ping 网络上的主机名

Posted 2023-02-16

【中文标题】ping 网络上的主机名

【英文标题】：Ping a hostname on the network

【发布时间】：2011-04-11 00:33:41

【问题描述】：

如何 ？

【参考方案1】：

System.Net.NetworkInformation 命名空间是您所需要的。 这个link有更多细节

public static string PingHost(string host)

    //string to hold our return messge
    string returnMessage = string.Empty;

    //IPAddress instance for holding the returned host
    IPAddress address = GetIpFromHost(ref host);

    //set the ping options, TTL 128
    PingOptions pingOptions = new PingOptions(128, true);

    //create a new ping instance
    Ping ping = new Ping();

    //32 byte buffer (create empty)
    byte[] buffer = new byte[32];

    //first make sure we actually have an internet connection
    if (HasConnection())
    
        //here we will ping the host 4 times (standard)
        for (int i = 0; i < 4; i++)
        
            try
            
                //send the ping 4 times to the host and record the returned data.
                //The Send() method expects 4 items:
                //1) The IPAddress we are pinging
                //2) The timeout value
                //3) A buffer (our byte array)
                //4) PingOptions
                PingReply pingReply = ping.Send(address, 1000, buffer, pingOptions);

                //make sure we dont have a null reply
                if (!(pingReply == null))
                
                    switch (pingReply.Status)
                    
                        case IPStatus.Success:
                            returnMessage = string.Format("Reply from 0: bytes=1 time=2ms TTL=3", pingReply.Address, pingReply.Buffer.Length, pingReply.RoundtripTime, pingReply.Options.Ttl);
                            break;
                        case IPStatus.TimedOut:
                            returnMessage = "Connection has timed out...";
                            break;
                        default:
                            returnMessage = string.Format("Ping failed: 0", pingReply.Status.ToString());
                            break;
                    
                
                else
                    returnMessage = "Connection failed for an unknown reason...";
            
            catch (PingException ex)
            
                returnMessage = string.Format("Connection Error: 0", ex.Message);
            
            catch (SocketException ex)
            
                returnMessage = string.Format("Connection Error: 0", ex.Message);
            
        
    
    else
        returnMessage = "No Internet connection found...";

    //return the message
    return returnMessage;

【讨论】：

您能否在此处包含 GetIpFromHost 方法的源代码？ （我知道它在链接中，但如果没有它，答案就无法真正起作用。）谢谢。

实际上，经过仔细检查，它看起来像是用以下内容替换该行：“var address = Dns.GetHostEntry(host).AddressList.First();”已经足够好了——它不会再吞下有价值的例外。

HasConnection() 未定义。

似乎对于 IP v6 地址，pingReply.Options 为空

为我工作，新的 Uri(host).Host 是主机地址，HasConnection() 是 System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()。 BTW IMO 返回 pingStatus 并抛出异常更好。

【参考方案2】：

我会使用Ping 类。

【讨论】：

回想起来，你让它看起来很明显。

是的，我知道。不过，我在发布之前等待确保答案被接受。

【参考方案3】：

试试这个

 using System;
using System.Net;
using System.Net.NetworkInformation;
using System.Text;

namespace Examples.System.Net.NetworkInformation.PingTest

    public class PingExample
    
        // args[0] can be an IPaddress or host name.
        public static void Main (string[] args)
        
            Ping pingSender = new Ping ();
            PingOptions options = new PingOptions ();

            // Use the default Ttl value which is 128,
            // but change the fragmentation behavior.
            options.DontFragment = true;

            // Create a buffer of 32 bytes of data to be transmitted.
            string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
            byte[] buffer = Encoding.ASCII.GetBytes (data);
            int timeout = 120;
            PingReply reply = pingSender.Send (args[0], timeout, buffer, options);
            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);
            
        
    

【讨论】：

请参考您的代码sn-p。这只是 MSDN 链接的副本。