C# 获取正在使用的Mac地址

/// <summary>
        /// 获得当前机器的活动中Mac地址，若无联网则返回空""
        /// 需在项目引用中添加 System.Management
        /// </summary>
        /// <returns>mac地址，例如：00-00-00-00-00-00</returns>
        public static string GetNetworkAdpaterID()
        {
            try
            {
                string mac = "";
                ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
                ManagementObjectCollection moc = mc.GetInstances();
                foreach (ManagementObject mo in moc)
                    if ((bool)mo["IPEnabled"] == true)
                    {
                        mac = mo["MacAddress"].ToString();
                        break;
                    }
                moc = null;
                mc = null;
                return mac.Trim().Replace(‘:‘, ‘-‘);
            }
            catch (Exception e)
            {
                return "error:" + e.Message;
            }
        }