Dictionary in C#

A dictionary in C#, is a generic data type that stores a set of values with their corresponding keys internally for faster data retrieval.

The operation of finding the value associated with a key is called lookup or indexing.

Dictionay provide type safety and type casting(Generic concept)

Dictionary( Dictionary<TKey, TValue>) is a generic type, Hashtable is not

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Dictionary

{

class Program

{

static void Main(string[] args)

{

try

{

Dictionary<string, Int16> list = new Dictionary<string, Int16>();

list.Add("Manu", 1);

list.Add("Akhtar", 2);

list.Add("Pitambar", 3);

list.Add("Ratan", 4);

// list.Add("Manu", 1);// An item with the same key has already been added. argument exception was unhandeld

//"is check the pair of values and keys"

list["Manu"] = 11; // insert new value and keys into dictionary.

//If keys our values exists it will update this, Its called Item property

Console.WriteLine("Data are given below:================");

foreach (KeyValuePair<string, Int16> member in list)

{

Console.WriteLine("key = {0}, value = {1}", member.Key, member.Value);

}

Console.WriteLine("Count ={0}", list.Count());

Dictionary<string, Int16>.KeyCollection keys = list.Keys;

Console.WriteLine("keys are given below:================");

foreach (string key in keys)

{

Console.WriteLine("Key: {0}", key);

}

Dictionary<string, Int16>.ValueCollection values = list.Values; // return object of value collection type