使用C#绕过主机文件中的别名获取完全限定域名

using System;
using System.Net;

class Program
{
    static void Main()
    {
        string hostname = "example.com";

        try
        {
            IPHostEntry hostEntry = Dns.GetHostEntry(hostname);

            Console.WriteLine("IP Addresses for {0}:", hostname);
            foreach (IPAddress address in hostEntry.AddressList)
            {
                Console.WriteLine(address);
            }

            Console.WriteLine("Aliases for {0}:", hostname);
            foreach (string alias in hostEntry.Aliases)
            {
                Console.WriteLine(alias);
            }

            // 获取完全限定域名
            IPHostEntry fqdnHostEntry = Dns.GetHostEntry(hostEntry.AddressList[0]);
            Console.WriteLine("Fully Qualified Domain Name (FQDN) for {0}: {1}", hostname, fqdnHostEntry.HostName);
        }
        catch (Exception e)
        {
            Console.WriteLine("Error: " + e.Message);
        }
    }
}