using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net.Sockets; using System.Net; using System.Threading; using System.IO; namespace TestClient {     public partial class Form1 : Form     {         private TcpClient client;         private Thread t;         private Socket sock;         private bool close = false;         public Form1()         {             InitializeComponent();         }         // 连接         private void btnConnect_Click(object sender, EventArgs e)         {             if(client == null)                 client = new TcpClient(new IPEndPoint(IPAddress.Parse("127.0.0.1"), int.Parse(txtLoalPort.Text)));             if (t == null)                 t = new Thread(new ThreadStart(ReciverMessage));             t.IsBackground = true;             t.Start();             btnSend.Enabled = true;             btnConnect.Enabled = false;         }                 // 接收消息         private void ReciverMessage()         {             client.Connect(IPAddress.Parse(txtSerIP.Text), int.Parse(txtSerPort.Text));             while (true)             {                 if (close)                     break;                     //NetworkStream nws = client.GetStream();                     //StreamReader sr = new StreamReader(nws);                     //string message = sr.ReadToEnd();                     //sr.Close();                     if(sock == null)                             sock = client.Client;                     byte[] buff = new byte[100];                     sock.Receive(buff);                     string message = Encoding.Default.GetString(buff);                     this.lstMessage.Items.Add(message);                            }             Thread.CurrentThread.Abort();         }         // 发送消息         private void btnSend_Click(object sender, EventArgs e)         {             string message = this.txtInput.Text;             byte[] buff = Encoding.Default.GetBytes(message);             sock.Send(buff);             txtInput.Text = "";         }         private void Form1_FormClosing(object sender, FormClosingEventArgs e)         {             close = true;             sock.Close();         }     } }