深入浅析c#静态多态性与动态多态性

using System;
namespace PolymorphismApplication
{
  class Printdata
  {
   void print(int i)
   {
     Console.WriteLine("Printing int: {0}", i );
   }
   void print(double f)
   {
     Console.WriteLine("Printing float: {0}" , f);
   }
   void print(string s)
   {
     Console.WriteLine("Printing string: {0}", s);
   }
   static void Main(string[] args)
   {
     Printdata p = new Printdata();
     // 调用 print 来打印整数
     p.print(5);
     // 调用 print 来打印浮点数
     p.print(500.263);
     // 调用 print 来打印字符串
     p.print("Hello C#");
     Console.ReadKey();
   }
  }
}

using System;
namespace PolymorphismApplication
{
  abstract class Shape
  {
   public abstract int area();
  }
  class Rectangle: Shape
  {
   private int length;
   private int width;
   public Rectangle( int a=0, int b=0)
   {
     length = a;
     width = b;
   }
   public override int area ()
   { 
     Console.WriteLine("Rectangle 类的面积：");
     return (width * length); 
   }
  }
  class RectangleTester
  {
   static void Main(string[] args)
   {
     Rectangle r = new Rectangle(10, 7);
     double a = r.area();
     Console.WriteLine("面积： {0}",a);
     Console.ReadKey();
   }
  }
}

using System;
namespace PolymorphismApplication
{
  class Shape 
  {
   protected int width, height;
   public Shape( int a=0, int b=0)
   {
     width = a;
     height = b;
   }
   public virtual int area()
   {
     Console.WriteLine("父类的面积：");
     return 0;
   }
  }
  class Rectangle: Shape
  {
   public Rectangle( int a=0, int b=0): base(a, b)
   {
   }
   public override int area ()
   {
     Console.WriteLine("Rectangle 类的面积：");
     return (width * height); 
   }
  }
  class Triangle: Shape
  {
   public Triangle(int a = 0, int b = 0): base(a, b)
   {
   }
   public override int area()
   {
     Console.WriteLine("Triangle 类的面积：");
     return (width * height / 2); 
   }
  }
  class Caller
  {
   public void CallArea(Shape sh)
   {
     int a;
     a = sh.area();
     Console.WriteLine("面积： {0}", a);
   }
  } 
  class Tester
  {
   static void Main(string[] args)
   {
     Caller c = new Caller();
     Rectangle r = new Rectangle(10, 7);
     Triangle t = new Triangle(10, 5);
     c.CallArea(r);
     c.CallArea(t);
     Console.ReadKey();
   }
  }
}