What is Indexer in C#?

In C#, an indexer is a special member of a class that enables objects of that class to be accessed like arrays. It allows instances of a class to be indexed and accessed using the familiar square bracket notation.

By implementing an indexer, you can define the behavior of accessing an object using an index value. This provides a convenient way to retrieve or modify elements within a class as if it were an array or collection.

Here’s an example of how an indexer can be defined in a class:

public class MyCollection
{
    private string[] elements = new string[10];

    public string this[int index]
    {
        get
        {
            return elements[index];
        }
        set
        {
            elements[index] = value;
        }
    }
}

In this example, the MyCollection class defines an indexer using the this keyword followed by square brackets and an index parameter (int index). The get accessor retrieves the value at the specified index, and the set accessor assigns a value to the specified index.

The indexer can be used to access elements of an instance of the MyCollection class as if it were an array:

MyCollection collection = new MyCollection();
collection[0] = "Element 1";
string element = collection[0];
Console.WriteLine(element); // Output: "Element 1"

In this usage, the collection object is accessed using the indexer syntax, providing an index value within square brackets ([0]). This allows you to get or set the element at the specified index, just like you would with an array.

Indexers can also have multiple parameters, similar to methods, allowing for more complex indexing schemes or key-value pair access.

Indexers provide a convenient way to access elements or data within a class as if it were an array or collection. They enable custom logic and behavior to be applied when accessing or modifying elements, providing flexibility and abstraction in your code.

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