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ICollection Interface

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

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)
[ComVisibleAttribute(true)]
public interface ICollection : IEnumerable

The ICollection type exposes the following members.

  NameDescription
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryCountGets the number of elements contained in the ICollection.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryIsSynchronizedGets a value indicating whether access to the ICollection is synchronized (thread safe).
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySyncRootGets an object that can be used to synchronize access to the ICollection.
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  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryCopyToCopies the elements of the ICollection to an Array, starting at a particular Array index.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetEnumeratorReturns an enumerator that iterates through a collection. (Inherited from IEnumerable.)
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  NameDescription
Public Extension MethodAsParallelEnables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodSupported by Portable Class LibraryAsQueryableConverts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension MethodSupported by the XNA FrameworkSupported by Portable Class LibraryCast<TResult>Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension MethodSupported by the XNA FrameworkSupported by Portable Class LibraryOfType<TResult>Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
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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.

For the generic version of this interface, see System.Collections.Generic.ICollection<T>.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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