Change value inside an (void) extension method

Question

So I have this mock extension method which change a value to another value:

public static void ChangeValue(this int value, int valueToChange)
{
    value = value         


        

Answer 1

int is a struct so it's a value-type. this means that they are passed by value not by reference. Classes are reference-types and they act differently they are passed by reference.

Your option is to create static method like this:

public static void ChangeValue(ref int value, int valueToChange)
{
    value = valueToChange;
}

and use it:

int a = 10;
ChangeValue(ref a, 15);