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Understanding and Implementing Prototype Pattern in C# - Implementing ICloneable Interface and understanding Shallow and Deep Copy

, 11 Dec 2012
In this article, we saw what is prototype pattern. How can we implement Prototype pattern in C#.
PrototypeDemo.zip
PrototypeDemo
PrototypeDemo
IClonableVersion
Properties
Prototype
ShallownDeepCopy
PrototypeDemo.suo
using System;
using System.Collections.Generic;
using System.Text;

namespace PrototypeDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            // The code to demonstrate the classic Prorotype Pattern
            CJ player = new CJ();
            player.Health = 1;
            player.Felony = 10;
            player.Money = 2.0;

            Console.WriteLine("Original Player stats:");
            Console.WriteLine("Health: {0}, Felony: {1}, Money: {2}", 
                player.Health.ToString(), 
                player.Felony.ToString(), 
                player.Money.ToString());

            // We enter the cheat code here and we have a new 
            // player with his health fully restored.
            CJ playerToSave = player.Clone() as CJ;            

            Console.WriteLine("\nCopy of player to save on disk:");
            Console.WriteLine("Health: {0}, Felony: {1}, Money: {2}", 
                playerToSave.Health.ToString(), 
                playerToSave.Felony.ToString(), 
                playerToSave.Money.ToString());

            PerformShallowCopy();
            
            PerformDeepCopy();

            ICloneableVersionCopy();

        }

        private static void PerformShallowCopy()
        {
            // The code to demonstrate the shallow copy
            CJEx playerEx = new CJEx();
            playerEx.Health = 1;
            playerEx.Felony = 10;
            playerEx.Money = 2.0;
            playerEx.Details.Fitness = 5;
            playerEx.Details.Charisma = 5;

            // Lets clone the above object and change the 
            // proprties of contained object
            CJEx shallowClonedPlayer = playerEx.Clone() as CJEx;
            shallowClonedPlayer.Details.Charisma = 10;
            shallowClonedPlayer.Details.Fitness = 10;

            // Lets see what happened to the original object
            Console.WriteLine("\nOriginal Object:");
            Console.WriteLine("Charisma: {0}, Fitness: {1}",
                playerEx.Details.Charisma.ToString(),
                playerEx.Details.Fitness.ToString());
            Console.WriteLine("\nShallow Cloned Object:");
            Console.WriteLine("Charisma: {0}, Fitness: {1}",
                shallowClonedPlayer.Details.Charisma.ToString(),
                shallowClonedPlayer.Details.Fitness.ToString());
        }

        private static void PerformDeepCopy()
        {
            // Let us see how we can perform the deep copy now
            CJEx playerEx2 = new CJEx();
            playerEx2.Health = 1;
            playerEx2.Felony = 10;
            playerEx2.Money = 2.0;
            playerEx2.Details.Fitness = 5;
            playerEx2.Details.Charisma = 5;

            // lets clone the object but this time perform a deep copy
            CJEx shallowClonedPlayer2 = playerEx2.Clone() as CJEx;
            shallowClonedPlayer2.Details.Charisma = 10;
            shallowClonedPlayer2.Details.Fitness = 10;

            // Lets see what happened to the original object
            Console.WriteLine("\nOriginal Object:");
            Console.WriteLine("Charisma: {0}, Fitness: {1}",
                playerEx2.Details.Charisma.ToString(),
                playerEx2.Details.Fitness.ToString());
            Console.WriteLine("\nDeep Cloned Object:");
            Console.WriteLine("Charisma: {0}, Fitness: {1}",
                shallowClonedPlayer2.Details.Charisma.ToString(),
                shallowClonedPlayer2.Details.Fitness.ToString());
        }

        private static void ICloneableVersionCopy()
        {
            // Let us see how we can perform the deep copy now
            CJFinal player = new CJFinal();
            player.Health = 1;
            player.Felony = 10;
            player.Money = 2.0;
            player.Details.Fitness = 5;
            player.Details.Charisma = 5;

            // lets clone the object but this time perform a deep copy
            CJFinal clonedPlayer = player.Clone() as CJFinal;
            clonedPlayer.Details.Charisma = 10;
            clonedPlayer.Details.Fitness = 10;

            // Lets see what happened to the original object
            Console.WriteLine("\nOriginal Object:");
            Console.WriteLine("Charisma: {0}, Fitness: {1}",
                player.Details.Charisma.ToString(),
                player.Details.Fitness.ToString());
            Console.WriteLine("\nICloneable Deep Cloned Object:");
            Console.WriteLine("Charisma: {0}, Fitness: {1}",
                clonedPlayer.Details.Charisma.ToString(),
                clonedPlayer.Details.Fitness.ToString());
        }
    }
}

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About the Author

Rahul Rajat Singh
Software Developer (Senior)
India India
I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.
  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4
 
If you like my articles, please visit my website for more: www.rahulrajatsingh.com[^]
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