How To Check IP with Given IP Range on LINQ C#

Question

I've an SQL Query like

WHERE Network <= @ipaddress AND LastIp >= @ipaddress  

and i need to convert it to LINQ Query. Network and LastIp columns are string. I'm receiving @ipaddress from input at application.

string.Compare(ip.Network,ipAddress) == -1
&& string.Compare(ip.LastIp,ipAddress) == 1 

is it okey to use string.Compare or is there another and much safer way to do that? So thankful for any help.

PS: Need to compare directly into LINQ Query with Repository Context. So i tried to use IpAddress function but it gave the LINQ Expression error.

Answer 1

You can convert IP to uint using the following function:

  public uint IpAddressToUint(string ipAddress)
  {
      var address = IPAddress.Parse(ipAddress);
      byte[] bytes = address.GetAddressBytes();
      return BitConverter.ToUInt32(bytes, 0);
  }

and compare uints:

IpAddressToUint(ip.Network) <= IpAddressToUint(ipAddress) && 
IpAddressToUint(ip.LastIp) >= IpAddressToUint(ipAddress)