昏睡領域

using System.Net.NetworkInformation;

public static class NetworkInterfaceUtility
{
    // GetOperationalStatus
    public static OperationalStatus GetOperationalStatus(string macAddress)
    {
        #region Require

        if (string.IsNullOrEmpty(macAddress) == true) throw new ArgumentNullException();

        #endregion
        return GetOperationalStatus(PhysicalAddress.Parse(macAddress));
    }

    public static OperationalStatus GetOperationalStatus(PhysicalAddress macAddress)
    {
        #region Require

        if (macAddress == null) throw new ArgumentNullException();

        #endregion
        foreach (NetworkInterface networkInterface in NetworkInterface.GetAllNetworkInterfaces())
        {
            if (PhysicalAddress.Equals(macAddress, networkInterface.GetPhysicalAddress()) == true)
            {
                return networkInterface.OperationalStatus;
            }
        }
        return OperationalStatus.Unknown;
    }
}