egwcorelib/EgwCoreLib.Razor/Data/IpUtils.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace EgwCoreLib.Razor.Data
{
    public class IpUtils
    {
        /// <summary>
        /// Restituisce l'IP v4 locale dato uno degli ip machcina (anche IPV6)
        /// </summary>
        /// <param name="firstIp"></param>
        /// <returns></returns>
        public static string getLocalIpv4(string firstIp)
        {
            string devIp = firstIp;
            IPAddress clientIP = IPAddress.Parse(devIp);
            try
            {
                IPHostEntry GetIPHost = Dns.GetHostEntry(clientIP);
                if (GetIPHost != null)
                {
                    // se trovo + di 1 ip cerco il primo NON IPV6...
                    if (GetIPHost.AddressList.Count() > 1)
                    {
                        foreach (IPAddress item in GetIPHost.AddressList)
                        {
                            if (item.AddressFamily == AddressFamily.InterNetwork)
                            {
                                devIp = item.ToString();
                                break;
                            }
                        }
                    }
                }
            }
            catch
            { }
            return devIp;
        }
    }
}