Which collection does not implement IEnumerable

Question

Is there any type of collection under System.Collections that does not inherit from IEnumerable or IEnumerable<T> ?

I need an example.

Answer 1

No class directly inside System.Collections will implement IEnumerable<T> - that namespace predates generics in .NET - however the classes which could roughly be defined "Collections" in that namespace all implement IEnumerable

• ArrayList
• BitArray
• CollectionBase
• DictionaryBase
• Hashtable
• Queue
• ReadOnlyCollectionBase
• SortedList
• Stack

If we expand to "Any namespace below System.Collections " we get into System.Collections.Generic and System.Collections.ObjectModel and System.Collections.Specialized - all the collections classes inside them implement IEnumerable , IEnumerable<T> or both.