ICollection Interface

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Defines size, enumerators, and synchronization methods for all nongeneric collections.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Interface ICollection _
	Inherits IEnumerable

The ICollection type exposes the following members.

  NameDescription
Public propertyCountGets the number of elements contained in the ICollection.
Public propertyIsSynchronizedGets a value indicating whether access to the ICollection is synchronized (thread safe).
Public propertySyncRootGets an object that can be used to synchronize access to the ICollection.
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  NameDescription
Public methodCopyToCopies the elements of the ICollection to an Array, starting at a particular Array index.
Public methodGetEnumeratorReturns an enumerator that iterates through a collection. (Inherited from IEnumerable.)
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The ICollection interface is the base interface for classes in the System.Collections namespace.

The ICollection interface extends IEnumerable; IDictionary and IList are more specialized interfaces that extend ICollection. An IDictionary implementation is a collection of key/value pairs, like the Hashtable class. An IList implementation is a collection of values and its members can be accessed by index, like the ArrayList class.

Some collections that limit access to their elements, such as the Queue class and the Stack class, directly implement the ICollection interface.

If neither the IDictionary interface nor the IList interface meet the requirements of the required collection, derive the new collection class from the ICollection interface instead for more flexibility.

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