class Program
    {
        static void Main(string[] args)
        {
            Child c = new Child();
            Console.ReadKey();
        }
    }

    public class Parent
    {
        public Parent()
        {
            Console.WriteLine("构造父类！");
        }
    }

    public class Child : Parent
    {
        public Child()
        {
            Console.WriteLine("构造子类！");
        }
    }