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Indexers in C# .NET

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What are indexers in C# .NET? What is the difference between property & indexers? In which case we use indexers?

Answer 1)
C# introduces a new concept known as Indexers which are used for treating an object as an array. The indexers are usually known as smart arrays in C# community. Indexers permit instances of a class or struct to be indexed in the same way as arrays. Indexers are similar to properties except that their accessors (get/set) take parameters.

Indexers are most frequently implemented in types whose primary purpose is to encapsulate an internal collection or array. And also, as C# does not support parameterized properties, sometimes we implement indexers as alternatives.

To declare an indexer on a class or struct, use the this keyword, as in this example:

[Code=cs]
public int this[int index]    // Indexer declaration
{
    // get and set accessors
}
[/Code]
  Asked in:  SemanticSpace Technologies   Expertise Level:  Intermediate
  Last updated on Sunday, 07 August 2011
3/5 stars (11 vote(s))

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