Csharp/C Sharp/Design Patterns/Factory Pattern

Factory Method Pattern

<source lang="csharp"> using System; using System.Collections; public abstract class Module {

   public abstract void SomeModule();

} public class FeaturesModule : Module {

   public override void SomeModule() {
       Console.WriteLine("Technical content.");
   }
   public FeaturesModule() {}

} public class InstructionModule : Module {

   public override void SomeModule() {
       Console.WriteLine("Instruction content.");
   }
   public InstructionModule() {}

} public class PictureModule : Module {

   public override void SomeModule() {
       Console.WriteLine("Picture content.");
   }
   public PictureModule() {}

}

public class TechnicalModule : Module {

   public override void SomeModule() {
       Console.WriteLine("Technical content.");
   }
   public TechnicalModule() {}

}

public abstract class Page {

   protected ArrayList pageCompositor = new ArrayList();
   public abstract void AddModule();
   public abstract void DisplayPage();

}

public class CatalogPage : Page {

   public override void AddModule() {
       this.pageCompositor.Clear();
       this.pageCompositor.Add(new FeaturesModule());
       this.pageCompositor.Add(new PictureModule());
   }
   public override void DisplayPage() {
       foreach (Module c in this.pageCompositor)
           c.SomeModule();
   }

   public CatalogPage() {
       this.AddModule();
   }

}

public class ManualPage : Page {

   public override void AddModule() {
       this.pageCompositor.Clear();
       this.pageCompositor.Add(new TechnicalModule());
       this.pageCompositor.Add(new PictureModule());
       this.pageCompositor.Add(new InstructionModule());
   }
   public override void DisplayPage() {
       Console.WriteLine("Manual page contains:");
       foreach (Module c in this.pageCompositor)
           c.SomeModule();
       Console.WriteLine();
   }
   public ManualPage() { }

} class Client {

   static void Main(string[] args) {
       Page p = new CatalogPage();
       p.AddModule();
       p.DisplayPage();
       p = new ManualPage();
       p.AddModule();
       p.DisplayPage();
   }

}

</source>