Program.RealWorldCode.cs

using System;
using System.Collections.Generic;

namespace DoFactory.GangOfFour.Prototype.RealWorld
{
    /// <summary>
    /// MainApp startup class for Real-World 
    /// Prototype Design Pattern.
    /// </summary>
    class MainApp
    {
        /// <summary>
        /// Entry point into console application.
        /// </summary>
        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);

            // User clones selected colors
            Color color1 = colormanager["red"].Clone() as Color;
            Color color2 = colormanager["peace"].Clone() as Color;
            Color color3 = colormanager["flame"].Clone() as Color;

            // Wait for user
            Console.ReadKey();
        }
    }

    /// <summary>
    /// The 'Prototype' abstract class
    /// </summary>
    abstract class ColorPrototype
    {
        public abstract ColorPrototype Clone();
    }

    /// <summary>
    /// The 'ConcretePrototype' class
    /// </summary>
    class Color : ColorPrototype
    {
        private int _red;
        private int _green;
        private int _blue;

        // Constructor
        public Color(int red, int green, int blue)
        {
            _red = red;
            _green = green;
            _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 MemberwiseClone() as ColorPrototype;
        }
    }

    /// <summary>
    /// Prototype manager
    /// </summary>
    class ColorManager
    {
        private Dictionary<string, ColorPrototype> _colors =
          new Dictionary<string, ColorPrototype>();

        // Indexer
        public ColorPrototype this[string key]
        {
            get { return _colors[key]; }
            set { _colors.Add(key, value); }
        }
    }
}

//Output:

//Cloning color RGB: 255,  0,  0
//Cloning color RGB: 128,211,128
//Cloning color RGB: 211, 34, 20