using System;namespace 父類子類 {class Person{public Person(){Console.WriteLine("我是父類構造函數");}public virtual void SayHello(){Console.WriteLine("父類SayHello");}}class Son : Person{public Son(){Console.WriteLine("我是子類構造函數");}public override void SayHello(){Console.WriteLine("子類SayHello");}}class Program{static void Main(string[] args){Person p1 = new Person();p1.SayHello();Console.WriteLine("===============================");Son s1 = new Son();s1.SayHello();Console.WriteLine("===============================");Person p2 = new Son();p2.SayHello();Console.WriteLine("===============================");Son s2 = new Son();Person ps2 = (Person)s2;ps2.SayHello();Console.WriteLine("===============================");Person p3 = new Son();Son s3 = (Son)p3;s3.SayHello();Console.WriteLine("===============================");Person p4 = new Person();Son s4 = (Son)p4; //報錯！s4.SayHello();}} }

　運行結果如下:

轉載于:https://www.cnblogs.com/fornet/archive/2013/03/23/2977810.html

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