virtualmethod.cs

这是《ASP.NET编程实作教程》一书中的源文件 如果有此书的朋友不防下载过来参考

using System;
class myShape 
{ 
	public virtual double getArea(){return 0;}
	public virtual void defineShape(double x,double  y){}
	public virtual void defineShape(double x){}
	public double x;
	public double y;
}

class myCircle:myShape
{ 
	public override void  defineShape(double r)
	{
		this.x=r;
	}
	
	public override double getArea()
	{
		return 3.14*this.x*this.x;
	}
}

class myRectangle:myShape
{ 
	public override void  defineShape(double a,double b)
	{
		this.x=a;
		this.y=b;
	}
	
	public override double getArea()
	{
		return this.x*this.y;
	}
}
	 
class virtualMethod 
 { 
 	public static void Main() 
 	{ 
  		double area;
  		myShape shape;
  		
  		shape=new myCircle();
  		shape.defineShape(10);
  		area=shape.getArea();
  		Console.WriteLine("the Area is {0}",area);
  	
  		shape=new myRectangle();
  		shape.defineShape(10,8);
  		area=shape.getArea();
  		Console.WriteLine("the Area is {0}",area);
  		
 	} 
}