private IPEndPoint point; private UdpClient client = new UdpClient(); /**  * 唤醒远程机器方法  * @param  * mac 要唤醒的机器的MAC  * IP  * port udp消息发送端口  *  * 摘要：唤醒方法为网卡提供的魔术封包功能，即以广播模式发送6个FF加上16遍目标MAC地址的字节数组  **/ private void wakeUp(string mac, int port, string ip) {     byte[] magicBytes = getMagicPacket(mac);     point = new IPEndPoint(IPAddress.Parse(ip), port);//广播模式:255.255.255.255     try     {         client.Send(magicBytes, magicBytes.Length, point);     }     catch (SocketException e) { MessageBox.Show(e.Message); } } /// <summary> /// 字符串转16进制字节数组 /// </summary> /// <param name="hexString"></param> /// <returns></returns> public static byte[] strToHexByte(string hexString) {     hexString = hexString.Replace(" ", "");     if ((hexString.Length % 2) != 0)         hexString += " ";     byte[] returnBytes = new byte[hexString.Length / 2];     for (int i = 0; i < returnBytes.Length; i++)         returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);     return returnBytes; } /// <summary> /// 拼装MAC魔术封包 /// </summary> /// <param name="hexString"></param> /// <returns></returns> public static byte[] getMagicPacket(string macString) {     byte[] returnBytes = new byte[102];     string commandString = "FFFFFFFFFFFF";     for (int i = 0; i < 6; i++)         returnBytes[i] = Convert.ToByte(commandString.Substring(i * 2, 2), 16);     byte[] macBytes = strToHexByte(macString);     for (int i = 6; i < 102; i++)     {         returnBytes[i] = macBytes[i % 6];     }     return returnBytes; }