忽略我以前发布的内容，我在某种程度上使事情变得过于复杂了！当需要将未知长度的数据进行编组时，可以使用我建议的方法.

如您所知，它很简单:

Ignore what I posted previously, I was somewhat overcomplicating things! The method I suggested can be used when an unknown length of data is required to be marshalled.

As you know the length, it''s simple:

[StructLayout(LayoutKind.Sequential)]
struct Inner
{
    public uint A;
    public byte B;
}

[StructLayout(LayoutKind.Sequential)]
struct Foo
{
    public ushort W;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
    public byte[] X;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
    public Inner[] data;
}

为什么要使用fixed和unsafe?

Why are you using fixed and unsafe?