c# - 如何用对象数组编组对象？

Question

我在编组方面遇到问题。

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public class Book
    {

        [MarshalAs(UnmanagedType.LPArray, SizeConst = 1000)]
        public Page[] astInject2;
    }

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public class Page
    {
        public int n;
    }

为什么调用Marshal.SizeOf(typeof(Book))会引发 ArgumentException：

Type 'Book' cannot be marshaled as an unmanaged structure; no  meaningful size or offset can be computed.

?

有什么解决办法吗？

我正在将 Book 对象编组为 C++ 结构。

如果我这样做：

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct Book
    {

        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1000)]
        public Page[] astInject2;
    }

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct Page
    {
        public int n;
    }

然后Marshal.SizeOf(typeof(Book))按应有的方式返回 4000。请注意，我不能将 Book 定义为结构，它必须是类。