INDEXER in C#

INDEXER IN C#

 

 

C# introduces a new concept Indexer. This is very useful for some situation. Let as discuss something about Indexer.

• 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 C# CORNER HOME PAGE\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("ALS.Senthur Ganesh Ram Kumar\n");
            Console.WriteLine("\n");
            Console.ReadLine();
        }
    }
}