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<The C# yield-foreach howto ⁄ >




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One of the cool features of the C# language, is the ability to quickly create an enumerable projection of what a class is an abstraction for. Providing an enumerator for users of the class is often a very desirable solution

* The client is agnostic to the class' internal representation.
* The client is loosely coupled to the class. It is only dependent on a very general interface when traversing the data.
* The class may provide a read-only enumeration to the client for a more thread-safe or functional implementation approach.
* Direct access using an index is not suitable to all data structures, in particular to data structures such as trees with no or slow random access.
* An enumerator may enforce restrictions on access, such as ensuring that elements can not be skipped or that a previously visited element can not be accessed again.



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