The System.Collections namespace contains classes for storing collections of objects, including lists, hastables, queues, and stacks.

Remarks

The System.Collections namespace contains useful classes for storing collections of objects.

All collections implement the ICollection interface, which provides basic functionality for iterating through the elements of a collection. Collections that support index-based access into their elements and the ability to add and remove elements, such as the ArrayList, implement the IList interface. Collections that provide a key/value mapping, such as the Hashtable, implement the IDictionary interface.

Classes

Type	Reason
ArrayList	Implements a variable-size IList that uses an array of objects to store its elements.
BitArray	The BItArray class implements a collection of Boolean values. There are several different constructors for initializing a new BitArray object.
CaseInsensitiveComparer	Documentation for this section has not yet been entered.
CaseInsensitiveHashCodeProvider	Documentation for this section has not yet been entered.
CollectionBase	Documentation for this section has not yet been entered.
Comparer	Provides the default implementation of the IComparer interface.
DictionaryBase	An abstract class that provides a simple way to monitor changes to a Hashtable. Derived classes overwrite one or more of the `On' methods to track the changes to the Hashtable.
Hashtable	Represents a hash table.
Queue	A first in, first out collection of objects.
ReadOnlyCollectionBase	Documentation for this section has not yet been entered.
SortedList	Documentation for this section has not yet been entered.
Stack	A last in, first out collection of objects.

Interfaces

Type	Reason
ICollection	Serves as the base interface for implementing collection classes. Defines size, enumeration, and synchronization methods for all system collections.
IComparer	Provides a mechanism to customize the sort ordering of a collection.
IDictionary	Implemented by classes that support collections of associated keys and values (i.e. dictionaries).
IDictionaryEnumerator	Implemented by classes that support the use of an enumerator over a dictionary (i.e., a collection of DictionaryEntry objects).
IEnumerable	Implemented by classes that support a simple iteration over instances of the collection.
IEnumerator	Implemented by classes that support a simple iteration over a collection.
IEqualityComparer	Documentation for this section has not yet been entered.
IHashCodeProvider	Implemented by classes that support custom hash functions for instances of the class.
IList	Implemented by classes that support a collection of objects that can be individually indexed.

Structs

Type	Reason
DictionaryEntry	Represents a dictionary entry consisting of a DictionaryEntry.Key and an associated DictionaryEntry.Value.