C# delegate to struct method

Question

I am trying to create a delegate to a struct method for a particular instance. However, it turns out that a new instance of the struct is created and when I call the delegate it performs the method over the newly created instance rather than the original.

static void Main(string[] args)
{
Point A = new Point() { x = 0 };
Action move = A.MoveRight;
move();
//A.x is still zero!
}

struct Point
{
    public int x, y;

    public void MoveRight()
    {
        x++;
    }
}

Actually, what happens in this example is that a new instance of struct Point is created on the delegate creaton and the method when called through the delagate is performed on it.

If I use class instead of the struct the problem is solved, but I want to use a struct. I also know there is a solution with creating an open delegate and passing the struct as the first parameter to a delegate, but this solution seems rather too heavy. Is there any simple solution to this problem?

Answer 1

No, there's no way around this. Do you have a specific reason to use struct? Unless you have a particular need for it, you really should be using class.

Incidentally, you have created a mutable struct (a struct whose values can change), which is, without exaggeration, anathema. You need to be using a class.