How to create an OrderedDictionary in C#

Last Updated : 27 Feb, 2019

OrderedDictionary() constructor is used to initialize a new instance of the OrderedDictionary class which will be empty and will have the default initial capacity. OrderedDictionary Class represents a collection of key/value pairs that are accessible by the key or index. It is present in System.Collections.Specialized namespace.

Syntax:

public OrderedDictionary();

Example 1:

   // C# Program to illustrate how 
// to create a OrderedDictionary 
using System; 
using System.Collections; 
using System.Collections.Specialized; 
  
class Geeks { 
  
    // Main Method 
    public static void Main(String[] args) 
    { 
  
        // od is the OrderedDictionary object 
        // OrderedDictionary() is the constructor 
        // used to initializes a new 
        // instance of the OrderedDictionary class 
        OrderedDictionary od = new OrderedDictionary(); 
  
        // Count property is used to get the 
        // number of elements in OrderedDictionary 
        // It will give 0 as no elements 
        // are present currently 
        Console.WriteLine("The number of elements: "
                                           +od.Count); 
    } 
} 
 
  

Output:

  The number of elements: 0

Example 2:

   // C# Program to illustrate how 
// to create a OrderedDictionary 
using System; 
using System.Collections; 
using System.Collections.Specialized; 
  
class Geeks { 
  
    // Main Method 
    public static void Main(String[] args) 
    { 
  
        // od is the OrderedDictionary object 
        // OrderedDictionary() is the constructor 
        // used to initializes a new 
        // instance of the OrderedDictionary class 
        OrderedDictionary od = new OrderedDictionary(); 
  
        Console.Write("Before Add Method: "); 
  
        // Count property is used to get the 
        // number of elements in OrderedDictionary 
        // It will give 0 as no elements 
        // are present currently 
        Console.WriteLine(od.Count); 
  
        // Adding key/value pairs in od 
        od.Add("1", "C"); 
        od.Add("2", "C++"); 
        od.Add("3", "Java"); 
        od.Add("4", "C#"); 
  
        Console.Write("After Add Method: "); 
  
        // Count property is used to get the 
        // number of elements in ld 
        Console.WriteLine(od.Count); 
    } 
} 
 
  

Output:

  Before Add Method: 0  After Add Method: 4

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.ordereddictionary.-ctor?view=netframework-4.7.2#System_Collections_Specialized_OrderedDictionary__ctor

How to create a StringDictionary in C#

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