Design Patterns

Question

What is the meaning of Design Pattern in ASP.net?

Pankaj Maurya · Answer

Design patterns are solutions to software design problems you find again and again in real-world application development. Patterns are about reusable designs and interactions of objects. Design Patterns are in a continious phase of evolution which means that they keep on getting better & better as they are tested against time reliability and subjected to continious improvements. Further design patterns have evolved towards targeting specific domains. For example windows-based banking applications are usually based on singleton patterns e-commerce web applications are based on the MVC (Model-View-Controller) pattern. There are following 3 type of design patterns based on communicationstructurebehavior of objects . Creational Pattern: It deals with object creation mechanisms. Pattern Description 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 of which only a single instance can exist Structural Patterns: It eases the design by identifying a simple way to realize relationships between entities. Pattern Description 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 Facade 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: It describes how different objects and classes interact with each other to make things happen. Pattern Description Chain of Responsibility A way of passing a request between a chain of objects Command Encapsulate a command request as an object Interpreter A way to include language elements in a program Iterator Sequentially access the elements of a collection Mediator Defines simplified communication between classes Observer A way of notifying change to a number of classes State Alter an object's behavior when its state changes Strategy Encapsulates an algorithm inside a class Template Method Defer the exact steps of an algorithm to a subclass Visitor Defines a new operation to a class without change

Jignesh Trivedi · Answer

a design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. it is not finished design that can be transformed directly into source or machine code. Patterns are formalized best practices that the programmer must implement in the application. http://en.wikipedia.org/wiki/Software_architecture There are many famous design patterns are available with c# http://www.codeproject.com/Articles/28309/Design-pattern-FAQ-Part-1-Training hope this will help you.