Make a method both static and instance [closed]

Question

I have a class called Foo and a static method - Bar (Foo instance) - inside it. But instead of only being able to call it like Foo.Bar(new Foo()), I want to also be able to say new Foo().Bar();

TL;DR I have a static method in class Foo which has a parameter of type Foo and I want to also be able to call it as if it was a non-static method.

^{This is all for testing purposes. I know this'd be terrible code design.}

Answer 1

Create both methods, and let one redirect to other, where main logic is:

public class Foo
{
    // Called by Foo.Bar(new Foo());
    public static void Bar(Foo instance)
    {
        // logic here
    }

    // Called by new Foo().Bar();
    public void Bar()
    {
       Foo.Bar(this);
    }

}