using System;

using System.Diagnostics;

​

public class Program

{

    public struct StackArray8

    {

        private byte at0;

        private byte at1;

        private byte at2;

        private byte at3;

        private byte at4;

        private byte at5;

        private byte at6;

        private byte at7;

        public byte this[int i]

        {

            get

            {

                switch (i)

                {

                    case 0:

                        return at0;

                    case 1:

                        return at1;

                    case 2:

                        return at2;

                    case 3:

                        return at3;

                    case 4:

                        return at4;

                    case 5:

                        return at5;

                    case 6:

                        return at6;

                    case 7:

                        return at7;

                }

​

                throw new IndexOutOfRangeException();

            }

​

            set

            {

                switch (i)

                {

                    case 0:

                        at0 = value;

                        break;

                    case 1:

                        at1 = value;

                        break;

                    case 2:

                        at2 = value;

                        break;

                    case 3:

                        at3 = value;

                        break;

                    case 4:

                        at4 = value;

                        break;

                    case 5:

                        at5 = value;

                        break;

                    case 6:

                        at6 = value;

                        break;

                    case 7:

                        at7 = value;

                        break;

                    default:

                        throw new IndexOutOfRangeException();

                }

            }

        }

    }

​

    public static void Main()

    {

        Stopwatch sw = new Stopwatch();

        sw.Start();

        for (int i = 0; i < 100000; i++)

        {

            StackArray8 packetHeader = new StackArray8();

            if (i % 2 == 0)

            {

                packetHeader[0] = 8;

                packetHeader[1] = 7;

                packetHeader[2] = 6;

                packetHeader[3] = 5;

                packetHeader[4] = 4;

                packetHeader[5] = 3;

                packetHeader[6] = 2;

                packetHeader[7] = 1;

            }

            else

            {

                packetHeader[7] = 8;

                packetHeader[6] = 7;

                packetHeader[5] = 6;

                packetHeader[4] = 5;

                packetHeader[3] = 4;

                packetHeader[2] = 3;

                packetHeader[1] = 2;

                packetHeader[0] = 1;

            }

        }

​

        sw.Stop();

        Console.WriteLine("Elapsed={0}", sw.Elapsed);

        sw.Start();

        for (int j = 0; j < 100000; j++)

        {

            byte[] byteHeader = new byte[8];

            if (j % 2 == 0)

            {

                byteHeader[0] = 8;

                byteHeader[1] = 7;

                byteHeader[2] = 6;

                byteHeader[3] = 5;

                byteHeader[4] = 4;

                byteHeader[5] = 3;

                byteHeader[6] = 2;

                byteHeader[7] = 1;

            }

            else

            {

                byteHeader[7] = 8;

                byteHeader[6] = 7;

                byteHeader[5] = 6;

                byteHeader[4] = 5;

                byteHeader[3] = 4;

                byteHeader[2] = 3;

                byteHeader[1] = 2;

                byteHeader[0] = 1;

            }

        }

​

        sw.Stop();

        Console.WriteLine("Elapsed={0}", sw.Elapsed);

    }

}