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System.Object

Indexer in C#.Net

An indexer allows an object to be indexed like an array. When you define an indexer for a class, this class behaves like a virtual array. You can then access the instance of this class using the array access operator ([ ]).

Use of Indexers
Declaration of behavior of an indexer is to some extent similar to a property. Like properties, you have get and set accessors for defining an indexer. However, properties return or set a specific data member, whereas indexers returns or sets a particular value from the object instance. In other words, it breaks the instance data into smaller parts and indexes each part, gets or sets each part.
Defining a property involves providing a property name. Indexers are not defined with names, but with this keyword, which refers to the object instance. The following example demonstrates the concept:

class ex_indexer
{
	private string[] name = new string[10];
	public string this[int index]
	{
		get
		{
			string s = name[index];
			return s;
		}
		set
		{
			name[index] = value;
		}
	}
}
class Program
{
	static void Main(string[] args)
	{
		ex_indexer obj = new ex_indexer();
		obj[0] = "ankit";
		obj[1] = "ankeet";
		for(int i = 0;i<=9;i++)
		{
			Console.WriteLine(obj[i]);
		}
		Console.ReadKey();
	}
}
Updated: 07-Feb-19