In object-oriented programming, an indexer allows instances of a particular class or struct to be indexed just like arrays.
Contents
Implementation
Indexers are implemented through the get and set accessors for the operator[]. They are similar to properties, but differ by not being static, and the fact that indexers' accessors take parameters. The get and set accessors are called as methods using the parameter list of the indexer declaration, but the set accessor still has the implicit value parameter.
Example
Here is a C# example of the usage of an indexer in a class:
References
Indexer (programming) Wikipedia(Text) CC BY-SA