C# - what are Indexers?What is the use of it,and when to use Indexers?

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what are Indexers?What is the use of it,and when to use Indexers?

Total Answers and Comments: 2

Last Update: May 29, 2008 Asked by: harvenki

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January 28, 2007 17:43:57

mepoo

Member Since: January 2007 Contribution: 5

RE: what are Indexers?What is the use of it,and when t...

An indexer is a member that enables an object to be indexed in the same way as an array.There are times when it is desirable to access a collection within a class as though the class itself were an array. For example suppose you create a list box control named myListBox that contains alist of strings stored in a one-dimensional array a private member variable named myStrings. Alist box control contains member properties and methods in addition to its array of strings.However it would be convenient to be able to access the list box array with an index just as if thelist box were an array.This can be achieved using the Indexer

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May 29, 2008 01:45:56

nikhilrawat23

Member Since: May 2008 Contribution: 15

RE: what are Indexers?What is the use of it,and when to use Indexers?

Indexers are one neat feature of C#. They allow us to access a particular class as it is an array. They are similar to the properties in means that they encapsulate method calls into more convenient representation of value access and value setting. Declaring a property you can access it with its name so it behaves like variable. The indexer is actually a class so it behaves as a type i.e. you have to declare a variable of its type (actually to instantiate an object from it but all variables are objects anyway). Indexers are also called smart arrays in C# and can be used to treat an object as an array. An indexer allows an instance of a class or a struct to be indexed as an array which is useful for looping or iterating or data binding operations. The following is the syntax of an indexer declaration.
<Modifier> <Return type> this [arguments]

{
get

Set

All indexers should accept at least one parameter. Indexers cannot be static. This is because static methods do not have access to ‘this’. The ‘this’ keyword indicates an instance of the current class.

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