C#中的协议缓冲区:如何处理盒装值类型

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct ExampleStruct
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
    public byte[] Data;
}

public class Program
{
    public static void Main()
    {
        ExampleStruct example = new ExampleStruct();
        example.Data = new byte[] { 0x01, 0x02, 0x03, 0x04 };

        int size = Marshal.SizeOf(example);
        IntPtr ptr = Marshal.AllocHGlobal(size);

        Marshal.StructureToPtr(example, ptr, false);

        ExampleStruct newExample = (ExampleStruct)Marshal.PtrToStructure(ptr, typeof(ExampleStruct));

        Marshal.FreeHGlobal(ptr);

        Console.WriteLine("Data: " + string.Join(", ", newExample.Data));
    }
}