c#中关于结构体和字节数组转化

最近在使用结构体与字节数组转化来实现socket间数据传输。现在开始整理一下。对于Marshal可以查阅msdn，关于字节数组与结构体转代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;
namespace FileSendClient
{

    [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
    struct StructDemo
    {
       
        public byte a;
        public byte c;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
        public byte[] b;
        public byte d;
        public int e;
       
    }
    unsafe class Program
    {
        static void Main(string[] args)
        {
            StructDemo sd;
            sd.a = 0;
            sd.d = 0;
            sd.c = 0;
            sd.b = new byte[3] { 0, 0, 1 };
            sd.e = 5;
            int size = 0;
            //此处使用非安全代码来获取到StructDemo的值
            unsafe
            {
                size = Marshal.SizeOf(sd);
            }
            
            byte[] b = StructToBytes(sd,size);

            ByteToStruct(b, typeof(StructDemo));

        }


        //将Byte转换为结构体类型
        public static byte[] StructToBytes(object structObj,int size)
        {
            StructDemo sd;
            int num = 2;
            byte[] bytes = new byte[size];
            IntPtr structPtr = Marshal.AllocHGlobal(size);
            //将结构体拷到分配好的内存空间
            Marshal.StructureToPtr(structObj, structPtr, false);
            //从内存空间拷贝到byte 数组
            Marshal.Copy(structPtr, bytes, 0, size);
            //释放内存空间
            Marshal.FreeHGlobal(structPtr);
            return bytes;

        }

        //将Byte转换为结构体类型
        public static object ByteToStruct(byte[] bytes, Type type)
        {
            int size = Marshal.SizeOf(type);
            if (size > bytes.Length)
            {
                return null;
            }
            //分配结构体内存空间
            IntPtr structPtr = Marshal.AllocHGlobal(size);
            //将byte数组拷贝到分配好的内存空间
            Marshal.Copy(bytes, 0, structPtr, size);
            //将内存空间转换为目标结构体
            object obj = Marshal.PtrToStructure(structPtr, type);
            //释放内存空间
            Marshal.FreeHGlobal(structPtr);
            return obj;
        }
    }
}