如何知道网络接口何时在c#中使用路由器作为DNS服务器？

using System;
using System.Net.NetworkInformation;

public class NetworkInterfaceExample
{
    public static void Main()
    {
        NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();

        foreach (NetworkInterface networkInterface in interfaces)
        {
            if (networkInterface.OperationalStatus == OperationalStatus.Up)
            {
                IPInterfaceProperties ipProperties = networkInterface.GetIPProperties();
                IPAddressCollection dnsServers = ipProperties.DnsAddresses;

                foreach (IPAddress dnsServer in dnsServers)
                {
                    // 检查DNS服务器是否为路由器的IP地址
                    if (IsRouterDNS(dnsServer))
                    {
                        Console.WriteLine("网络接口 {0} 使用路由器作为DNS服务器。", networkInterface.Name);
                        break;
                    }
                }
            }
        }
    }

    private static bool IsRouterDNS(IPAddress dnsServer)
    {
        // 在这里实现检查DNS服务器是否为路由器的逻辑
        // 可以使用路由器的IP地址进行比较

        return false;
    }
}