Marshal.SizeOf & arrays - struct vs class

[paul]

Hello,

(code below).

The size of MyCollection is 20, but when I change class MyObject to
struct MyObject, the size is 50 (which is what I expect). I understand
this is because structs are value type, where as when I have it as a
class, the array will be references.

However, it must have something to do with the array, as if I do:

public MyObject myObject1;
public MyObject myObject2;
public MyObject myObjectn;

I get the correct size whether it's a struct or a class.

Is there a way to keep class MyObject and have Marshal.SizeOf( ) return
50 (i.e any other attributes I'm not aware of) with an array of my own
types? If not, could you explain why?

Thanks,

Paul

// size wants to be 10 * 5 = 50
// reported size is 4 * 5 = 20 when using class

[StructLayout( LayoutKind.Sequ ential )]
class MyObject
{
[MarshalAs( UnmanagedType.B yValTStr, SizeConst=10 )]
public string myName;
}

[StructLayout( LayoutKind.Sequ ential )]
class MyCollection
{
[MarshalAs( UnmanagedType.B yValArray, SizeConst=5 )]
public MyObject[] myObjects;
}

....

int n = Marshal.SizeOf( typeof( MyCollection ) );