使用 输入主机IP或域名，输入开始结束端口。 原理 主要使用了ASP.NET 2.0的System.Net.Sockets组件。 StartPort = Convert.ToInt32(numStart.Text); EndPort = Convert.ToInt32(numEnd.Text); ipAdres = txtIP.Text; Thread[] pool = new Thread[(EndPort - StartPort) + 1]; int i = 0; DateTime start = DateTime.Now; // Loop through the ports between start port and end port for (int CurrPort = StartPort; CurrPort <= EndPort; CurrPort++) {
        Thread th = new Thread(new System.Threading.ParameterizedThreadStart(portAc)); //NOTE: better to leave to system. // th.Priority = ThreadPriority.AboveNormal;     th.Start(CurrPort);     pool[i] = th;     i++; } #region thread pool int k = --i; int retryCount = 0; for (; i >= 0; i--) {
    if (pool[i].IsAlive)     {
            i = k;         retryCount++; continue;     } if (retryCount == 1000)     {
    break;     } } #endregion #region httpfinger if (http) {
    // Create a request for the URL.             WebRequest request = WebRequest.Create("http://" + txtIP.Text); // If required by the server, set the credentials.     request.Credentials = CredentialCache.DefaultCredentials; // Get the response. try{
            HttpWebResponse response = (HttpWebResponse)request.GetResponse(); string serverType = response.Headers["server"]; if (serverType.Contains("IIS"))         {
                lblServer.Text = "Windows System "; if (serverType.Contains("5."))             {
                    lblServer.Text += "XP/2000";             } if (serverType.Contains("6."))             {
                    lblServer.Text += "2003";             }         } if (serverType.ToLower().Contains("apache"))         {
                lblServer.Text += "probably linux";         }         lblServer.Text += " " + serverType;     } catch(Exception Err){
    //sometime which returns 404 and it makes a problem.     } } #endregion DateTime end = DateTime.Now; TimeSpan sonuc = end - start; lblzaman.Text = sonuc.TotalSeconds + " total secs";上面是主要的代码，当然我们需要使用线程了，否则，这么多端口的扫描是非常浪费时间的。 public void portAc(object portNoObj) {
    int portNo = (int)portNoObj;     TcpClient TcpScan = new TcpClient(); try     {
    // Try to connect         TcpScan.Connect(ipAdres, portNo); if (!TcpScan.Connected) return; // If there's no exception, we can say the port is open         log += "Port " + portNo + " open\r\n"; //NOTE: We may include more finger tips to here switch (portNo)         {
    case 80: http = true; break;         } try         {
                DataRow dr = dt.NewRow();             dr[0] = "http://www.portsdb.org/bin/portsdb.cgi?portnumber=" +                      portNo + "&protocol=ANY&String=";             dt.Rows.Add(dr);         } // Ends Try catch (Exception Err)         {
    throw Err;         }     } catch     {
    // An exception occured, thus the port is probably closed     } } //TcpClient类提供了网络连接、发送和接收的功能，不过这里我们只是使用了它的连接方法。