How to Perform Multiple “Pings” in Parallel using C#

Question

I am trying to calculate the average round-trip time for a collection of servers. In order to speed things up, I would like to perform the pings in parallel. I have writte

Answer 1

A solution:

internal class Utils
{
    internal static PingReply Ping (IPAddress address, int timeout = 1000, int ttl = 64)
    {
            PingReply tpr = null;
            var p = new Ping ();
            try {

                tpr = p.Send (address,
                    timeout,
                    Encoding.ASCII.GetBytes ("oooooooooooooooooooooooooooooooo"),
                    new PingOptions (ttl, true));

            } catch (Exception ex) {

                tpr = null;

            } finally {
                if (p != null)
                    p.Dispose ();

                p = null;
            }

            return tpr;
        }

        internal static List PingAddresses (List addresses, int timeout = 1000, int ttl = 64)
        {
            var ret = addresses
                .Select (p => Ping (p, timeout, ttl))
                .Where (p => p != null)
                .Where (p => p.Status == IPStatus.Success)
                .Select (p => p).ToList ();

            return ret;
        }

        internal static Task PingAddressesAsync (List addresses, Action>> endOfPing, int timeout = 1000, int ttl = 64)
        {

            return Task.Factory.StartNew> (() => Utils.PingAddresses (
                addresses, timeout, ttl)).ContinueWith (t => endOfPing (t));

        }   
}

And using:

Console.WriteLine ("start");

Utils.PingAddressesAsync (new List () { 
                    IPAddress.Parse ("192.168.1.1"), 
                    IPAddress.Parse ("192.168.1.13"), 
                    IPAddress.Parse ("192.168.1.49"),
                    IPAddress.Parse ("192.168.1.200")
                }, delegate(Task> tpr) {

                    var lr = tpr.Result;
                    Console.WriteLine ("finish with " + lr.Count.ToString () + " machine found");

                    foreach (var pr in lr) {
                        Console.WriteLine (pr.Address.ToString ());
        }

});

Console.WriteLine ("execute");
Console.ReadLine ();