Prototype

// Prototype pattern -- Real World example

using System; using System.Collections; namespace DoFactory.GangOfFour.Prototype.RealWorld {       // MainApp test application    class MainApp   {      static void Main()     {       ColorManager colormanager = new ColorManager();        // Initialize with standard colors       colormanager["red" ] = new Color(255, 0, 0);       colormanager["green"] = new Color( 0, 255, 0);       colormanager["blue" ] = new Color( 0, 0, 255);        // User adds personalized colors       colormanager["angry"] = new Color(255, 54, 0);       colormanager["peace"] = new Color(128, 211, 128);       colormanager["flame"] = new Color(211, 34, 20);       Color color;        // User uses selected colors        string name = "red";       color = colormanager[name].Clone() as Color;       name = "peace";       color = colormanager[name].Clone() as Color;       name = "flame";       color = colormanager[name].Clone() as Color;        // Wait for user       Console.Read();     }   }    // "Prototype"    abstract class ColorPrototype   {      public abstract ColorPrototype Clone();   }    // "ConcretePrototype"    class Color : ColorPrototype   {      private int red;      private int green;      private int blue;      // Constructor      public Color( int red, int green, int blue)     {        this.red = red;        this.green = green;        this.blue = blue;     }      // Create a shallow copy      public override ColorPrototype Clone()     {       Console.WriteLine(         "Cloning color RGB: {0,3},{1,3},{2,3}",         red, green, blue);        return this.MemberwiseClone() as ColorPrototype;     }   }    // Prototype manager    class ColorManager   {     Hashtable colors = new Hashtable();      // Indexer      public ColorPrototype this[ string name]     {        get       {          return colors[name] as ColorPrototype;       }        set       {         colors.Add(name, value);       }     }   } }