C# | Check if a HashSet is a superset of the specified collection

A HashSet is an unordered collection of the unique elements. It comes under System.Collections.Generic namespace. It is used in a situation where we want to prevent duplicates from being inserted in the collection. As far as performance is concerned, it is better in comparison to the list. HashSet<T>.IsSupersetOf(IEnumerable) method is used to check whether a HashSet object is a superset of the specified collection or not.

Syntax:

mySet1.IsSupersetOf(mySet2);

Here, mySet1 and mySet2 are the two HashSets.



Return Value: This method returns True if the HashSet object is a superset of another subset otherwise it retunrs False.

Exception: This method will give ArgumentNullException if the HashSet is null.

Below given are some examples to understand the implementation in a better way:

Example 1:

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// C# code to Check if a HashSet is a
// superset of the specified collection
using System;
using System.Collections.Generic;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a HashSet of strings
        HashSet<string> mySet1 = new HashSet<string>();
  
        // Inserting elements in HashSet
        mySet1.Add("Geeks");
        mySet1.Add("GeeksQuiz");
  
        // Creating a HashSet of strings
        HashSet<string> mySet2 = new HashSet<string>();
  
        // Inserting elements in HashSet
        mySet2.Add("DS");
        mySet2.Add("C++");
        mySet2.Add("Java");
        mySet2.Add("JavaScript");
        mySet2.Add("GeeksQuiz");
        mySet2.Add("Geeks");
  
        // Check if a HashSet is a superset
        // of the specified collection
        // It should return true as HashSet mySet2
        // is superset of HashSet mySet1
        Console.WriteLine(mySet2.IsSupersetOf(mySet1));
    }
}

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Output:


True





Example 2:











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// C# code to Check if a HashSet is a 


// superset of the specified collection 


using System; 


using System.Collections.Generic; 


  


class GFG { 


  


    // Driver code 


    public static void Main() 


    { 


  


        // Creating a HashSet of integers 


        HashSet<int> mySet1 = new HashSet<int>(); 


  


        // Inserting elements in HashSet 


        mySet1.Add(2); 


        mySet1.Add(3); 


        mySet1.Add(4); 


        mySet1.Add(5); 


  


        // Creating a HashSet of integers 


        HashSet<int> mySet2 = new HashSet<int>(); 


  


        // Inserting elements in HashSet 


        mySet2.Add(3); 


        mySet2.Add(4); 


        mySet2.Add(5); 


        mySet2.Add(6); 


  


        // Check if a HashSet is a superset 


        // of the specified collection 


        // It should return false as HashSet mySet2 


        // is not a superset of HashSet mySet1 


        Console.WriteLine(mySet2.IsSupersetOf(mySet1)); 


    } 


} 



















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Output:


False





Reference:




          
          
          

          

    

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