The functionalities of ICollection, IList and IEnuerable are listed in the following table.
| Interfaces | Functionalities |
|---|---|
| IEnumerable<T> (and IEnumerable) | Enumerable |
| ICollection<T> (and ICollection) | Countable |
| IList <T>/IDictionary <K,V> and their nongeneric versions | Accessible by index/key |
interface ICollection<T> is defined as follows:
public interface ICollection<T> : IEnumerable<T>, IEnumerable
{
int Count { get; }
bool Contains (T item);
void CopyTo (T[] array, int arrayIndex);
bool IsReadOnly { get; }
void Add(T item);
bool Remove (T item);
void Clear();
}
The nongeneric ICollection is similar in providing a countable collection:
public interface ICollection : IEnumerable
{
int Count { get; }
bool IsSynchronized { get; }
object SyncRoot { get; }
void CopyTo (Array array, int index);
}
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