Hashtable in C#

 

Hi frnds, you couldn't believe about hashtable concept in c#.

 

I don't know ,how would I missed it. But its very helpful while searching for generic collections related techniques. I just viewed it , but never used it before.

 

So I am sharing some ways to use it at your place.

 

 

Members of hastable :  

 

Key :-  Unique value which can be number or character

 

Value :- Value you want to store on particular key

 

 

The example adds 15 distinct integer keys, with one string value each, to the Hashtable object.

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace HashTableDemos
{
    class Program
    {
        static void Main(string[] args)
        {
            string _concat = "A";
            Hashtable _hash = new Hashtable(15);
            for (int _key = 0; _key < 15; _key++)
            {
                _concat = _concat + _key;
                _hash.Add(_key, _concat.ToString());
                Console.WriteLine("Key {0} ,Value {1} ", _key, _concat.ToString());

            }
            Console.ReadLine();

        }
    }
} 

 

Output : Please check at u r side.....

 

 

Contains  method in Hastable:

 

Instance methods on the Hashtable ,which returns true if the key is found, regardless of the value.

 

Example: 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace HashTableDemos
{
    class Program
    {
        static void Main(string[] args)
        {
            Hashtable hashtable = GetHashtable();
            // See if the Hashtable contains this key.
            Console.WriteLine(hashtable.ContainsKey("Perimeter"));
            // Test the Contains method. It works the same way.
            Console.WriteLine(hashtable.Contains("Area"));
            // Get value of Area with indexer.
            int value = (int)hashtable["Area"];
            // Write the value of Area.
            Console.WriteLine(value);
            Console.ReadLine();
        }

        static Hashtable GetHashtable()
        {           
            Hashtable hashtable = new Hashtable();
            hashtable.Add("Area", 1000);
            hashtable.Add("Perimeter", 55);
            hashtable.Add("Mortgage", 540);
            return hashtable;
        }
    }
}

 [Note :  But if we compare Hastable with Dictionary ... we found hashtable results slower than Dictionary. ]