Difference between create Enumerable or Enumerator using Iterators in C#

Question

What is the difference between creating Enumerable or Enumerator using Iterators in C#? I know that Iterators are used to create a private class that implements Enumerable or Enumerator...

Which way is better to create an enumerable type?

Answer 1

Every type that implements the IEnumerable interface should implement a method GetEnumerator which returns a type that implements the IEnumerator interface. Then having an enumerator you can use the foreach statement, which in its essence implements the iterator pattern, to traverse the elements of a collection of your custom type.

For further clarification please take a look to the following links:

1. IEnumerable
2. IEnumerator
3. Iterator Pattern

So in order to answer to your question, I have to say that we shouldn't try to compare the IEnumerable and IEnumerator. They both are used together, when we want to use the iterator pattern for a custom type.