C#•3y ago

Pinging localhost [Answered]

The block below is a method that compiles without issue. However, when I try and pass it localhost:8888 it skips over the pingable = reply.Status == IPStatus.Success line into the catch. Am I passing the argument wrong or do I need a different method to handle local host?

public static bool PingHost(string nameOrAddress)
    {
        bool pingable = false;
        Ping pinger = null;

        try
        {
            pinger = new Ping();
            PingReply reply = pinger.Send(nameOrAddress);
            pingable = reply.Status == IPStatus.Success;
        }
        catch (PingException)
        {
            // Discard PingExceptions and return false;
        }
        finally
        {
            if (pinger != null)
            {
                pinger.Dispose();
            }
        }

        return pingable;
    }

public static bool PingHost(string nameOrAddress)
    {
        bool pingable = false;
        Ping pinger = null;

        try
        {
            pinger = new Ping();
            PingReply reply = pinger.Send(nameOrAddress);
            pingable = reply.Status == IPStatus.Success;
        }
        catch (PingException)
        {
            // Discard PingExceptions and return false;
        }
        finally
        {
            if (pinger != null)
            {
                pinger.Dispose();
            }
        }

        return pingable;
    }

9 Replies

#1AmericanDadFanForLifeOP•3y ago

it isn't a specific exception, as I haven't written one. It just returns false as that is the default value

Pobiega•3y ago

well, try adding a catch(Exception ex) clause for now see if you are getting some other exception

#1AmericanDadFanForLifeOP•3y ago

{"An exception occurred during a Ping request."} + InnerException {"No such host is known"} System.Exception {System.Net.Sockets.SocketException}

Pobiega•3y ago

there we go, and when an exception is thrown inside a try block, it jumps directly to the catch there is no guarantee that all lines in the try runs

#1AmericanDadFanForLifeOP•3y ago

System.Net.NetworkInformation.PingException: An exception occurred during a Ping request. ---> System.Net.Sockets.SocketException: No such host is known
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
   at System.Net.Dns.GetHostAddresses(String hostNameOrAddress)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   --- End of inner exception stack trace ---
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress)
   at CSharpcatcher.PingHost(String nameOrAddress) in C:\Users\alexander.noriega\source\repos\ConsoleApp1\ConsoleApp1\Program.cs:line 22

System.Net.NetworkInformation.PingException: An exception occurred during a Ping request. ---> System.Net.Sockets.SocketException: No such host is known
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
   at System.Net.Dns.GetHostAddresses(String hostNameOrAddress)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   --- End of inner exception stack trace ---
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)
   at System.Net.NetworkInformation.Ping.Send(String hostNameOrAddress)
   at CSharpcatcher.PingHost(String nameOrAddress) in C:\Users\alexander.noriega\source\repos\ConsoleApp1\ConsoleApp1\Program.cs:line 22

here is the full block

Pobiega•3y ago

yeah, pings are ICMP commands if I'm not mistaken as in, there is no port specified

#1AmericanDadFanForLifeOP•3y ago

I see. I suppose that closes this issue then. Thank you.

cap5lut•3y ago

pls use the /close command to mark this thread as answered

Accord•3y ago

✅ This post has been marked as answered!

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Pinging localhost [Answered]