关键代码：       

        /// <summary>
        /// 根据网卡类型来获取mac地址
        /// </summary>
        /// <param name="networkType">网卡类型</param>
        /// <param name="macAddressFormatHanlder">格式化获取到的mac地址</param>
        /// <returns>获取到的mac地址</returns>
        public static string GetMacAddress(NetworkInterfaceType networkType, Func<string, string> macAddressFormatHanlder)
        {
            string _mac = string.Empty;
            NetworkInterface[] _networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface adapter in _networkInterfaces)
            {
                if (adapter.NetworkInterfaceType == networkType)
                {
                    _mac = adapter.GetPhysicalAddress().ToString();
                    if (!String.IsNullOrEmpty(_mac))
                        break;
                }
            }
            if (macAddressFormatHanlder != null)
                _mac = macAddressFormatHanlder(_mac);
            return _mac;
        }
        /// <summary>
        /// 根据网卡类型以及网卡状态获取mac地址
        /// </summary>
        /// <param name="networkType">网卡类型</param>
        /// <param name="status">网卡状态</param>
        ///Up 网络接口已运行，可以传输数据包。 
        ///Down 网络接口无法传输数据包。 
        ///Testing 网络接口正在运行测试。 
        ///Unknown 网络接口的状态未知。 
        ///Dormant 网络接口不处于传输数据包的状态；它正等待外部事件。 
        ///NotPResent 由于缺少组件（通常为硬件组件），网络接口无法传输数据包。 
        ///LowerLayerDown 网络接口无法传输数据包，因为它运行在一个或多个其他接口之上，而这些“低层”接口中至少有一个已关闭。 
        /// <param name="macAddressFormatHanlder">格式化获取到的mac地址</param>
        /// <returns>获取到的mac地址</returns>
        public static string GetMacAddress(NetworkInterfaceType networkType, OperationalStatus status, Func<string, string> macAddressFormatHanlder)
        {
            string _mac = string.Empty;
            NetworkInterface[] _networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface adapter in _networkInterfaces)
            {
                if (adapter.NetworkInterfaceType == networkType)
                {
                    if (adapter.OperationalStatus != status) continue;
                    _mac = adapter.GetPhysicalAddress().ToString();
                    if (!String.IsNullOrEmpty(_mac)) break;
                }
            }
            if (macAddressFormatHanlder != null)
                _mac = macAddressFormatHanlder(_mac);
            return _mac;
        }
        /// <summary>
        /// 获取读到的第一个mac地址
        /// </summary>
        /// <returns>获取到的mac地址</returns>
        public static string GetMacAddress(Func<string, string> macAddressFormatHanlder)
        {
            string _mac = string.Empty;
            NetworkInterface[] _networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface adapter in _networkInterfaces)
            {
                _mac = adapter.GetPhysicalAddress().ToString();
                if (!string.IsNullOrEmpty(_mac))
                    break;
            }
            if (macAddressFormatHanlder != null)
                _mac = macAddressFormatHanlder(_mac);
            return _mac;
        }