wol/WoL/WoL/WoL.cs

using System;
using System.Globalization;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text.RegularExpressions;

namespace WakeOnLan
{
	public class WoL
	{
		private const int WOL_PACKET_LEN = 102;

		public static void Wake(string ip, string macAddress)
		{
			byte[] wolBuffer = GetWolPacket(macAddress);

			UdpClient udp = new UdpClient();
			udp.EnableBroadcast = true;

			IPAddress ipAddress = IPAddress.Parse(ip);
			udp.Send(wolBuffer, wolBuffer.Length, ipAddress.ToString(), 7);
			udp.Send(wolBuffer, wolBuffer.Length, ipAddress.ToString(), 9);
		}

		private static byte[] GetWolPacket(string macAddress)
		{
			byte[] datagram = new byte[WOL_PACKET_LEN];
			byte[] macBuffer = StringToBytes(macAddress);

			using (MemoryStream ms = new MemoryStream(datagram))
			{
				BinaryWriter bw = new BinaryWriter(ms);
				for (int i = 0; i < 6; i++)
				{
					bw.Write((byte)0xff);
				}

				for (int i = 0; i < 16; i++)
				{
					bw.Write(macBuffer, 0, macBuffer.Length);
				}
			}

			return datagram;
		}

		private static byte[] StringToBytes(string macAddress)
		{
			macAddress = Regex.Replace(macAddress, "[-|:]", "");
			byte[] buffer = new byte[macAddress.Length / 2];

			for (int i = 0; i < macAddress.Length; i += 2)
			{
				string digit = macAddress.Substring(i, 2);
				buffer[i / 2] = byte.Parse(digit, NumberStyles.HexNumber);
			}

			return buffer;
		}
	}
}