HashSet<T>::IsSupersetOf Method (IEnumerable<T>^)

 

Determines whether a HashSet<T> object is a superset of the specified collection.

Namespace:   System.Collections.Generic
Assembly:  System.Core (in System.Core.dll)

public:
virtual bool IsSupersetOf(
	IEnumerable<T>^ other
) sealed

Parameters

other
Type: System.Collections.Generic::IEnumerable<T>^

The collection to compare to the current HashSet<T> object.

Return Value

Type: System::Boolean

true if the HashSet<T> object is a superset of other; otherwise, false.

Exception Condition
ArgumentNullException

other is null.

All collections, including the empty set, are supersets of the empty set. Therefore, this method returns true if the collection represented by the other parameter is empty, even if the current HashSet<T> object is empty.

This method always returns false if Count is less than 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.

No code example is currently available or this language may not be supported.

Universal Windows Platform
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
Return to top
Show: