C# 虚方法

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虚方法，就是可以在派生类中对其实现进一步改进的方法，也称之为方法覆盖。

示例代码：

using System;using System.Collections.Generic;using System.Text;namespace 虚方法{    class plant      //定义基类    {        public virtual void area()  //定义虚方法area        {        }    }    class rectangle : plant    {        float lg;        float wh;        double ar;        public rectangle(float l,float w)      //定义构造函数，对长和宽进行初始化        {            lg = l;            wh = w;        }        public override void area()           //覆盖基类中的虚方法，计算输出矩形面积        {            ar = lg * wh;            Console.WriteLine("The Area of Rectangle is :" + ar);        }    }    class triangle : plant    {        float hem;        float high;        double ar;        public triangle(float h, float hi)        {            hem = h;            high = hi;        }        public override void area()        {            ar = 0.5 * hem * high;            Console.WriteLine("The area of Triangle is :" + ar);        }    }    class Program    {        static void Main(string[] args)        {            rectangle rec = new rectangle(6, 5);            triangle tri = new triangle(6, 5);            rec.area();            tri.area();        }    }}

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