1 using System; 2   3 public class Parent 4 { 5     string parentString; 6     public Parent() 7     { 8         Console.WriteLine("Parent Constructor."); 9     }10     public Parent(string myString)11     {12         parentString = myString;13         Console.WriteLine(parentString);14     }15     public void print()16     {17         Console.WriteLine("I'm a Parent Class.");18     }19 }20  21 public class Child : Parent22 {23     public Child() : base("From Derived")24     {25         Console.WriteLine("Child Constructor.");26     }27     public new void print()28     {29         base.print();30         Console.WriteLine("I'm a Child Class.");31     }32     public static void Main()33     {34         Child child = new Child();35         child.print();36         ((Parent)child).print();37     }38 }

注意new，base。