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HashSet(Of T).IntersectWith Method

.NET Framework 4

Modifies the current HashSet(Of T) object to contain only elements that are present in that object and in the specified collection.

Namespace:  System.Collections.Generic
Assembly:  System.Core (in System.Core.dll)
C#
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public void IntersectWith(
	IEnumerable<T> other
)

Parameters

other
Type: System.Collections.Generic.IEnumerable(Of T)
The collection to compare to the current HashSet(Of T) object.

Implements

ISet(Of T).IntersectWith(IEnumerable(Of T))
Exception Condition
ArgumentNullException

other is Nothing.

If the collection represented by the other parameter is a HashSet(Of T) collection with the same equality comparer as the current HashSet(Of T) object, 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.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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Alternate Name
Another name for this method would be RemoveAllExcept, or RetainOnly. It removes all items from the current set, except those in the passed collection.
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