IEnumerable is the base interface for all non-generic collections like ArrayList that can be enumerated.
IEnumerator<T> is the base interface for all generic enumerators like List<>.
IEnumerable is an interface which implements the method
GetEnumerator method returns an
IEnumerator which provides options to iterate through the collection like foreach.
IEnumerable is the base interface for all non-generic collections that can be enumerated
IEnumerable with custom Enumerator
Implementing the IEnumerable interface allows classes to be enumerated in the same way as BCL collections. This requires extending the Enumerator class which tracks the state of the enumeration.
Other than iterating over a standard collection, examples include:
- Using ranges of numbers based on a function rather than a collection of objects
- Implementing different iteration algorithms over collections, like DFS or BFS on a graph collection
In its most basic form, an object that implements IEnumerable represents a series of objects. The objects in question can be iterated using the c#
In the example below, the object
sequenceOfNumbers implements IEnumerable. It represents a series of integers. The
foreach loop iterates through each in turn.