Answer / supraja

C# introduces a new concept known as Indexers which are
used for treating an object as an array. The indexers are
usually known as smart arrays in C# community. Defining a
C# indexer is much like defining properties. We can say
that an indexer is a member that enables an object to be
indexed in the same way as an array.

The following is syntax

<modifier> <return type> this [argument list]
{
get
{
// Get codes goes here
}
set
{
// Set codes goes here
}
}

Answer / chaitanya.k

Indexers are used to retrieve the data faster than
retrieving the data from Arrays.

Answer / muhammad usman

Indexer is used to treat an object as an array

Answer / jignesh contractor

Indexer Concept is object act as an array.
Indexer an object to be indexed in the same way as an
array.
Indexer modifier can be private, public, protected or
internal.
The return type can be any valid C# types.
Indexers in C# must have at least one parameter. Else the
compiler will generate a compilation error.
this [Parameter]

{

get

{

// Get codes goes here

}

set

{

// Set codes goes here

}

}



For Example:



using System;

using System.Collections.Generic;

using System.Text;



namespace Indexers

{

class ParentClass

{

private string[] range = new string[5];

public string this[int indexrange]

{

get

{

return range[indexrange];

}

set

{

range[indexrange] = value;

}

}

}



/* The Above Class just act as array declaration using
this pointer */



class childclass

{

public static void Main()

{

ParentClass obj = new ParentClass();



/* The Above Class ParentClass create one
object name is obj */



obj[0] = "ONE";

obj[1] = "TWO";

obj[2] = "THREE";

obj[3] = "FOUR ";

obj[4] = "FIVE";

Console.WriteLine("WELCOME TO Jigs World\n");

Console.WriteLine("\n");



Console.WriteLine("{0}\n,{1}\n,{2}\n,{3}\n,{4}
\n", obj[0], obj[1], obj[2], obj[3], obj[4]);

Console.WriteLine("\n");

Console.WriteLine("Dont Fear Jigs is here\n");

Console.WriteLine("\n");

Console.ReadLine();

}

}

}

Answer / srinath thanuku

Sample code to use Indexers when there are more than one
variable in a Class.

class IndexerExample
{
private string[] SkillSet = new string[5];
private string userName;
private int salary;
public string this[int indexrange]
{
set
{
SkillSet[indexrange] = value;
}
get
{
return SkillSet[indexrange];
}
}
public int sal
{
get
{
return salary;
}
set
{
salary = value;
}
}
public string name
{
get
{
return userName;
}
set
{
userName = value;
}
}

}

Creating an Object of the Above Class:
IndexerExample obj = new IndexerExample();
obj[0] = "C#";
obj[1] = "VB.Net";
obj[2] = "ASP.Net";
obj[3] = "SQL Server 2005";
obj[4] = "JScript.Net";
obj.sal = 1000;
obj.name ="Madhavi K.";

Answer / dhara

indexer are the smart array in c# which retrive records
faster than simple array

Answer / srinivasu

1.Indexer is a concept of using an object like an array.
2.indexers are similar to properties
3.Indexer is a collection of SET and GET methods.
4.Indexer name must be "this".
5.One class can have only one indexer.

syntax:
------

properties:
-----------
string s;
public string Pname
{
set { s=value;}

get { return s;}
}


Indexers:(example)
---------

class test
{
string [] x=new string[3];
public string this [int i]
{
set {x[i]=value;}

get {return x[i];}

}

public void print()
{
for(int i=0;i<x.lenght;i++)
messageBox.show(x[i]);

}

}
//using

test t=new test();
t[0]="vasu";
t[1]="liki";
t[2]="kavi";
t.print();

Answer / rajkumar

hi..all you said in the above example is by considering
only 1 variable in a class i.e., string. if suppose i have
multiple variables/members in class how can use indexer
conscept.

i think u got my question. ur only assing 1 value through
object. what if i had other variables in class.??

please clarify my doubt. very urgent

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