HashSet<T>::IsProperSupersetOf Method (IEnumerable<T>^)
Determines whether a HashSet<T> object is a proper superset of the specified collection.
Assembly: System.Core (in System.Core.dll)
Parameters
- other
-
Type:
System.Collections.Generic::IEnumerable<T>^
The collection to compare to the current HashSet<T> object.
Return Value
Type: System::Booleantrue if the HashSet<T> object is a proper superset of other; otherwise, false.
| Exception | Condition |
|---|---|
| ArgumentNullException | other is null. |
An empty set is a proper superset of any other collection. Therefore, this method returns true if the collection represented by the other parameter is empty unless the current HashSet<T> collection is also empty.
This method always returns false if Count is less 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, this method is an O(n) operation. Otherwise, this method is an O(n + m) operation, where n is the number of elements in other and m is Count.
The following example creates two disparate HashSet<T> objects and compares them to each other. In this example, allNumbers is both a superset and a proper superset of lowNumbers until allNumbers is modified, using the IntersectWith method, to contain only values that are present in both sets. Once allNumbers and lowNumbers are identical, allNumbers is still a superset of lowNumbers but is no longer a proper superset.
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1