what is indexe? why we use it?

hey there!

Indexers allow your class to be used just like an array. On the inside of a class, you manage a collection of values any way you want. These objects could be a finite set of class members, another array, or some complex data structure. Regardless of the internal implementation of the class, its data can be obtained consistently through the use of indexers.

Read this link : http://www.dotnetperls.com/indexer

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.

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.

4 Replies

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Govinda Rajulu Yemineni11y ago
Hi,
Refer the following URL's

http://www.c-sharpcorner.com/uploadfile/puranindia/indexers-in-C-Sharp/

http://www.codeproject.com/Articles/11760/Understanding-Indexer-in-C
Rajeesh Menoth11y ago
Hi Neeraj Upadhyay,

Ref the following articles :

1) http://www.c-sharpcorner.com/uploadfile/puranindia/indexers-in-C-Sharp/

2) http://www.codeproject.com/Articles/11760/Understanding-Indexer-in-C
Nilesh Jadav11y ago
hey there!

Indexers allow your class to be used just like an array. On the inside of a class, you manage a collection of values any way you want. These objects could be a finite set of class members, another array, or some complex data structure. Regardless of the internal implementation of the class, its data can be obtained consistently through the use of indexers.

Read this link : http://www.dotnetperls.com/indexer
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.

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.
Sivaraman Dhamodaran11y ago
Indexer are useful to implement your own collection with the support of picking an individual item by means of index [] operator.

This article explains that: Link