Простой пример асинхронного пингования (проверки доступности компьютера в сети) апи-адреса, или домена.
Код
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net.NetworkInformation;
namespace Ping
{
public partial class Form1 : Form
{
// Counts the pings
private int pingsSent;
// Can be used to notify when the operation completes
AutoResetEvent resetEvent = new AutoResetEvent(false);
public Form1()
{
InitializeComponent();
}
private void btnPing_Click(object sender, EventArgs e)
{
// Reset the number of pings
pingsSent = 0;
// Clear the textbox of any previous content
txtResponse.Clear();
txtResponse.Text += "Pinging " + txtIP.Text + " with 32 bytes of data:\r\n\r\n";
// Send the ping
SendPing();
}
private void SendPing()
{
System.Net.NetworkInformation.Ping pingSender = new System.Net.NetworkInformation.Ping();
// Create an event handler for ping complete
pingSender.PingCompleted += new PingCompletedEventHandler(pingSender_Complete);
// Create a buffer of 32 bytes of data to be transmitted.
byte[] packetData = Encoding.ASCII.GetBytes("................................");
// Jump though 50 routing nodes tops, and don't fragment the packet
PingOptions packetOptions = new PingOptions(50, true);
// Send the ping asynchronously
pingSender.SendAsync(txtIP.Text, 5000, packetData, packetOptions, resetEvent);
}
private void pingSender_Complete(object sender, PingCompletedEventArgs e)
{
// If the operation was canceled, display a message to the user.
if (e.Cancelled)
{
txtResponse.Text += "Ping was canceled...\r\n";
// The main thread can resume
((AutoResetEvent)e.UserState).Set();
}
else if (e.Error != null)
{
txtResponse.Text += "An error occured: " + e.Error + "\r\n";
// The main thread can resume
((AutoResetEvent)e.UserState).Set();
}
else
{
PingReply pingResponse = e.Reply;
// Call the method that displays the ping results, and pass the information with it
ShowPingResults(pingResponse);
}
}
public void ShowPingResults(PingReply pingResponse)
{
if (pingResponse == null)
{
// We got no response
txtResponse.Text += "There was no response.\r\n\r\n";
return;
}
else if (pingResponse.Status == IPStatus.Success)
{
// We got a response, let's see the statistics
txtResponse.Text += "Reply from " + pingResponse.Address.ToString() + ": bytes=" + pingResponse.Buffer.Length + " time=" + pingResponse.RoundtripTime + " TTL=" + pingResponse.Options.Ttl + "\r\n";
}
else
{
// The packet didn't get back as expected, explain why
txtResponse.Text += "Ping was unsuccessful: " + pingResponse.Status + "\r\n\r\n";
}
// Increase the counter so that we can keep track of the pings sent
pingsSent++;
// Send 4 pings
if (pingsSent < 4)
{
SendPing();
}
}
}
}
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24 июня 2016, 18:29