Indexers

C# Indexers

• An Indexer is a special type of property that allows a class or structure to be accessed like an array for its private collection.
• An indexer can be defined the same way as property with this keyword and square brackets [].
• 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.

Example

 class IndexerExample

    {

        public string[] stringarr = new string[10];

        public string this[int index]

        {

            get

            {

                return stringarr[index];

            }

            set

            {

                stringarr[index] = value;

            }

        }

        public static void Main()

        {

            IndexerExample ie = new IndexerExample();

            ie[0] = "This";

            ie[1] = "Is";

            ie[2] = "Indexer";

            ie[3] = "Example";

           Console.WriteLine(ie[0] + " " + ie[1] +" "+ ie[2] + " " + ie[3]);

           Console.ReadLine();

        }

Output:

This is Indexer Example