无法在C#中将域解析为IP？

using System;
using System.Net;

class Program
{
    static void Main()
    {
        string domain = "example.com";
        IPAddress[] addresses = Dns.GetHostAddresses(domain);

        foreach (IPAddress address in addresses)
        {
            Console.WriteLine(address.ToString());
        }
    }
}

using System;
using System.Net;
using System.Net.Sockets;

class Program
{
    static void Main()
    {
        string domain = "example.com";
        IPHostEntry hostEntry = Dns.GetHostEntry(domain);

        foreach (IPAddress address in hostEntry.AddressList)
        {
            Console.WriteLine(address.ToString());
        }
    }
}