c# ping all machines on local network
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net.NetworkInformation; using System.Diagnostics; using System.Net; using System.Threading; using System.Net.Sockets; namespace ConsoleApplication1 { class Program { static CountdownEvent countdown; static int upCount = 0; static object lockObj = new object(); const bool resolveNames = true; static void Main(string[] args) { countdown = new CountdownEvent(1); Stopwatch sw = new Stopwatch(); sw.Start(); string ipBase = "10.22.4."; for (int i = 1; i < 255; i++) { string ip = ipBase + i.ToString(); Ping p = new Ping(); p.PingCompleted += new PingCompletedEventHandler(p_PingCompleted); countdown.AddCount(); p.SendAsync(ip, 100, ip); } countdown.Signal(); countdown.Wait(); sw.Stop(); TimeSpan span = new TimeSpan(sw.ElapsedTicks); Console.WriteLine("Took {0} milliseconds. {1} hosts active.", sw.ElapsedMilliseconds, upCount); Console.ReadLine(); } static void p_PingCompleted(object sender, PingCompletedEventArgs e) { string ip = (string)e.UserState; if (e.Reply != null && e.Reply.Status == IPStatus.Success) { if (resolveNames) { string name; try { IPHostEntry hostEntry = Dns.GetHostEntry(ip); name = hostEntry.HostName; } catch (SocketException ex) { name = "?"; } Console.WriteLine("{0} ({1}) is up: ({2} ms)", ip, name, e.Reply.RoundtripTime); } else { Console.WriteLine("{0} is up: ({1} ms)", ip, e.Reply.RoundtripTime); } lock(lockObj) { upCount++; } } else if (e.Reply == null) { Console.WriteLine("Pinging {0} failed. (Null Reply object?)", ip); } countdown.Signal(); } } }
