Indexers in C#

Introduction:

Indexers are location indicators and are used to access class objects,just like accessing elements in an array.they are useful in cases where a class is a container for other objects.here example uses indexers and makes an array of 15 values,stores a few values in the arrayand the null values of array from 12 position are stored with the words "empty".

Example:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace IndexersExample

{

class indexersEx

{

private string[] TechCompanies = new string[14];

public string this[int indexval]

{

get

{

if (indexval < 0 || indexval >= 11)

return "empty";

else

return TechCompanies[indexval];

}

set

{

if (!(indexval < 0 || indexval >= 11))

TechCompanies[indexval] = value;

}

class theMainClass

{

public static void Main()

{

indexersEx Obj = new indexersEx();

Obj[0] ="MCN";

Obj[3] ="ACCENTURE";

Obj[5] ="GENPACT";

Obj[6] ="POLARIS SOFTWARE";

Obj[8] = "PATNI COMPUTERS";

Obj[10] ="MICROSOFT";

Obj[12] ="HCL";

Obj[14] ="FIJUTSU";

Console.WriteLine("This is the list of IT Companies in India.\n");

for (int i=0;i<=14;i++)

{

Console.WriteLine("The name of IT Company at Index {0}{1}",i,Obj[i]);

}

Output of the program: