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Design Patterns in .NET

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Viewed:  768 
Posted On:  16/05/2015 04:26:30 
What are Design Patterns?  

 

Design patterns are recurring solution to recurring problems in software architecture.

Three main categories of design patterns.

  1. Creational Patterns: Creational patterns provide ways to instantiate single objects or group of related objects.
  2. Structural Patterns: Structural patterns provide a way to define relationship between classes and objects.
  3. Behavioral Patterns: Behavioral Patterns define ways of communication between classes and objects.

Name of patterns fall in each Category.

Creational Patterns

Abstract Factory: Creates an instance of several families of classes

Builder: Separates object construction from its representation

Factory Method: Creates an instance of several derived classes

Prototype: A fully initialized instance to be copied or cloned

Singleton: A class in which only a single instance can exist
 
Structural Patterns

Adapter:
Match interfaces of different classes.

Bridge: Separates an object's interface from its implementation.

Composite: A tree structure of simple and composite objects.

Decorator: Add responsibilities to objects dynamically.

Façade: A single class that represents an entire subsystem.

Flyweight: A fine-grained instance used for efficient sharing.

Proxy: An object representing another object.
 
Behavioral Patterns

Mediator: Defines simplified communication between classes.

Memento: Capture and restore an object's internal state.

Interpreter: A way to include language elements in a program.

Iterator: Sequentially access the elements of a collection.

Chain of Resp: A way of passing a request between a chain of objects.

Command: Encapsulate a command request as an object.

State: Alter an object's behavior when its state changes.

Strategy: Encapsulates an algorithm inside a class.

Observer: A way of notifying change to a number of classes.

Template Method: Defer the exact steps of an algorithm to a subclass.


Visitor: Defines a new operation to a class without change.

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