Basics of .NET Collections in C#

In project some time we need create and manage group of related objects, For that C# have some special things is know as collection.In collection we have Generic also its intro in C#2.0 This Article may useful for know the Collection in C#.

A collection is a set of similarly typed objects that are grouped together.

1. ArrayList : Array of objects whose size is dynamically increased as required.


ArrayList   obj = new ArrayList();

List.Add(1);
List.Add(2);
ForEach(object  O in obj)
{
 Console.WriteLine(O.tostring());
}

2. HashTable : Its have unique value store in the key and value.


Hashtable  hash = new hashtable();

Hash.Add( 1,"rathi")

3. List : Its dynamically Allocation of Array


List lt = new List();

In List We can use Tuple also for multiple parameters.

4. Dictionary : used with type parameters to store keys and values of specific types


Dictionary dict = new Dictionary();

Difference between Dictionary and Hashtable

Dictionary:
•It returns error if we try to find a key which does not exist.
•It is faster than a Hash Table because there is no boxing and unboxing.
•Only public static members are thread safe.
•Dictionary is a generic type which means we can use it with any data type.

Hashtable:
•It returns null if we try to find a key which does not exist.
•It is slower than dictionary because it requires boxing and unboxing.
•All the members in a Hashtable are thread safe,
•Hashtable is not a generic type,

Array: collection of datatype


Int [] num = new int[5]

5. Queue
A First in,First out of object


  static void Main()
    {
      Queue collectionQueue = new Queue();
	collectionQueue.Enqueue(5);
	collectionQueue.Enqueue(6);
	foreach (int value in collectionQueue)
	{
	    Console.WriteLine(value);
	}
    }

6. Stack
A last in,First out in object


Static  Stack GetStackList()
    {
	Stack stack = new Stack();
	stack.Push(1);
	stack.Push(2);
	stack.Push(3);
	return stack;
    }
   static void Main()
    {
	Var  Varstack = GetStackList ();
	foreach (int i in Varstack)
	{
	    Console.WriteLine(i +"Stack values");
	}
    }

Basics of .NET Collections in C#

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