C# | Check if a HashSet is a subset of the specified collection
A HashSet is an unordered collection of the unique elements. It is found in 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.IsSubsetOf(IEnumerable) Method is used to check whether a HashSet object is a subset of the specified collection.
Syntax:
mySet1.IsSubsetOf(mySet2);
Here mySet1 and mySet2 are HashSets.
Return Type: This method returns true if the HashSet object is a subset of another subset otherwise, 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:
using System;
using System.Collections.Generic;
class GFG {
public static void Main()
{
HashSet< int > mySet1 = new HashSet< int >();
for ( int i = 1; i <= 5; i++)
mySet1.Add(2 * i);
HashSet< int > mySet2 = new HashSet< int >();
for ( int i = 1; i <= 10; i++)
mySet2.Add(i);
Console.WriteLine(mySet1.IsSubsetOf(mySet2));
}
}
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Example 2:
using System;
using System.Collections.Generic;
class GFG {
public static void Main()
{
HashSet< int > mySet1 = new HashSet< int >();
HashSet< int > mySet2 = new HashSet< int >();
for ( int i = 1; i <= 10; i++)
mySet2.Add(i);
Console.WriteLine(mySet1.IsSubsetOf(mySet2));
}
}
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Reference:
Last Updated :
01 Feb, 2019
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