Question

I am trying to get the active network adapter’s IP address, so that I avoid virtual and other VPN adapters that are not connected at present.

On my current laptop the following code returns 3 IP V4 addresses, and I don’t know how to get the “real”, in use IP address from that list.

        IPAddress[] ipV4Addresses = Array.FindAll(
            Dns.GetHostEntry(String.Empty).AddressList,
            a => a.AddressFamily == AddressFamily.InterNetwork);

Looking at MSDN doc here, I thought maybe I was on the right track. Has anyone obtained the list of IP addresses per adapter successfully? If so, please share your wisdom. Thanks!

This is all prototype at this point. I have this code (thanks to SO!), and the string[] netAddresses is always null, even with the computer connected to a network and with a functioning IP address.

        string wmiQuery = "SELECT * FROM Win32_NetworkAdapter WHERE NetConnectionId != NULL";
        ManagementObjectSearcher moSearch = new ManagementObjectSearcher(wmiQuery);
        ManagementObjectCollection moCollection = moSearch.Get();

        foreach (ManagementObject mo in moCollection)
        {
            Console.WriteLine("{0} is {1}", mo["Name"], mo["NetConnectionStatus"]);
            string[] netAddresses = (string[])mo["NetworkAddresses"];
            if (netAddresses != null)
            {
                foreach (string netAddress in netAddresses)
                {
                    Console.WriteLine("\tnet addresses:");
                    Console.WriteLine("\t\t{0}", netAddress);
                }
            }
        }

Answer 1

from MS docs: http://msdn.microsoft.com/en-us/library/windows/desktop/aa394216%28v=vs.85%29.aspx

NetworkAddresses

Data type: string array
Access type: Read-only

Array of network addresses for an adapter. This property is inherited from CIM_NetworkAdapter.

This property has not been implemented yet. It returns a NULL value by default.