In this article, you will learn what is List In C#
It is the generic version of the ArrayList that comes under System.Collection.Generic namespace.
The List<T> is a collection of strongly typed objects that can be accessed by index and having methods for searching, sorting,
and modifying the list.
List<T> Characteristics
It comes under System.Collection.Generic namespace.
List<T> equivalent of the ArrayList, which implements IList<T>.
It provides compile-time type checking and doesn't perform boxing-unboxing because it is generic. List<T> can contain elements of the specified type.
Elements can be accessed by passing an index e.g. myList[0]. Indexes start from zero.
Elements can be added using the AddRange(), Add() methods or collection-initializer syntax.
Creating a List
The List<T> is a generic collection, so we need to specify a type parameter for the type of data it can store. The following e.g. shows how to create a list and add elements.
List<int> student = new List<int>();
student.Add(1); // adding elements using add() method
student.Add(2);
student.Add(4);
student.Add(6);//adding elements using collection-initializer syntax
var City = new List<string>()
{
"New Delhi",
"Lucknow",
"Mumbai",
"Noida"
};var city = new List<string>();
city.Add("New Delhi");
city.Add("Lucknow");
city.Add("Mumbai");
city.Add("Noida");
city.Add(null);// nulls are allowed for reference type listIn the above example, List<int> student = new List<int>(); creates a list of int type. In the same way, city and City are string type list.
You can then add elements in a list using the Add() method or the collection-initializer syntax.
// using foreach LINQ method
numbers.ForEach(num => Console.WriteLine(num + ", "));//prints 1, 2, 5, 7, 8, 10,
// using for loop
for(int i = 0; i < numbers.Count; i++)
Console.WriteLine(numbers[i]);
Accessing a List using LINQ
The List<T> implements the IEnumerable interface. We can query a list using LINQ query syntax or method syntax, as shown below.
Example: LINQ Query on List
var students = new List<Student>() {
new Student(){ Id = 1, Name="A"},
new Student(){ Id = 2, Name="B"},
new Student(){ Id = 3, Name="C"},
new Student(){ Id = 4, Name="D"}
};
Example: Accessing List
List<int> numbers = new List<int>() { 1, 2, 5, 7, 8, 10 };
Console.WriteLine(numbers[0]); // prints 1
Console.WriteLine(numbers[1]); // prints 2
Console.WriteLine(numbers[2]); // prints 5
Console.WriteLine(numbers[3]); // prints 7
ex.: Adding elements in List
It is the generic version of the ArrayList that comes under System.Collection.Generic namespace. The List<T> is a collection of strongly typed objects that can be accessed by index and having methods for searching, sorting, and modifying the list.
C# is a programming language developed by Microsoft that runs on the .NET Framework. C# is used to develop web, desktop, mobile, games and much more application.
C# is a object-oriented programming language developed by Microsoft within its .NET Framework. Led by Anders Hejlsberg, your basic C# programming
and will also take you through various advanced concepts related to C# programming language.
C# such as control statements, objects and classes, inheritance, constructor, destructor, this, static, sealed, polymorphism, abstraction, abstract class, interface, File IO, Collections, namespace, encapsulation, properties, indexer, arrays, strings, regex, exception handling, multithreading etc.
For example...
using System;
namespace MinifyCode
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello Minify Code");
}
}
}
Output: Hello Minify Code
In this article you will learn, what is server side controls. We will discuss each of these objects in due time. In this tutorial we will explore the Server object, the Request object, and the Response object.
Session
Application
Cache
Request
Response
Server
User
Trace
Server Object
The Server object in Asp.NET is an instance of the System.Web.HttpServerUtility class. The HttpServerUtility class provides numerous properties and methods to perform many type of jobs.
Methods and Properties of the Server object
The methods and properties of the HttpServerUtility class are exposed through the intrinsic Server object provided by ASP.NET.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Optimization;
using System.Web.Routing;
using System.Web.Security;
using System.Web.SessionState;
using System.Data.Entity;
namespace minifycode
{
public class Global : HttpApplication
{
void Application_Start(object sender, EventArgs e)
{
// Code that runs on application startup
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
// Initialize the product database.
Database.SetInitializer(new ProductDatabaseInitializer());
// Create custom role and user.
RoleActions roleActions = new RoleActions();
roleActions.AddUserAndRole();
// Add Routes.
RegisterCustomRoutes(RouteTable.Routes);
}
void RegisterCustomRoutes(RouteCollection routes)
{
routes.MapPageRoute(
"ProductsCategoryRoute",
"Category/{categoryName}",
"~/ProductList.aspx"
);
routes.MapPageRoute(
"ProductNameRoute",
"Product/{productName}",
"~/ProductDetails.aspx"
);
}
}
}