private static async Task <PingResponse[]> PingAsync(string[] hostNameOrAddress, TimeSpan pingTimeout, bool resolveDns, TimeSpan dnsTimeout)
{
var pingResult = await Task.WhenAll(hostNameOrAddress.Select(async x =>
{
// Resolve only when incoming is HostName.
IPAddress ip = null;
DnsResponse resolve = null;
var isIpAddress = IPAddress.TryParse(x, out ip);
if (!isIpAddress)
{
resolve = DnsResolver.ResolveHostName(x, dnsTimeout);
if (resolve.IPAddress == null)
{
resolve = null;
}
else
{
ip = resolve.IPAddress;
}
}
// Execute PingAsync
PingReply reply = null;
using (var ping = new Ping())
{
try
{
reply = await ping.SendPingAsync(ip, (int)pingTimeout.TotalMilliseconds, _buffer, _options);
}
catch
{
// ping throw should never stop operation. just return null.
}
}
// set RoundtripTime
long roundTripTime = 0;
if (reply != null)
{
roundTripTime = reply.RoundtripTime;
}
// set Status
var status = IPStatus.DestinationHostUnreachable;
if (reply != null)
{
status = reply.Status;
}
// set IsSuccess
var isSuccess = status == IPStatus.Success;
// return when PingFailed || HostName || OmitResolveDns
if (!isSuccess || !isIpAddress || !resolveDns)
{
return new PingResponse
{
HostNameOrAddress = x,
IPAddress = ip,
Status = status,
RoundTripTime = roundTripTime,
IsSuccess = isSuccess,
IsResolved = resolve != null,
}
}
;
// Resolve Dns only for success host entry.
var host = x;
resolve = DnsResolver.ResolveIP(ip, dnsTimeout);
if (resolve != null)
{
host = resolve.HostName;
}
return(new PingResponse
{
HostNameOrAddress = host,
IPAddress = ip,
Status = status,
RoundTripTime = roundTripTime,
IsSuccess = true,
IsResolved = resolve != null,
});
}).ToArray());
return(pingResult);
}
private async void CheckStatus()
{
Console.WriteLine("Checking Status...");
boolPinging = true;
listMachinesToPing.Clear();
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (!row.IsNewRow)
{
string computer = row.Cells["ColumnComputer"].Value.ToString();
listMachinesToPing.Add(computer);
}
}
Console.WriteLine("Count: {0}", listMachinesToPing.Count);
if (listMachinesToPing.Count > 0)
{
Console.WriteLine("await PingAsync()");
PingResponse[] arrResponses = null;
TimeSpan ts = new TimeSpan(0, 0, 1);
arrResponses = await NetworkInformationExtensions.PingAsync(listMachinesToPing.ToArray(), ts, false);
foreach (PingResponse response in arrResponses)
{
Console.WriteLine("host: {0}, success?: {1}", response.HostNameOrAddress, response.IsSuccess);
if (response.IsSuccess)
{
UpdateCellText(response.HostNameOrAddress.ToString(), "ColumnStatus", "Online");
}
else
{
string status = "Unavailable";
//resolve?
IPAddress ip = null;
var isIpAddress = IPAddress.TryParse(response.HostNameOrAddress, out ip);
if (!isIpAddress)
{
var resolve = DnsResolver.ResolveHostName(response.HostNameOrAddress, TimeSpan.FromMilliseconds(20));
if (resolve.IPAddress == null)
{
status = "Host not found";
}
}
UpdateCellText(response.HostNameOrAddress, "ColumnStatus", status);
}
}
}
boolPinging = false;
}