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What does possible multiple enumeration mean?
and it’ll take you to this page: https://confluence.jetbrains.com/display/ReSharper/Possible+multiple+enumeration+of+IEnumerable. Essentially, it means you’re trying to evaluate the contents of the IEnumerable more than once.
What is the difference between IEnumerable and list?
2 Answers. One important difference between IEnumerable and List (besides one being an interface and the other being a concrete class) is that IEnumerable is read-only and List is not. So if you need the ability to make permanent changes of any kind to your collection (add & remove), you’ll need List.
What is the difference between ICollection and IEnumerable?
An IEnumerable does not hold even the count of the items in the list, instead, you have to iterate over the elements to get the count of items. ICollection is another type of collection, which derives from IEnumerable and extends it’s functionality to add, remove, update element in the list.
What is the difference between an IEnumerable and a list?
Where is IEnumerable used?
IEnumerable interface is used when we want to iterate among our classes using a foreach loop. The IEnumerable interface has one method, GetEnumerator, that returns an IEnumerator interface that helps us to iterate among the class using the foreach loop.
Should I return IEnumerable or IList?
Generally, it’s better to return IEnumerable , as long as that has everything the caller needs. IEnumerable is foreachable, which is all that’s needed for many consumers. However, if the consumer needs methods that aren’t on IEnumerable , then IList might make more sense.
Is IEnumerable faster than List?
We aren’t forcing the caller to convert their data structure to a List unnecessarily. So it isn’t that IEnumerable is more efficient than list in a “performance” or “runtime” aspect. It’s that IEnumerable is a more efficient design construct because it’s a more specific indication of what your design requires.
Why do we use IEnumerable?