Indexer

What is Indexer?

 

Indexer is a structure that makes it possible to deal with class as array by accessing array. Indexer is a structure that makes it possible to deal with class as array by accessing array in object. Indexer is consisted of "get" accessor and "set" accessor just like property.

 

definition of Indexer

 

Indexer is defined as,

 

read only indexer when set accessor is not specified.

 

write only indexer when get accessor is not specified.

 

public int this[int i]
        {
            get
            {
                return a[i]
            }

            set
            {
                a[i] = value;
            }
        }

 

How to use Indexer

 

how to use Indexer is same as that of property. On the example below, kz is dealt as as  array.

 

class Kazu1
    {
        int[] suji = new int[4];
        public int this[int i];
        get
        {
            return suji[i];
        }
        set
        {
            suji[i] = value;
        }
    }

    class kazu2
        {
            static void Main()
            {
                Kazu1 kz = new Kazu1();
                kz[0] = 1;
                kz[1] = 2;
                kz[2] = 3;
                kz[3] = 4;

                for (int i = 1; i <= 3; i++)
                {
                    Console.WriteLine(kz[i]);
                }
            }
        }