Skip to main content

Generics


  • Generics allow us to have type or method which can operate on objects of various types, while providing type safety at the compile time.
  • That means if you define generics class object of type Integer & you are trying to add different type of variable to generic class like String then it will give compile time error.
  • In another sense, if we try to add different types in same list like string and int in a same list then compile time error will be thrown.
  • Generics are available under the namespace System.Collections.Generic.
  • The concept of type parameters is introduce to the .NET Framework with the help of Generics, which makes it possible to design classes & methods which defer the specification of one or more types until that class or method is declared and instantiated by the client code.
public class MyGenericClass { void Add(T val) { } } //Define a class which will consume MyGenericClass class MyGenericClass { static void Main() { // Declare a generic list having int as type MyGenericClass myGenericClassObj1 = new MyGenericClass(); // Declare a generic list of having string as type MyGenericClass myGenericClassObj2 = new MyGenericClass(); } }

Advantages:

  • Generics provide feature of Type Safety & it's performance is faster.
  • Generics can be used to create your own class of collection.
  • Using generic we can create your own generic methods, interfaces, classes, delegates and events.

Comments

Popular posts from this blog

GRIDVIEW GROUPING

When displaying data, we sometimes would like to group data for better user experience or when displaying long list of hierarchal data, we would want to display them in a tree view kind of structure. There is more than way of doing this, but I am going to explain achieving this functionality using  AJAX Collapsible Panel Extender Control . Overview: I am going to use  Adventure Works  as datasource. Every product in  Production.Product  table belongs to a product sub category. We fetch handful of products and the sub categories they belong to from the database. Our objective is to list all the available sub categories and allow user to  expand/collapse  to look/hide the list of products belonging to each subcategory. Database Connection Added following entry under  connectionStrings  element in  web.config . < add   name = "Sql"   connectionString="Data Source=(local); Initial  Catalog = AdventureWorks ...

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...

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        {     ...