Down Casting Rectangles - CSharp Custom Type

CSharp examples for Custom Type:Polymorphism

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Description

Down Casting Rectangles

Demo Code

using System;//from   ww w  . j  a va2  s . c o m
abstract public class Shape
{
   public abstract void DrawYourself();
}
public class Rectangle : Shape
{
   private double height;
   public Rectangle(double initialHeight)
   {
      height = initialHeight;
   }
   public override void DrawYourself()
   {
      Console.WriteLine("Draw a rectangle");
   }
   public double Height
   {
      get
      {
         return height;
      }
      set
      {
         height = value;
      }
   }
}
class Circle : Shape
{
   public override void DrawYourself()
   {
      Console.WriteLine("Draw a circle");
   }
}
class Tester
{
   private static Shape[] drawing;
   public static void Main()
   {
      Rectangle myRectangle;
      double totalHeight = 0;
      drawing = new Shape[3];
      drawing[0] = new Rectangle(10.6);
      drawing[1] = new Circle();
      drawing[2] = new Rectangle(30.8);
      for(int i = 0; i < drawing.Length; i++)
      {
         if(drawing[i] is Rectangle)
         {
            myRectangle = (Rectangle)drawing[i];
            totalHeight += myRectangle.Height;
         }
      }
      Console.WriteLine("Total height of rectangles: {0}", totalHeight);
   }
}

Result


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