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

Sure, here's an example code that demonstrates using the IsSupersetOf method to check if a HashSet<string> is a superset of a List<string> and then printing out a message indicating the result:

The HashSet is a superset of the List.

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 returns 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: 

Example 2: 

Reference:

• https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.issupersetof?view=netframework-4.7.2