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2012-02-28T08:33:14.180
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Consider usage of Creational patterns, described in GOF (<a href="http://en.wikipedia.org/wiki/Design_Patterns#Creational_patterns" rel="nofollow">"Gang Of Four"</a>) There are the following ways: 1) If you want to have only one instance of object to be created, use <a href="http://en.wikipedia.org/wiki/Singleton_pattern" rel="nofollow">Singleton</a> There is a good example of thread-safe singleton on <a href="http://msdn.microsoft.com/en-us/library/ff650316.aspx" rel="nofollow">MSDN</a> <blockquote> In this strategy, the instance is created the first time any member of the class is referenced </blockquote> <pre><code>public sealed class Singleton { private static readonly Singleton instance = new Singleton(); private Singleton(){} public static Singleton Instance { get { return instance; } } } </code></pre> 2) If you don't want to specify the exact class to create, use <a href="http://en.wikipedia.org/wiki/Factory_method_pattern" rel="nofollow">Factory method</a> Here is an extract from an article on C#-Corner <a href="http://www.c-sharpcorner.com/uploadfile/kalisk/factory-method-design-pattern-using-C-Sharp/" rel="nofollow">Factory method Design pattern using C#</a> <pre><code>abstract class Factory { public abstract Product GetProduct(); //Factory Method Declaration } class concreteFactoryforProcuct1 : Factory { public override Product GetProduct() //Factory Method Implementation { return new Product1(); } } </code></pre> 3) If there is a group of objects to be created this way, use <a href="http://en.wikipedia.org/wiki/Abstract_factory_pattern" rel="nofollow">Abstract factory</a> Here are extracts from an article on codeproject: <a href="http://www.codeproject.com/Articles/328373/Understanding-and-Implementing-Abstract-Factory-Pa" rel="nofollow">Understanding and implementing abstract factory pattern in C#</a> Creating the Abstract Factory <pre><code>interface IPhoneFactory //'I' stands for interface no relation with Iphone { ISmart GetSmart(); IDumb GetDumb(); } </code></pre> Creating the Concrete Factories <pre><code>class SamsungFactory : IPhoneFactory { public ISmart GetSmart() { return new GalaxyS2(); } public IDumb GetDumb() { return new Primo(); } } ... </code></pre> Creating the Client <pre><code>enum MANUFACTURERS { SAMSUNG, HTC, NOKIA } class PhoneTypeChecker { IPhoneFactory factory; ... public PhoneTypeChecker(MANUFACTURERS m) { m_manufacturer= m; } public void CheckProducts() { switch (m_manufacturer) { case MANUFACTURERS.SAMSUNG: factory = new SamsungFactory(); break; case MANUFACTURERS.HTC: factory = new HTCFactory(); break; case MANUFACTURERS.NOKIA: factory = new NokiaFactory(); break; } ... factory.GetSmart(); factory.GetDumb(); ... } } static void Main(string[] args) { PhoneTypeChecker checker = new PhoneTypeChecker(MANUFACTURERS.SAMSUNG); checker.CheckProducts(); ... } </code></pre> 4) Use you common sense to develop your own design that would satisfy your needs.
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