我正在运行一个服务器,我想显示我自己的IP地址。

获取计算机自身(如果可能的话,外部)IP地址的语法是什么?

有人编写了以下代码。

IPHostEntry host;
string localIP = "?";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
    if (ip.AddressFamily.ToString() == "InterNetwork")
    {
        localIP = ip.ToString();
    }
}
return localIP;

然而,我通常不信任作者,我不理解这段代码。有更好的方法吗?


当前回答

using System.Net;

string host = Dns.GetHostName();
IPHostEntry ip = Dns.GetHostEntry(host);
Console.WriteLine(ip.AddressList[0].ToString());

刚在我的机器上测试过了,还能用。

其他回答

WebClient webClient = new WebClient();
string IP = webClient.DownloadString("http://myip.ozymo.com/");
return Dns.GetHostEntry(Dns.GetHostName()).AddressList.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);

简单的一行代码,返回第一个内部IPV4地址,如果没有则返回null。作为上面的注释添加,但可能对某人有用(上面的一些解决方案将返回多个需要进一步过滤的地址)。

它也很容易返回环回而不是null,我猜用:

return Dns.GetHostEntry(Dns.GetHostName()).AddressList.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork) ?? new IPAddress( new byte[] {127, 0, 0, 1} );

不,这几乎是最好的方法。由于一台机器可能有多个IP地址,您需要迭代它们的集合以找到合适的一个。

编辑:我唯一想改变的是改变这个:

if (ip.AddressFamily.ToString() == "InterNetwork")

:

if (ip.AddressFamily == AddressFamily.InterNetwork)

不需要ToString一个枚举进行比较。

如果你想避免使用DNS:

List<IPAddress> ipList = new List<IPAddress>();
foreach (var netInterface in NetworkInterface.GetAllNetworkInterfaces())
{
    foreach (var address in netInterface.GetIPProperties().UnicastAddresses)
    {
        if (address.Address.AddressFamily == AddressFamily.InterNetwork)
        {
            Console.WriteLine("found IP " + address.Address.ToString());
            ipList.Add(address.Address);
        }
    }
}
namespace NKUtilities 
{
    using System;
    using System.Net;

    public class DNSUtility
    {
        public static int Main (string [] args)
        {

          String strHostName = new String ("");
          if (args.Length == 0)
          {
              // Getting Ip address of local machine...
              // First get the host name of local machine.
              strHostName = Dns.GetHostName ();
              Console.WriteLine ("Local Machine's Host Name: " +  strHostName);
          }
          else
          {
              strHostName = args[0];
          }

          // Then using host name, get the IP address list..
          IPHostEntry ipEntry = DNS.GetHostByName (strHostName);
          IPAddress [] addr = ipEntry.AddressList;

          for (int i = 0; i < addr.Length; i++)
          {
              Console.WriteLine ("IP Address {0}: {1} ", i, addr[i].ToString ());
          }
          return 0;
        }    
     }
}