How to find the size of a class in C#

Question

public class A
{
  int x;
  float y;
}

How to find the size of the class in C#. Is there any operator like Sizeof(), which used to be in C++

Answer 1

Short answer:

You dont.

Long answer:

You can only do that if you type has a fixed layout and has no managed members. Structs are fixed by default. Classes can attributed to have a fixed layout.

(I am not showing how, as you really do not need it. It is only important when doing interop.)