C# Generic Collections Part 2: Dictionary

Dictionary:

Dictionary in C# is same as English dictionary. English dictionary is a collection of words and their definitions, often listed alphabetically in one or more specific languages. In the same way, the Dictionary in C# is a collection of Keys and Values, where key is like word and value is like definition.

Dictionary<TKey, TValue> is a generic collection included in the System.Collection.Generics namespace. TKey denotes the type of key and TValue is the type of TValue.

Code:

1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4.   
5. namespace dictionaryDemo  
6. {  
7.     class Program  
8.     {  
9.         static void Main(string[] args)  
10.         {  
11.             Dictionary<string, object> dt = new Dictionary<string, object>();  
12.             dt.Add("Roll",1001);  
13.             dt.Add("Name","Sujan Hasan");  
14.             dt.Add("Dept","CSE");  
15.             dt.Add("Email","sujanhasan@gmail.com");  
16.             dt.Add("Age",21);  
17.             print(dt);  
18.          
19.             Console.ReadKey();  
20.         }  
21.   
22.         public static void print(Dictionary<string, object> dictionary)  
23.         {  
24.             foreach (string x in dictionary.Keys)  
25.             {  
26.                 Console.WriteLine(x+" : "+dictionary[x]);  
27.             }  
28.         }  
29.     }  
30. }