How here only A class method is accessible ?

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C#

namespace ConsoleApplication1
{
    class A
    {
        public void Amethod()
        {
            Console.WriteLine("Amethod");
        }
    }

    class B : A
    {
        public new void Bmethod()
        {
            Console.WriteLine("Bmethod");
        }
    }




    class Program
    {
        static void Main()
        {

            A ref2 = new B();

            ref2.Amethod(); // how here only A class method is accessible ? Please explain

            B ref3 = new B();

            ref3.Amethod();
            ref3.Bmethod();

        }
    }
}

In the above code, how here only A class method is accessible? Please explain.

Posted 1-Jul-13 20:58pm

anbujeremiah

Updated 1-Jul-13 21:08pm

lukeer

v2

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OriginalGriff · Answer 1 · 2013-07-01T21:07:00

Because your variable ref2 is declared as a type A, the compiler will only access A class properties and methods - because despite you assigning a B instance to it in this case, ref2 is not a B. It contains an instance of B, because you don't change it, but that may not last.

You are perfectly at liberty to change it later to a A class instance.

It's a bit like going shopping: is A is Vegetable and B is Carrot - because a Carrot is a type of Vegetable you can put "Vegetable" on your shopping list and come back with a Carrot. But you could also come back with a Potato, because that is also a Vegetable. But Potato does not have the "Orange colour" property that Carrot does, so you can't say "Vegetable has Orange colour".