Indexers in C# are a way to allow objects to be indexed just like arrays. They provide a syntax that enables classes to be accessed using the square bracket notation, similar to how arrays are accessed. Indexers allow you to define custom indexing behavior for your classes.
Here are the key points about indexers in C#:
Definition and Syntax
Indexers are defined using the this keyword followed by square brackets [] to specify the index parameter(s).
The index parameter(s) can be of any type, and multiple parameters are separated by commas.
The return type of the indexer is specified after the parameter list.
public class MyClass
{
// Indexer with a single integer parameter
public string this[int index]
{
get { /* Return the value at the specified index */ }
set { /* Set the value at the specified index */ }
}
}
Usage
Indexers are used to access the class instance as if it were an array, using the square bracket notation.
The index value(s) specified in the square brackets are passed to the indexer's get and set accessors.
MyClass obj = new MyClass();
string value = obj[index]; // Using the indexer...
