Question

I have:

A struct

struct Data { int a; int b; }

A class containing the struct

class Packet {
    Data DataStruct;
}

When I now instantiate my class, I assume that the struct lives on the heap.
If I now do something like

SomeClass.Process(new Packet().DataStruct);
SomeClass.Process(new Packet().DataStruct.a);

will it be passed as value?

If not, is there any reason not to make the struct into a class instead?

Answer 1

structs are value types, so it will be passed as value. Classes are reference types.

Everything will be passed as value unless out or ref is specified.