Multithreading tests network conditions. Machines in different network segments use nbtstat to judge whether they are powered on

using System; using System.Collections.Generic; using System.Text; using System.Threading; using System.Net.NetworkInformation; using System.Diagnostics; using System.Net; using System.Runtime.InteropServices; namespace Threads { class Program { static void Main(string[] args) { for (int i = 1; i <=254; i++) { Work w = new Work(); w.IP ="192.168.1."+i.ToString(); Thread t = new Thread(new ThreadStart(w.main)); t.Start(); Thread.Sleep(1000); } Console.ReadLine(); } } public class Work { [DllImport("Iphlpapi.dll")] private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length); [DllImport("Ws2_32.dll")] private static extern Int32 inet_addr(string ip); public string count ; public int i = 0; public string IP; public void main() { // Realization ping function Ping pingSender = new Ping(); PingReply reply =pingSender.Send(IP); if (reply.Status == IPStatus.Success) { long RoundtripTime = reply.RoundtripTime; if(IP==reply.Address.ToString()) { Console.Write(IP + " Sure ping through , Time delay "+reply.RoundtripTime.ToString()); } if (RoundtripTime > 10) { Console.Write(" Excessive delay , Time is "+RoundtripTime.ToString()); } Console.WriteLine(); } else// utilize netbios agreement , Command nbtstat Determine whether the client is online , Especially for different network segments ping Accessible machine { string s = GetNetCardAddress(IP); if ("".Equals(s)) { Console.WriteLine(IP + " no "); } else { Console.WriteLine(IP + " through ,MAC by " + s); } } } // Get remote host mac Address public string GetNetCardAddress(string strIp) { string mac = ""; System.Diagnostics.Process process = new System.Diagnostics.Process(); process.StartInfo.FileName = "nbtstat"; process.StartInfo.Arguments = " -a " + strIp; process.StartInfo.UseShellExecute = false; process.StartInfo.CreateNoWindow = true; process.StartInfo.RedirectStandardOutput = true; process.Start(); string output = process.StandardOutput.ReadToEnd().Replace(" ", "").Replace("/n", ""); process.Close(); int length = output.IndexOf("MACAddress="); if (length > 0) { mac =output.Substring(length + 11, 17); } return mac; } } }