c#多态性

class Program
    {
        static void Main(string[] args)
        {
            //声明一个派生类
            devierExample de = new devierExample();
            de.BaseOutput();
            //声明一个基类
            baseExample be = (baseExample)de;
            be.BaseOutput();
            Console.ReadLine();
        }
        class baseExample
        {
            public string baseName;
            public void BaseOutput()
            {
                Console.WriteLine("base output");
            }
        }
        class devierExample : baseExample
        {
            public string devierName;
            public void BaseOutput()
            {
                Console.WriteLine("devier Output");
            }
        }
    }