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Design Pattern in .NET 101 – Abstract Factory Pattern (Creational Pattern) »

Download Sample Code Abstract Factory pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes. E.g. I have a DocumentFactory class that either returns DefaultDocumentFactory or CustomDocumentFactory dependening on the environment variable. using System; using System.Collections.Generic; using System.Text; namespace AbstractFactory { abstract class DocumentFactory { public static DocumentFactory [...]

Design Pattern in .NET 101 – Abstract Factory Pattern (Creational Pattern) »

Download Sample Code Abstract Factory pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes. E.g. I have a DocumentFactory class that either returns DefaultDocumentFactory or CustomDocumentFactory dependening on the environment variable. using System; using System.Collections.Generic; using System.Text; namespace AbstractFactory { abstract class DocumentFactory { public static DocumentFactory [...]

Design Pattern in .NET 101 – Factory Method Pattern (Creational Pattern) »

Download Sample Code Factory Method Pattern defines an interface for creating an object, but let subclasses decide which class to instantiate. It lets a class defer instantiation to subclasses. E.g., I defined a abstract News class. using System; using System.Collections.Generic; using System.Text; namespace FactoryPattern { abstract class News { } } Different kinds of news [...]

Design Pattern in .NET 101 – Facade Pattern (Structural Pattern) »

Download Sample Code Facade Pattern provides a unified interface to a set of interfaces in a subsystem. It defines a higher-level interface that makes the subsystem easier to use. E.g. I have a Call Details Record (CDR) to be processed by different systems. It is defined in the CDR class using System; using System.Collections.Generic; using [...]

Design Pattern in .NET 101 – Decorator Pattern (Structural Pattern) »

Download Sample Code Decorator Pattern attaches additional responsibilities to an object dynamically and provides a flexible alternative to subclassing for extending functionality. E.g. BaseMessage is defined using System; using System.Collections.Generic; using System.Text; namespace DecoratorPattern { abstract class BaseMessage { private string sender; private string recipient; public string Sender { get { return this.sender; } set [...]

Design Pattern in .NET 101 – Proxy Pattern (Structural Pattern) »

Download Sample Code Proxy Pattern provides a surrogate or placeholder for another object to control access to it. E.g. I defined a IGreeting interface using System; using System.Collections.Generic; using System.Text; namespace ProxyPattern { interface IGreeting { void SayHello(); } } Greeting implements IGreeting using System; using System.Collections.Generic; using System.Text; namespace ProxyPattern { class Greeting: IGreeting [...]