WakeOnLan/WakeOnLan/Network.cs

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;

namespace WakeOnLan
{
    public class Network
    {
        public Network()
        {
        }

        public void Send(string macAddr)
        {
            Send(IPAddress.Broadcast, 9, macAddr);
        }

        public void Send(byte[] macAddr)
        {
            Send(IPAddress.Broadcast, 9, macAddr);
        }

        public void Send(IPAddress ipAddr, int port, string macAddr)
        {
            string[] macTmp = macAddr.Split(':');

            if (macTmp.Length != 6)
            {
                Console.WriteLine("Macアドレスが正しくありません。");
                return;
            }

            byte[] mac = new byte[6];

            for (int i = 0; i < macTmp.Length; i++)
            {
                mac[i] = Convert.ToByte(macTmp[i], 16);
            }

            Send(ipAddr, port, mac);
        }
        public void Send(IPAddress ipAddr, int port, byte[] macAddress)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                using (BinaryWriter writer = new BinaryWriter(stream))
                {
                    for (int i = 0; i < 6; i++)
                    {
                        writer.Write((byte)0xff);
                    }

                    for (int i = 0; i < 16; i++)
                    {
                        writer.Write(macAddress);
                    }

                    using (UdpClient client = new UdpClient())
                    {
                        client.EnableBroadcast = true;
                        client.Send(stream.ToArray(), (int) stream.Position, new IPEndPoint(ipAddr, port));
                    }
                }
            }
        }
    }
}