C#实现tcp的接收与发送

using DWMSFaceVerifyClient.UTIL;
using Newtonsoft.Json;
using PreviewDemo.Bean;
using PreviewDemo.Util;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PreviewDemo 
{
    class DeviceHeart 
    {

        private const string Finish_Flag = "[#over]";
        private TcpListener tcpListener;
        private Thread listenThread;
        //private static TcpClient m_tcpClient;

        public DeviceHeart()
        {
            this.tcpListener = new TcpListener(5000);
            this.listenThread = new Thread(new ThreadStart(ListenForClients));
            this.listenThread.Start();
        }

        private void ListenForClients()
        {
            try
            {
                this.tcpListener.Start();
            }
            catch (Exception ex)
            {
                //MessageBox.Show("端口冲突,请重新启动软件!");
                Console.WriteLine(ex.Message);
                return;
            }


            while (true)
            {
                //blocks until a client has connected to the server
                TcpClient client = this.tcpListener.AcceptTcpClient();

                Heart heart = new Heart(client);
                Thread mythread = new Thread(new ThreadStart(heart.deal));  //将线程设为后台运行  
                mythread.Start();
                Thread.Sleep(50);
            }
        }
        class Heart
        {
            TcpClient client = null;
            NetworkStream clientStream = null;
            public Heart(TcpClient client)
            {
                this.client = client;
            }
            public void deal()
            {
                try
                {
                    clientStream = client.GetStream();

                    byte[] message = new byte[512];
                    string recvText = "";
                    int bytesRead;

                    
                        bytesRead = 0;

                        try
                        {
                            //blocks until a client sends a message
                            bytesRead = clientStream.Read(message, 0, 512);
                        }
                        catch (Exception ex)
                        {
                            //a socket error has occured
                            Console.WriteLine("关闭Socket异常:",ex);
                            if (client != null)
                            {
                                client.Close();
                                client = null;
                            }
      
                        }
                        if (bytesRead > 0)
                        {
                            recvText = recvText + Encoding.UTF8.GetString(message, 0, bytesRead);
                            //MessageBox.Show("接收到消息：" + recvText);
                           IDCardInfo cardinfo = JsonConvert.DeserializeObject<IDCardInfo>(recvText);
                           String xylx = cardinfo.Xylx;
                           String heart = cardinfo.Heart;
                           if (xylx != null && xylx.Equals("0") && heart != null && heart.Equals("2"))
                           {
                               dealDate(cardinfo);
                           }
                            //MessageBox.Show(cardinfo.Xylx);
                            /*
                            if (!Cache.serverIP.Equals(recvText))
                            {
                                Cache.serverIP = recvText;
                                Configuration cf = new Configuration();
                                cf.Load("config.ini", false, Encoding.GetEncoding("utf-8"));
                                cf.WriteProfileString("System", "serverIP", recvText);
                                cf.Save("config.ini", Encoding.GetEncoding("utf-8"));
                            }*/

                        }
                        else
                        {
                            recvText = "";
                            Thread.Sleep(1000);
                        }
                    
                }
                catch (Exception ex)
                {
                    Console.WriteLine("关闭Socket：",ex);
                    if (client != null)
                    {
                        client.Close();
                        client = null;
                    }

                }
                finally
                {
                    if (clientStream != null)
                    {
                        clientStream.Flush();
                        clientStream.Close();
                    }
                    if (client != null)
                    {
                        client.Close();
                    }
                }    
            }

            private void dealDate(IDCardInfo cardinfo)
            {
                List<Device> listdevice = Cache.listdevice;//设备list集合
                String videoIp = cardinfo.VideoIP;//接收到的匹配设备
                foreach (Device dev in listdevice)
                {
                    if (ip!= null && !ip.Equals("") && ip.Equals(dev.Ip))
                    {
                        String value = "{\"xy\":\"1\",\"ip\":\"" + ip + "\",\"online\":\"" + dev.Online + "\"}";
                        TCPMessage tcpm = new TCPMessage(value, dev.ServIp);
                        tcpm.SendMessage();
                    }
                }

            }
        }
    }
}

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

namespace DWMSFaceVerifyClient.UTIL
{
    class TCPMessage
    {
        private const string Finish_Flag = "[#over]";
        Thread threadsend = null;
        string message = "";
        string serviceIp = null;
        public TCPMessage(String value,String ip)
        {    
            serviceIp = ip;
            message = value + "#over";

        }

        public void SendMessage()
        {
            DateTime dt = DateTime.Now;
            NetworkStream stream = null;
            TcpClient m_tcpClient = null;
            try
            {
            try
            {
                m_tcpClient = new TcpClient();
                m_tcpClient.Connect(serviceIp, 6005);
            }
            catch (Exception ex)
            {
                Console.WriteLine("连接终端失败：" + ex.Message);
            }

            // 发送比对结果                                           
                byte[] msg = Encoding.UTF8.GetBytes(message);
                stream = m_tcpClient.GetStream();
                stream.Write(msg, 0, msg.Length);
                DateTime dt1 = DateTime.Now;
                TimeSpan ts = dt1 - dt;
                Console.WriteLine("发送数据耗时：" + ts.Milliseconds);
                Console.WriteLine("往终端发送消息成功");
            }
            catch (Exception ex)
            {
                Console.WriteLine("发送消息异常:" + ex.Message);
            }finally
            {
                if (stream != null)
                {
                    stream.Flush();
                    stream.Close();
                }
                if (m_tcpClient != null)
                {
                    m_tcpClient.Close();
                }
            }

        }
    }
}