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C# Collections

In C#, collection represents group of objects. By the help of collections, we can perform various operations on objects such as

  • store object
  • update object
  • delete object
  • retrieve object
  • search object, and
  • sort object

In sort, all the data structure work can be performed by C# collections.

We can store objects in array or collection. Collection has advantage over array. Array has size limit but objects stored in collection can grow or shrink dynamically.

Types of Collections in C#

There are 3 ways to work with collections. The three namespaces are given below:

  • System.Collections.Generic classes
  • System.Collections classes (Now deprecated)
  • System.Collections.Concurrent classes

1) System.Collections.Generic classes

The System.Collections.Generic namespace has following classes:

  • List
  • Stack
  • Queue
  • LinkedList
  • HashSet
  • SortedSet
  • Dictionary
  • SortedDictionary
  • SortedList

2) System.Collections classes

These classes are legacy. It is suggested now to use System.Collections.Generic classes. The System.Collections namespace has following classes:

  • ArrayList
  • Stack
  • Queue
  • Hashtable

3) System.Collections.Concurrent classes

The System.Collections.Concurrent namespace provides classes for thread-safe operations. Now multiple threads will not create problem for accessing the collection items.

The System.Collections.Concurrent namespace has following classes:

  • BlockingCollection
  • ConcurrentBag
  • ConcurrentStack
  • ConcurrentQueue
  • ConcurrentDictionary
  • Partitioner
  • Partitioner
  • OrderablePartitioner
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