端发来的消息（IPv4寻址，流式连接，TCP协议）
                socketListener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

                //获取配置中的IP和端口
                var sIP = CompressionParameter.m_dictConfig[CompressionParameter.m_sServerIP];
                var nPort = int.Parse(CompressionParameter.m_dictConfig[CompressionParameter.m_sServerPort]);

                //重新保存IP和端口到配置文件中
                CompressionParameter.m_configManager.SaveAppSetting(CompressionParameter.m_sServerIP, sIP);
                CompressionParameter.m_configManager.SaveAppSetting(CompressionParameter.m_sServerPort, nPort.ToString());

                //监听对象绑定IP地址与端口设置
                IPAddress ipAddress = IPAddress.Parse(sIP);
                IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, nPort);
                socketListener.Bind(ipEndPoint);

                //排队长度
                socketListener.Listen(8);

                //创建一个监听线程
                new Thread(ListenForConnectionRequests) { IsBackground = true }.Start();
                Log.Loging.Info($"Listener On {sIP}:{nPort}");
            }
            catch (Exception ex)
            {
                Log.Loging.Error($"Exception: {ex.Message}");
            }
        }

        /// <summary>
        /// 监听客户端发来连接请求
        /// </summary>
        private static void ListenForConnectionRequests()
        {
            //负责连接的套接字对象
            Socket socketConnector = null;
            while (true)
            {
                try
                {
                    socketConnector = socketListener.Accept();
                }
                catch (Exception e)
                {
                    Log.Loging.Error(e.Message);
                    break;
                }

                //获取客户端的IP和端口号
                IPEndPoint ipEndPoint = socketConnector.RemoteEndPoint as IPEndPoint;
                IPAddress ipAddress = ipEndPoint.Address;
                int nPort = ipEndPoint.Port;

                //将客户端连接成功的消息返回给客户端
                var sConnectionInfo = $"Connect Successfully! Your IP: {ipAddress}, Your Port: {nPort}";
                socketConnector.Send(ResponseOkToBuffer(sConnectionInfo));

                //保存客户端连接信息
                var sClientInfo = socketConnector.RemoteEndPoint.ToString();
                Log.Loging.Info($"Client [{sClientInfo}] Connected");
                dictSocketClients.Add(sClientInfo, socketConnector);

                //创建一个通信线程，接收请求
                new Thread(new ParameterizedThreadStart(ListenForMessages)) { IsBackground = true }.Start(socketConnector);
            }
        }

        /// <summary>
        /// 接收器，用于接收客户端消息
        /// </summary>
        /// <param name="socketClientInfo"></param>
        static void ListenForMessages(object socketClientInfo)
        {
            //负责通讯的套接字（消息往来负责人，我们将其命名为“出纳员”）
            Socket socketTeller = socketClientInfo as Socket;
            while (true)
            {
                //创建一个内存缓冲区，大小为1024*1024字节，即1M
                var arrMessage = new byte[1024 * 1024];
                //将接收到的信息存入内存缓冲区，并返回其字节数组的长度
                try
                {
                    int nLength = socketTeller.Receive(arrMessage);
                    var sMessage = Encoding.UTF8.GetString(arrMessage, 0, nLength);
                    Log.Loging.Info($"Server Received a new Message: {sMessage}");
                    socketTeller.Send(ResponseOkToBuffer($"Server Received Your Message: {sMessage}"));
                    //出纳负责处理命令并出具回执
                    ExecuteCommand(sMessage, ref socketTeller);
                }
                catch (Exception ex)
                {
                    Log.Loging.Error($"Server Exception: {ex.Message}");
                    var sClient = socketTeller.RemoteEndPoint.ToString();
                    dictSocketClients.Remove(sClient);
                    Log.Loging.Info($"Server Removed Client: {sClient}");
                    Log.Loging.Info($"Server Fired a Teller");
                    socketTeller.Close();
                    break;
                }
            }
        }

        /// <summary>
        /// 执行命令
        /// </summary>
        /// <param name="sCommand"></param>
        /// <param name="socket"></param>
        static void ExecuteCommand(string sCommand, ref Socket socket)
        {
            var sCmd = sCommand.Trim();
            var sMessage = "Nothing to do with Whitespace Command.";
            if (string.IsNullOrEmpty(sCmd))
            {
                Log.Loging.Info(sMessage);
            }
            else
            {
                if (0 == string.Compare(sCmd, "CompressNormally", StringComparison.OrdinalIgnoreCase))
                {
                    sMessage = "Executed: CompressNormally";
                    Compression.CompressNormally();
                }
                else if (0 == string.Compare(sCmd, "CompressAutomatically", StringComparison.OrdinalIgnoreCase))
                {
                    sMessage = "Executed: CompressAutomatically";
                    Compression.CompressAutomatically();
                }
                else if (0 == string.Compare(sCmd, "CompressCompletely", StringComparison.OrdinalIgnoreCase))
                {
                    sMessage = "Executed: CompressCompletely";
                    Compression.CompressCompletely();
                }
                else
                {
                    sMessage = $"Nothing to do with CommandLine: {sCmd}";
                    Log.Loging.Info(sMessage);
                }
            }
            socket.Send(ResponseOkToBuffer(sMessage));
        }

        static byte[] ResponseOkToBuffer(string sMessage)
        {
            return Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new ResponseOk() { Description = sMessage }));
        }

        static byte[] ResponseCommonErrorToBuffer(string sMessage)
        {
            return Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new ResponseCommonError() { Description = sMessage }));
        }
    }

• 界面

• 代码

    public partial class FormSender : Form
    {
        Thread threadClient = null;
        Socket socketClient = null;
        IPAddress ipAddress = null;

        private delegate void DelegateWriteLine(string sContent);

        int nPort = -1;
        public FormSender()
        {
            InitializeComponent();

        }

        private void TextBoxPort_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!(char.IsNumber(e.KeyChar)) && (char)8 != e.KeyChar)
            {
                e.Handled = true;
            }
        }

        private void ButtonClearParam_Click(object sender, EventArgs e)
        {
            ipAddressInput1.Value = null;
            textBoxPort.Clear();
        }

        private void ButtonCompressNormally_Click(object sender, EventArgs e)
        {
            textBoxEditor.Text = "CompressNormally";
        }

        private void ButtonCompressAutomatically_Click(object sender, EventArgs e)
        {
            textBoxEditor.Text = "CompressAutomatically";
        }

        private void ButtonCompressCompletely_Click(object sender, EventArgs e)
        {
            textBoxEditor.Text = "CompressCompletely";
        }

        private void ButtonSend_Click(object sender, EventArgs e)
        {
            try
            {
                var sContent = textBoxEditor.Text.Trim();
                if (string.IsNullOrEmpty(sContent))
                {
                    MessageBox.Show("请先输入要发送的内容！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    return;
                }
                byte[] arrMessage = Encoding.UTF8.GetBytes(sContent);
                WriteLine($"Client: \r\n{sContent}");
                if (null == socketClient)
                {
                    MessageBox.Show("请先连接服务器端，成功后再发送消息！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
                else
                {
                    socketClient.Send(arrMessage);
                }
            }
            catch(Exception ex)
            {
                WriteLine($"Exception: {ex.Message}");
            }
        }

        private void ButtonSetParam_Click(object sender, EventArgs e)
        {
            if (null != threadClient)
            {
                if (null != socketClient)
                {
                    socketClient.Dispose();
                }
                threadClient.Abort();
            }
            socketClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            ipAddress = IPAddress.Parse(ipAddressInput1.Value);
            nPort = int.Parse(textBoxPort.Text);

            try
            {
                IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, nPort);
                socketClient.Connect(ipEndPoint);
            }
            catch (Exception ex)
            {
                if (null != socketClient)
                {
                    socketClient.Dispose();
                    socketClient = null;
                }
                WriteLine($"Exception. {ex.Message}");
            }
            threadClient = new Thread(Receiver)
            {
                IsBackground = true
            };
            threadClient.Start();
        }

        private void Receiver()
        {
            while (true)
            {
                Application.DoEvents();
                try
                {
                    byte[] arrMessage = new byte[1024 * 1024];
                    int nLength = socketClient.Receive(arrMessage);
                    string sMessage = Encoding.UTF8.GetString(arrMessage, 0, nLength);
                    WriteLine($"Server: \r\n{sMessage}");
                }
                catch (Exception e)
                {
                    WriteLine($"Exception: {e.Message}");
                    break;
                }
            }
        }



        private void WriteLine(string sContent)
        {
            if (InvokeRequired)
            {
                var delegateWrite = new DelegateWriteLine(WriteLine);
                Invoke(delegateWrite, sContent);
            }
            else
            {
                if (textBoxMessage.GetLineFromCharIndex(textBoxMessage.Text.Length) > 100)
                    textBoxMessage.Clear();
                textBoxMessage.AppendText(DateTime.Now.ToString("HH:mm:ss  ") + sContent + "\r\n");
                textBoxMessage.ScrollToCaret();
            }
        }
    }

转载自：https://blog.csdn.net/a_dev/article/details/88602847