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The Role of ICollection

The ICollection interface is the most primitive interface of the System.Collections namespace in

that it defines a behavior supported by a collection type. In a nutshell, this interface provides a

small set of members that allow you to determine (a) the number of items in the container, (b) the

thread safety of the container, as well as (c) the ability to copy the contents into a System.Array type.

Formally, ICollection is defined as follows (note that ICollection extends IEnumerable):

public interface ICollection : IEnumerable

{

int Count { get; }

bool IsSynchronized { get; }

object SyncRoot { get; }

void CopyTo(Array array, int index);

}

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