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>.IsProperSubsetOf(IEnumerable<T>) method is used to check whether a HashSet<T> object is a proper subset of the specified collection.
Syntax:
mySet1.IsProperSubsetOf(mySet2);
Here, mySet1 and mySet2 are two HashSets.
Return Value: This method returns True if mySet1 is proper subset of mySet2 otherwise it returns false.
Exception: This method will give ArgumentNullException if the HashSets is null.
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# code to Check if a HashSet is a proper // subset 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 proper
// subset of the specified collection
Console.WriteLine(mySet1.IsProperSubsetOf(mySet2));
}
} |
True
Example 2:
// C# code to Check if a HashSet is a proper // subset 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(4);
mySet1.Add(8);
mySet1.Add(12);
mySet1.Add(16);
// Creating a HashSet of integers
HashSet< int > mySet2 = new HashSet< int >();
// Inserting elements in HashSet
mySet2.Add(4);
mySet2.Add(8);
mySet2.Add(15);
mySet2.Add(20);
// Check if a HashSet is a proper
// subset of the specified collection
Console.WriteLine(mySet1.IsProperSubsetOf(mySet2));
}
} |
False
Reference: