c# – 方法重载和多态

class Program
    {
        static void Main(string[] args)
        {
            List<A> myList = new List<A> {new A(),new B(),new C()};

            foreach (var a in myList)
            {
                Render(a);
            }

            Console.ReadKey();
        }

        private static void Render(A o)
        {
            Console.Write("A");
        }

        private static void Render(B b)
        {
            Console.Write("B");
        }

        private static void Render(C c)
        {
            Console.Write("C");
        }
    }

    class A
    {

    }

    class B : A
    {

    }

    class C : A
    {

    }

输出为：AAA

有可能以某种方式使用方法重载,以便输出是：ABC？