如何显示IPv4地址而不是IPv6

Question

I am having this problem, I wrote a small app to display the computers hostname and IP address.

Hostname horks no problem, the issue I am sitting with is...

On some Windows 7 / 8 computers is displays the IPv6 Frown | :(

How do I force to only return IPv4 everytime?

This is my Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;

namespace IPChecker
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

   private void Form1_Load(object sender, EventArgs e)
   {
     label1.Text = "Host Computer: " + Dns.GetHostName();
     foreach (IPAddress address in Dns.GetHostAddresses(Dns.GetHostName()))
     {
       label2.Text = "IP Address: " + address;
     }
   }
  }
}

Answer 1

Try this..

Declare a String..

public static string Ipv4() 
    {
        string ipv4Address = String.Empty;

        foreach (IPAddress currentIPAddress in Dns.GetHostAddresses(Dns.GetHostName()))
        {
            if (currentIPAddress.AddressFamily.ToString() == System.Net.Sockets.AddressFamily.InterNetwork.ToString())
            {
                ipv4Address = currentIPAddress.ToString();
                break;
            }
        }

        return ipv4Address;
    }

Answer 2

Have you tried with an empty hostname ?

Following MSDN ( http://msdn.microsoft.com/en-us/library/system.net.dns.gethostaddresses(v=vs.110).aspx ) :

When an empty string is passed as the host name, this method returns the IPv4 addresses of the local host for all operating systems except Windows Server 2003; for Windows Server 2003, both IPv4 and IPv6 addresses for the local host are returned.