[英]Using ping in c#
当我用 Windows Ping 远程系统时,它说没有回复,但是当我用 C# ping 时,它说成功。 Windows 正确,设备未连接。 为什么我的代码能够成功 ping 而 Windows 却不能?
这是我的代码:
Ping p1 = new Ping();
PingReply PR = p1.Send("192.168.2.18");
// check when the ping is not success
while (!PR.Status.ToString().Equals("Success"))
{
Console.WriteLine(PR.Status.ToString());
PR = p1.Send("192.168.2.18");
}
// check after the ping is n success
while (PR.Status.ToString().Equals("Success"))
{
Console.WriteLine(PR.Status.ToString());
PR = p1.Send("192.168.2.18");
}
using System.Net.NetworkInformation;
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;
}
在 C# 中使用 ping 是通过使用Ping.Send(System.Net.IPAddress)
方法实现的,该方法对提供的(有效)IP 地址或 URL 运行 ping 请求并获得称为Internet 控制消息协议 (ICMP)的响应) 数据包。 该数据包包含一个 20 字节的标头,其中包含来自接收到 ping 请求的服务器的响应数据。 .Net 框架System.Net.NetworkInformation
命名空间包含一个名为PingReply
的类,该类具有旨在转换ICMP
响应并提供有关被 ping 服务器的有用信息的属性,例如:
下面是一个使用WinForms
的简单示例来演示 ping 在 c# 中的工作原理。 通过在textBox1
中提供有效的 IP 地址并单击button1
,我们创建了一个Ping
类的实例、一个局部变量PingReply
和一个用于存储 IP 或 URL 地址的字符串。 我们将PingReply
分配给 ping Send
方法,然后通过将回复状态与属性IPAddress.Success
状态进行比较来检查请求是否成功。 最后,我们从PingReply
中提取我们需要为用户显示的信息,这在上面已经描述过。
using System;
using System.Net.NetworkInformation;
using System.Windows.Forms;
namespace PingTest1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Ping p = new Ping();
PingReply r;
string s;
s = textBox1.Text;
r = p.Send(s);
if (r.Status == IPStatus.Success)
{
lblResult.Text = "Ping to " + s.ToString() + "[" + r.Address.ToString() + "]" + " Successful"
+ " Response delay = " + r.RoundtripTime.ToString() + " ms" + "\n";
}
}
private void textBox1_Validated(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(textBox1.Text) || textBox1.Text == "")
{
MessageBox.Show("Please use valid IP or web address!!");
}
}
}
}
private async void Ping_Click(object sender, RoutedEventArgs e)
{
Ping pingSender = new Ping();
string host = @"stackoverflow.com";
await Task.Run(() =>{
PingReply reply = pingSender.Send(host);
if (reply.Status == IPStatus.Success)
{
Console.WriteLine("Address: {0}", reply.Address.ToString());
Console.WriteLine("RoundTrip time: {0}", reply.RoundtripTime);
Console.WriteLine("Time to live: {0}", reply.Options.Ttl);
Console.WriteLine("Don't fragment: {0}", reply.Options.DontFragment);
Console.WriteLine("Buffer size: {0}", reply.Buffer.Length);
}
else
{
Console.WriteLine("Address: {0}", reply.Status);
}
});
}
Imports System.Net.NetworkInformation
Public Function PingHost(ByVal nameOrAddress As String) As Boolean
Dim pingable As Boolean = False
Dim pinger As Ping
Dim lPingReply As PingReply
Try
pinger = New Ping()
lPingReply = pinger.Send(nameOrAddress)
MessageBox.Show(lPingReply.Status)
If lPingReply.Status = IPStatus.Success Then
pingable = True
Else
pingable = False
End If
Catch PingException As Exception
pingable = False
End Try
Return pingable
End Function
private void button26_Click(object sender, EventArgs e)
{
System.Diagnostics.ProcessStartInfo proc = new System.Diagnostics.ProcessStartInfo();
proc.FileName = @"C:\windows\system32\cmd.exe";
proc.Arguments = "/c ping -t " + tx1.Text + " ";
System.Diagnostics.Process.Start(proc);
tx1.Focus();
}
private void button27_Click(object sender, EventArgs e)
{
System.Diagnostics.ProcessStartInfo proc = new System.Diagnostics.ProcessStartInfo();
proc.FileName = @"C:\windows\system32\cmd.exe";
proc.Arguments = "/c ping " + tx2.Text + " ";
System.Diagnostics.Process.Start(proc);
tx2.Focus();
}
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