using System; using System.Collections.Generic; using System.Drawing; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using System.Threading; using System.IO; using System.Text; using System.Text.RegularExpressions;  namespace Server {   public partial class MainForm : Form   {     private TcpListener listener;          private Dictionary<String,TcpClient> socketList;     private bool tag = true;     private StringBuilder charList;          public MainForm()     {       InitializeComponent();       Control.CheckForIllegalCrossThreadCalls = false;     }          void Bu_StartClick(object sender, EventArgs e)     {       cb_chatList.Items.Clear();       selectChat.Text="";       int port = 8888;       //創建服務端，并且啟動       try{         listener = new TcpListener(IPAddress.Parse(ipAddress()),port);         listener.Start();                    bu_Start.Enabled = false;         bu_stop.Enabled = true;       }catch(Exception ex)       {         MessageBox.Show("服務器啟動失敗， 原因："+ex.Message);         bu_Start.Enabled = true;         bu_stop.Enabled = false;         return;       }       selectChat.Text = "服務器啟動成功，訪問IP："+ipAddress()+" 端口號："+port;              //記錄住連接的客戶端       socketList = new Dictionary<String,TcpClient>();       charList = new StringBuilder();              //使用多線程，用于多個客戶端接入       Thread th = new Thread(new ThreadStart(executeTask));       th.Start();     }     public void executeTask()     {       while(tag)       {         //等待用戶連接         TcpClient client = null;         try{           client = listener.AcceptTcpClient();         }catch(Exception)         {         }         Thread th = new Thread(executeRead);         th.Start((Object)client);       }     }     public void executeRead(Object pamars)     {       //永久監聽讀取客戶端       TcpClient client = pamars as TcpClient;       while(tag)       {         NetworkStream ns = client.GetStream();         StreamReader sr = new StreamReader(ns);         String msg = String.Empty;         String people = String.Empty;         try {           msg = sr.ReadLine();           if(msg.IndexOf("<clientName>")!=-1)           {             msg = Regex.Split(msg,"=")[1];             cb_chatList.Items.Add(msg);                    charList.Append(msg).Append("<@>");             socketList.Add(msg,client);             msg = "<br>歡迎【"+msg+"】光臨<br>";           }           selectChat.AppendText(msg.Replace("<br>","/r/n"));           sendMsg(String.Empty,msg);         } catch (Exception) {           //MessageBox.Show(ex.Message.ToString());           break;         }       }     }     public void sendMsg(String target,String msg)     {       if(String.Empty!=target)       {         TcpClient client = socketList[target];         StreamWriter sw = new StreamWriter(client.GetStream());         sw.WriteLine(msg);         sw.Flush();        }else{         Dictionary<String,TcpClient>.KeyCollection keyColl = socketList.Keys;         foreach (String name in keyColl)          {           StreamWriter sw = new StreamWriter(socketList[name].GetStream());           sw.WriteLine(msg+"<@=@>"+charList.ToString());           sw.Flush();                }       }     }     /*根據計算名獲取IP地址*/     public String ipAddress()     {       IPAddress[] address = Dns.GetHostAddresses(Dns.GetHostName());       return address[2].ToString();     }          void ServerFromFormClosing(object sender, FormClosingEventArgs e)     {       e.Cancel = false;       if(tag)         tag = false;       if(listener!=null)         listener.Stop();     }          void Bu_stopClick(object sender, EventArgs e)     {       bu_Start.Enabled = true;       bu_stop.Enabled = false;       if(tag)         tag = false;       if(listener!=null)         listener.Stop();     }   } } 

using System; using System.Drawing; using System.Windows.Forms; using System.Threading; using System.Net; using System.Net.Sockets; using System.IO; using System.Text; using System.Text.RegularExpressions;  namespace Client {   public partial class MainForm : Form   {     private System.Windows.Forms.Timer closeWindowTimer;          private StreamReader sr;     private StreamWriter sw;     private TcpClient tc;     private ClientLong cl;     private bool tag = true;            public MainForm(TcpClient tcp,ClientLong clo)     {       cl = clo;       tc = tcp;       InitializeComponent();       Control.CheckForIllegalCrossThreadCalls = false;       bu_simple.Hide();     }     void ClientFromLoad(object sender, EventArgs e)     {       PiayCheckedChanged();     }          /*事件方法*/     public void PiayCheckedChanged()     {       closeWindowTimer = new System.Windows.Forms.Timer();       closeWindowTimer.Interval = 1000;       closeWindowTimer.Tick += new EventHandler(theout);       closeWindowTimer.Start();     }          /*執行的事件*/     public void theout(object source, EventArgs e)     {       //這里單獨開一個線程用來顯示信息       try{         Thread t1 = new Thread(new ThreadStart(readMsg));         t1.Start();       }catch(Exception)       {       }     }     void readMsg()     {       if(tag && tc!=null){         sr = new StreamReader(tc.GetStream());         String msg = sr.ReadLine();         String[] address = Regex.Split(msg,"<@=@>");         chatText.AppendText(address[0].Replace("<br>","/r/n"));         address = Regex.Split(address[1],"<@>");         cb_chatList.Items.Clear();         foreach (String s in address)         {           if(!String.IsNullOrEmpty(s) && s != cl.clientName)             cb_chatList.Items.Add(s);                 }       }     }     void Button1Click(object sender, EventArgs e)     {       if(String.IsNullOrEmpty(textBox2.Text)){         MessageBox.Show("請輸入消息");return;       }       sw = new StreamWriter(tc.GetStream());       sw.WriteLine("<br>"+cl.clientName+"　　"+DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")+"<br>　"+textBox2.Text);       textBox2.Text = "";       sw.Flush();     }     void Bu_exitClick(object sender, EventArgs e)     {       MainFormFormClosing(null,null);     }     void Button2Click(object sender, EventArgs e)     {       chatText.Text = "";      }     void MainFormFormClosing(object sender, FormClosingEventArgs e)     {       closeWindowTimer.Stop();       cl.Close();       tag = false;       if(sr!=null)         sr.Close();       if(sw!=null)         sw.Close();     }     void Bu_simpleClick(object sender, EventArgs e)     {       String selected = cb_chatList.Text;       if(selected==null)       {         MessageBox.Show("請選擇單聊對象");         return;       }     }   } }