Simple Program of Indexer in Console in ASP.NET using C#

Indexer: Indexer can be termed as location indicators and they are used to access class objects in the same way as array elements are accessed.

Difference between Property and Indexers:

Property	Indexers
Allows Identification by its Name.	Allows Identification by its Signature.
Allows methods to be called as if they were public data members.	Allows elements of an internal collections or an object to be accessed by using an array notation on the object itself.
Allows access through a simple name.	Allows access through an index.
Uses Static or an Instance member	Uses an instance member only
Contains the implicit value parameter	Contains the same formal Parameter list as the indexer.

Indexers have the following feature:

Inheritance: Allows Inheritance, which means a derived class can inherit a base class indexer. Modifier Such as virtual and override are used at the property level, not at the accessor level.
Polymorphism: Allows Polymorphism, which means the derived class can override a base class indexer.
Uniqueness: Provides a signature that uniquely identifies an indexer.
Non Static: Indexers cannot be static. If you declare indexer as static, the compiler will generate an error.

Here is the code for Indexer:

console application

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Indexers
{
class sample
{
string[] name = new string[3];
public string this[int index]
{
get
{
if (index < 0 || index >= name.Length)
{
return null;
}
else
{
return (name[index]);
}
}
set
{
name[index] = value;
}
}
}
class Program
{
static void Main(string[] args)
{
sample s = new sample();
s[0]="Nilesh";
s[1]="Purnima";
s[2]="Chandni";
for (int i = 0; i <= 2; i++)
Console.WriteLine(s[i]);
Console.ReadKey();
}
}
}

Output Of Indexers:

Hope you like it. Have a nice day. Thank you for Reading.

4 Comments

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bhavya garg11y ago
can u pls tell error in this code
bhavya garg11y ago
class Program { static void Main(string[] args) { Lst l = new Lst(); l[0] = "13"; l[1] = "ac"; l[2] = "xz"; //for (int i = 0; i <= l.Count; i++) Console.WriteLine("{0},{1},{2} ", l[0], l[1], l[2]); Console.ReadKey(); } } class Lst { ArrayList arr = new ArrayList(); public object this[int index] { get { return (arr[index]); } set { arr[index] = value; } } } }
Shakti Saxena11y ago
Nice share :)
- Nilesh Jadav11y ago
  Thank you Shakti Saxena