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:
Example 2:
