When implementing iterator using yield return, is there any difference between returning IEnumerator and IEnumerable?
When implementing iterator using yield return , is there any difference between returning IEnumerator
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When implementing iterator using yield return, is there any difference between returning IEnumerator and IEnumerable?
IEnumerableandIEnumeratorare two different things.IEnumerable<T>is a sequence that can be iterated over.IEnumerator<T>is an object that is returned byIEnumerable<T>to iterate once over the sequence.In general, the only place to return
IEnumerator<T>is in theGetEnumerator()method.yield returnbehaves the same way for both types, except that an iterator method that returnsIEnumerable<T>can execute multiple times (each time the sequence is enumerated).For more information on how this works, see Jon Skeet’s article.