C# | Check if a HashSet is a superset of the specified collection
Last Updated :
12 Jun, 2023
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:
C#
using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
HashSet< string > set = new HashSet< string > { "apple" , "banana" , "cherry" , "date" };
List< string > list = new List< string > { "apple" , "banana" };
bool isSuperset = set .IsSupersetOf(list);
if (isSuperset)
{
Console.WriteLine( "The HashSet is a superset of the List." );
}
else
{
Console.WriteLine( "The HashSet is not a superset of the List." );
}
}
}
|
Output
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:
CSHARP
using System;
using System.Collections.Generic;
class GFG {
public static void Main()
{
HashSet< string > mySet1 = new HashSet< string >();
mySet1.Add("Geeks");
mySet1.Add("GeeksQuiz");
HashSet< string > mySet2 = new HashSet< string >();
mySet2.Add("DS");
mySet2.Add("C++");
mySet2.Add("Java");
mySet2.Add("JavaScript");
mySet2.Add("GeeksQuiz");
mySet2.Add("Geeks");
Console.WriteLine(mySet2.IsSupersetOf(mySet1));
}
}
|
Example 2:
CSHARP
using System;
using System.Collections.Generic;
class GFG {
public static void Main()
{
HashSet< int > mySet1 = new HashSet< int >();
mySet1.Add(2);
mySet1.Add(3);
mySet1.Add(4);
mySet1.Add(5);
HashSet< int > mySet2 = new HashSet< int >();
mySet2.Add(3);
mySet2.Add(4);
mySet2.Add(5);
mySet2.Add(6);
Console.WriteLine(mySet2.IsSupersetOf(mySet1));
}
}
|
Reference:
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