Indexers in C#

Using Indexers in C#

Indexer is one of the advanced concepts in C# and much powerful as well..
Indexers are realy easy. They allow your class to be used just like an array. On the inside of a class, you manage a collection of values any way you want. These objects could be a finite set of class members, another array, or some complex data structure. Regardless of the internal implementation of the class, its data can be obtained consistently through the use of indexers.

Following is a generic sample program

public class MySampleCollection<T>
    {
        // Declare an array to store the data elements.
        private const int MAX_SIZE = 100;
        private T[] arr = new T[MAX_SIZE];

        public T this[int index]
        {
            get {
                if (index >= 0 && index < MAX_SIZE)
                {
                   
                    return arr[index];
                }
                else
                {
                    throw new IndexOutOfRangeException();
                }
            }

            set
            {
                if (index >= 0 && index < MAX_SIZE)
                {
                    arr[index] = value;
                }
                else
                {
                    throw new IndexOutOfRangeException();
                }
            }
            
         
        }
       
    }
    class Program
    {
        static void Main(string[] args)
        {
            // Declare an instance of the SampleCollection type.
            MySampleCollection<string> stringCollection = new MySampleCollection<string>();

            // Use [] notation on the type.
            stringCollection[0] = "Hello, World";
            System.Console.WriteLine(stringCollection[0]);
            
        }
    }