collection

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Collection in C# with Examples

Mukesh Kumar · Answer

Hi, The following are the various commonly used classes of theSystem.Collection namespace. Click the following links to check their detail. ArrayList It represents ordered collection of an object that can beindexed individually. It is basically an alternative to an array. However, unlike array you can add and remove items from a list at a specified position using an index and the array resizes itself automatically. It also allows dynamic memory allocation, adding, searching and sorting items in the list. Hashtable It uses a key to access the elements in the collection. A hash table is used when you need to access elements by using key, and you can identify a useful key value. Each item in the hash table has a key/value pair. The key is used to access the items in the collection. SortedList It uses a key as well as an index to access the items in a list. A sorted list is a combination of an array and a hash table. It contains a list of items that can be accessed using a key or an index. If you access items using an index, it is an ArrayList, and if you access items using a key , it is a Hashtable. The collection of items is always sorted by the key value. Stack It represents a last-in, first out collection of object. It is used when you need a last-in, first-out access of items. When you add an item in the list, it is called pushing the item and when you remove it, it is called popping the item. Queue It represents a first-in, first out collection of object. It is used when you need a first-in, first-out access of items. When you add an item in the list, it is calledenqueue and when you remove an item, it is calleddeque. BitArray It represents an array of the binary representation using the values 1 and 0. It is used when you need to store the bits but do not know the number of bits in advance. You can access items from the BitArray collection by using an integer index, which starts from zero. For example read these articles.. http://csharp.net-informations.com/collection/csharp-collection-tutorial.htm https://msdn.microsoft.com/en-us/library/ybcx56wz.aspx Hope this will help you. thanks

Nishant Mittal · Answer

All the collections implement IEnumerable interface. To collect many objects in one single objects we use collections. ArrayList Dictionary hastTable all are collections. Dictionary and Hash table use key value pair. Array use accept object that u need to typecast later on. Hashtable also contains Object as key and object as value ..later on u need to typecase the same as well. I can say list is also a collection which is strong type.

Ravi Patel · Answer

Hi Chandu, go through msdn link https://msdn.microsoft.com/en-us/library/ybcx56wz.aspx

Raja T · Answer

Hello Chandu, Collections are data structures that holds data in different ways for flexible operations . C# Collection classes are defined as part of the System.Collections or System.Collections.Generic namespace. More details checkout below links http://csharp.net-informations.com/collection/csharp-collection-tutorial.htm http://www.c-sharpcorner.com/UploadFile/84c85b/using-net-collections-with-C-Sharp/ http://www.c-sharpcorner.com/Blogs/7170/collections-in-C-Sharp.aspx http://www.c-sharpcorner.com/UploadFile/736bf5/collection-in-C-Sharp/

collection

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