using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.Net.Sockets;using System.Threading;using System.Diagnostics;using System.Net;namespace Demo_Net{  //本機為服務端  //下午加一個判斷網絡是否連接；以及做出相應的判斷；  class Program  {    static Socket msock;    static void Main(string[] args)    {             //先判斷是否ping通：        string ips = "10.18.14.111";        string str = NetConnect(ips);        Console.WriteLine(str);        Console.ReadLine();    }    //通過ping的方法判斷是否連接；    private static string NetConnect(string ip)    {      Process p = new Process();      p.StartInfo.FileName = "cmd.exe";      p.StartInfo.UseShellExecute = false;      p.StartInfo.RedirectStandardError = true;      p.StartInfo.RedirectStandardInput = true;      p.StartInfo.RedirectStandardOutput = true;      p.StartInfo.CreateNoWindow = false;      string pingstr;      p.Start();      p.StandardInput.WriteLine("ping -n 1 " + ip);      p.StandardInput.WriteLine("exit");      string strRst = p.StandardOutput.ReadToEnd();      if (strRst.IndexOf("(0% 丟失)") != -1)      {        pingstr = "連接成功";         //定義socket連接 需要的本機ip以及相應的端口；        msock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,         ProtocolType.Tcp);        var localIP = new IPEndPoint(IPAddress.Parse("10.18.14.23"), 10001);        msock.Bind(localIP);        //自己定義最大網絡連接數        msock.Listen(10);        //新建線程處理；        Thread th = new Thread(delegate()        {          Rec();        });        th.IsBackground = true;        th.Start();      }       else      {        pingstr = "連接超時";      }      p.Close();      return pingstr;    }    //監聽是否有鏈接，新開線程處理    static void Rec()    {      do      {        Socket s = msock.Accept();        Thread th = new Thread(delegate() {          Parse(s);        });        th.IsBackground = true;        th.Start();              } while (true);    }     //有鏈接時處理獲取的信息    static void Parse(Socket s)    {      do      {        byte[] b = new byte[1000];        int l = s.Receive(b);        b = b.Take(l).ToArray();        string rs = string.Empty;        for (int i = 0; i < b.Length; i++)        {          rs = rs + b[i].ToString();        }        //解碼        Console.WriteLine(Encoding.ASCII.GetString(b, 0, l));      } while (true);          }  } }