機器字節順序

Problem

Determine the endianess of a computer

Solution

using System;
using System.Runtime.InteropServices;

namespace Endianess
{
    [StructLayout(LayoutKind.Explicit)]
    struct Union
    {
        [FieldOffset(0)]
        public int i;
        [FieldOffset(0)]
        public byte b;
    }

    class Program
    {
        static bool IsLittleEndian1()
        {
            Union u;
            u.b = 0;
            u.i = 1;

            return (u.b == 1) ? true : false;
        }

        static bool IsLittleEndian2()
        {
            return BitConverter.IsLittleEndian;
        }

        static void Main(string[] args)
        {
            if (Program.IsLittleEndian1())
            {
                Console.WriteLine("Little Endianess - Method 1");
            }
            else
            {
                Console.WriteLine("Little Endianess - Method 1");
            }

            if (Program.IsLittleEndian2())
            {
                Console.WriteLine("Little Endianess - Method 2");
            }
            else
            {
                Console.WriteLine("Little Endianess - Method 2");
            }
        }
    }
}

Output

Little Endianess - Method 1
Little Endianess - Method 2
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