Indexer In C#

Indexer and its uses in C#.

Introduction

Indexers are instance members that allow class, struct and interfaces to be indexed just like an array, and the class behaves similar to a virtual array.

Indexer has no name but "get" and "set" accessor are  like properties.

Suppose we have a private string array with the name Days, that holds the names of the weekdays and I want to access the names of the days using index. To achieve this, we use Indexer as shown below.

public class Indexers {
    public string[] Days = {
        "Sunday",
        "Monday",
        "Tuesday",
        "Wednesday",
        "Thursday",
        "Friday",
        "Saturday"
    };
    public string this[int index] {
        get {
            return Days[index];
        }
    }
}
public class IndexerClient {
    public static void Main(string[] args) {
        Indexers IOb = new Indexers();
        Console.WriteLine(IOb[0]); // sunday
        Console.ReadKey();
    }
}