C#结构体大小问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace Struct
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("结构体大小："+Marshal.SizeOf(new DataSize()));
            Console.ReadKey();
        }

    }
    //可序列化 设置对齐值为1
    //[Serializable, StructLayout(LayoutKind.Sequential, Pack = 1)]  
    public struct DataSize
    {
        public ushort a;//对齐值2
        public char b;//1
        public ushort c;//2
        public uint d;//4
        public char e;//1
        public char f;//1
        public char g;//1
        public int h;//4
    };
}

按照最大的对齐值对齐，上面最大的对齐值为4，2+1=3<4 3+2=5>4,所以a和b占4个，c占4个，d占4个，e,f,g占4个，h占4个共20个字节。若设置对齐值为1，那么直接将所有对齐值相加即可为16.

输出结果

结构体大小：20

 

转载 https://blog.csdn.net/jueduiwudi6/article/details/80721108