NetAddresses在Win32_NetworkAdapter查询中始终为null

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.

Answer 2

查看WIn32_NetworkAdapterConfiguration，通过使用Win32_NetworkAdapter中的InterfaceIndex，您应该能够使用分配给该nic的ipaddress获得所需的配置。

Answer 3

There's no such thing as a "real" IP address. Each packet you send is routed to its destination based on the metric of the adapter and the available routing paths. You can guess which IP is primarily being used for internet traffic by doing the following:

1. Order your adapters by metric, lowest first.
2. Prioritise WAN IPs, then 192.168.xx, then 10.xxx, and totally ignore loopback addresses.

This will give you a guess as to the "preferred" address, though it's hardly definitive.