Determines whether a HashSet<T> object is a proper subset of the specified collection.
Assembly: System.Core (in System.Core.dll)
Return ValueType: System.Boolean
true if the HashSet<T> object is a proper subset of other; otherwise, false.
An empty set is a proper subset of any other collection. Therefore, this method returns true if the collection represented by the current HashSet<T> object is empty unless the other parameter is also an empty set.
This method always returns false if Count is greater than or equal to the number of elements in other.
If the collection represented by other is a HashSet<T> collection with the same equality comparer as the current HashSet<T> object, then this method is an O(n) operation. Otherwise, this method is an O(n + m) operation, where n is Count and m is the number of elements in other.
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