问C#平延迟/慢在单点下

EN

using(var sw = new StreamWriter("/ping.txt"))
{
    var ping = new Ping();
    PingReply reply;

    sw.WriteLine("Pre ping: {0}", DateTime.Now);
    // Ping local machine
    reply = ping.Send("172.16.1.100", 60);
    sw.WriteLine("Post ping: {0}", DateTime.Now);

    if (reply != null && reply.Status == IPStatus.Success)
    {
        sw.WriteLine("Success! RTT: {0}", reply.RoundtripTime);
    }

    sw.WriteLine("Pre ping: {0}", DateTime.Now);
    // Ping Google
    reply = ping.Send("216.58.220.110", 60);
    sw.WriteLine("Post ping: {0}", DateTime.Now);

    if (reply != null && reply.Status == IPStatus.Success)
    {
        sw.WriteLine("Success! RTT: {0}", reply.RoundtripTime);
    }
}

private void PingAsyncTest()
{
    var ipAddresses = new List<String> { "172.16.1.100", "216.58.220.110" };

    foreach (var ipAddress in ipAddresses)
    {
        using (var ping = new Ping())
        {
            ping.PingCompleted += PingCompleted;
            ping.SendAsync(IPAddress.Parse(ipAddress), 1000);
        }
    }
}

private void PingCompleted(object sender, PingCompletedEventArgs e)
{
    if (e.Reply.Status == IPStatus.Success)
    {
        // Update successful ping in the DB.
    }
}