Skip to main content

Abstraction


  • Abstraction refers to the act of representing essential features without including the background details or explanations.
  • Abstraction defines way to abstract or hide your data and members from outside world.
  • Classes use the concept of abstraction and are defined as a list of abstract attributes.
  • Simply speaking Abstraction is hiding the complexities of your class or struct or in a generic term Type from outer world.
  • This is achieved by means of access specifiers.
Access Modifier Description (who can access)
Private Only members within the same type.  (default for type members)
Protected
 Only derived types or members of the same type.
Internal Only code within the same assembly. Can also be code external to object as long as it is in the same assembly.  (default for types)
Protected internal Either code from derived type or code in the same assembly. Combination of protected OR internal.
Public Any code. No inheritance, external type, or external assembly restrictions.

Code Example :

namespace AbstractionExample { public abstract class Shape { private float _area; private float _perimeter; public float Area { get { return _area; } set { _area = value; } } public float Perimeter { get { return _perimeter; } set { _perimeter = value; } } public abstract void CalculateArea(); public abstract void CalculatePerimeter(); } }
Advantages of abstraction are the hiding of implementation details, component reuse, extensibility, and testability. When we hide implementation details, we reveal a cleaner, more comprehensible and usable interface to our users. We are separating our interface from our implementation, and this makes component reuse more practical. Many, if not all of the object-oriented concepts we have discussed throughout this document play a role in the abstraction principle. Working together, their end goal is the same, to produce software that is flexible, testable, maintainable, and extensible.

Comments

Post a Comment

Popular posts from this blog

GRIDVIEW ZOOM IMAGE

When you have images in your  GridView , you would most likely show them as thumbnails so as to not distort the whole layout. However user would want to look at the full image by clicking on the image or just hovering his mouse over it. In today’s applications, this is a basic requirement and there are just so many third party controls or plugins which would support this functionality. I am going do this conventional way using  javascript  way in this article.  On top of it, I am also going to explain how to get images from database using  HttpHandlers . Example: I am using  Adventure Works  as datasource. We fetch handful of products and bind them to the grid. When page is initially loaded, we retrieve products from Production . Product  table and bind them to the grid. We display some product attributes such as Product ID, Product Number, Product Name, List Price and product’s thumbnail. When user hover his mouse on the page, we fetch the f...
Post a Comment
Read more

Editing Child GridView in Nested GridView

Editing Child GridView in Nested GridView In this article we will explore how to edit child gridview in the nested gridview.   Let''s write some code. Step 1:  Add scriptmanager in the aspx page. < asp : ScriptManager   ID ="ScriptManager1"   runat ="server"   EnablePageMethods ="true"> </ asp : ScriptManager > Step 2:  Add below stylesheet for modal popup. < style   type ="text/css">        .modalBackground        {              background-color : Gray;              filter : alpha(opacity=80);              opacity : 0.5;       }        .ModalWindow        {     ...
Post a Comment
Read more

Scrollable GridView with Fixed Headers using jQuery Plugin

Using the same example I have created a jQuery Plugin for Scrollable GridView with Fixed header so that you can directly make a GridView scrollable.   HTML Markup < form   id ="form1"   runat ="server"> < asp : GridView   ID ="GridView1"   runat ="server"   AutoGenerateColumns   =   "false"> < Columns > < asp : BoundField   DataField   =   "ContactName"   HeaderText   =   "Contact Name"   /> < asp : BoundField   DataField   =   "City"   HeaderText   =   "City"   /> < asp : BoundField   DataField   =   "Country"   HeaderText   =   "Country"   /> Columns > asp : GridView > form >   Applying the Scrollable Grid jQuery Plugin < script   src ="Scripts/jquery-1.4.1.min.js"   type ="text/javascript"> script > < script   src ="Scripts/Scro...
Post a Comment
Read more