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What is a dictionary in C#?
Dictionary is a collection of keys and values in C#. Dictionary is included in the System.Collection.Generics namespace.
To declare and initialize a Dictionary −
IDictionary<int, int> d = new Dictionary<int, int>();
Above, types of key and value are set while declaring a dictionary object. An int is a type of key and string is a type of value. Both will get stored in a dictionary object named d.
Let us now see an example −
Example
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
IDictionary<int, int> d = new Dictionary<int, int>();
d.Add(1,97);
d.Add(2,89);
d.Add(3,77);
d.Add(4,88);
// Dictionary elements
Console.WriteLine("Dictionaly elements: "+d.Count);
}
}
Updated on: 20-Jun-2020
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