this is not good :-(

this works      

public static Int64 ConvertToLong(string ipv4Address)

        {      

      Int64 result = 0;

      if (ipv4Address.Contains(":")) { return result; } // an ipv6 address was passed instead

      IPAddress ipAddress;

      if (IPAddress.TryParse(ipv4Address, out ipAddress))

            {

               byte[] b = ipAddress.GetAddressBytes();    

                result  = (long)(b[0] * 16777216);

                result += (long)(b[1] * 65536);

                result += (long)(b[2] * 256);

                result += (long)(b[3] * 1);

            }

return result;

        }

Norbert

Bonjour,

resultat du test du code existant et deux autre solutions qui fonctionne:

public static Int64 ConvertToLong(string ipv4Address)
{
Int64 result = 0;
ipv4Address = "180.76.5.56";

if (ipv4Address.Contains(":")) { return result; } // an ipv6 address was passed instead

IPAddress ipAddress;

if (IPAddress.TryParse(ipv4Address, out ipAddress))
{
byte[] b = ipAddress.GetAddressBytes();

// old code from Joe

for (int i = 0; i < b.Length; i++)
{
result += (long)(b[i] * Math.Pow(256, i));
}

// ok ci dessous mais ok pour obselet microsoft :-)
Int64 result2 = 0;
result2 = (long)(Math.Pow(256, 3) * b[0]);
result2 += (long)(Math.Pow(256, 2) * b[1]);
result2 += (long)(Math.Pow(256, 1) * b[2]);
result2 += (long)(b[3] * 1);

Int64 result3 = 0;
result3 = (long)(uint)IPAddress.HostToNetworkOrder((int)IPAddress.Parse(ipv4Address).Address);

}

return result;
}

result == 939871412; //ko

result2 == 3024880952; //ok

result3 == 3024880952; //ok

I use result3  to  ipligence lite.

best

Norbert