HashTable example in c#.

HashTable:-

A hash table is used when you need to access an element using key. Each item in a hash table has a key/value pair. The key is used to access the item in collection.

Properties Of  HashTable  Class:-

Count :- Gets the number of elements actually contained thr hashtable.

IsFixedSize :- Gets a value indicating whether the hashtable has fixed size.

IsReadOnly :-  Gets a value indicating whether the hashtable has ReadOnly.

Item :- Gets or sets the elements at specified index.

Key :- Gets an ICollection containing the keys in the hashtable.

Value :- Gets an ICollection containing the values in the hashtable.

Methods Of HashTable Class :-

There are various methods in hashtable class for ex. Add(), Clear(),Remove() etc. I have explained all methods in below example of hashtable.

Example:-

using System;

using System.Collections;

using System.Linq;

using System.Text;

using System.Data;

namespace CollectionExample

{

    class Program

    {

//HashList Example-------------------------------------------------------------------------

            Console.WriteLine("-------------Hash table Example---------------");

            Hashtable ht = new Hashtable();

            ht.Add("1", "Sushil");

            ht.Add("2", "Kumar");

            ht.Add("3", "Sanjay");

            ht.Add("4", "Muthu");

            ht.Add("5", "Ashu");

            ht.Remove("1");

            if (ht.ContainsValue("Mantra"))

            {

                Console.WriteLine("This name already exist in HashTable.");

            }

            else

            {

                ht.Add("6", "Mantra");

            }

            ICollection key = ht.Keys;// to get collection of key

            foreach (string s in key)

            {

                Console.WriteLine(s + " " + ht[s]);

            }

            Console.ReadKey();

      }

   }

}

Output:-

-------------Hash table Example---------------

3 Sanjay

6 Mantra

4 Muthu

5 Ashu

2 Kumar