IsSubsetOf Generic Method

Wintellect PowerCollections

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[This topic is pre-release documentation and is subject to change in future releases. Blank topics are included as placeholders.]

Determines if one collection is a subset of another, considered as sets. The first set is a subset of the second set if every item in the first set also occurs in the second set. If an item appears X times in the first set, it must appear at least X times in the second set.

Namespace: Wintellect.PowerCollections
Assembly: PowerCollections (in PowerCollections.dll)

Syntax

C#
public static bool IsSubsetOf<T>( IEnumerable<T> collection1, IEnumerable<T> collection2, IEqualityComparer<T> equalityComparer )

Visual Basic (Declaration)
Public Shared Function IsSubsetOf(Of T) ( _ collection1 As IEnumerable(Of T), _ collection2 As IEnumerable(Of T), _ equalityComparer As IEqualityComparer(Of T) _ ) As Boolean

Visual C++
public: generic<typename T> static bool IsSubsetOf ( IEnumerable<T>^ collection1, IEnumerable<T>^ collection2, IEqualityComparer<T>^ equalityComparer )

Parameters

collection1: IEnumerable<(Of <T>)>
The first collection.

collection2: IEnumerable<(Of <T>)>
The second collection.

equalityComparer: IEqualityComparer<(Of <T>)>
The IEqualityComparer<T> used to compare items for equality.

Return Value

True if collection1 is a subset of collection2, considered as sets.

Type Parameters

T

Remarks

If both collections are Set, Bag, OrderedSet, or OrderedBag collections, it is more efficient to use the IsSubsetOf method on that class.

Exceptions

Exception	Condition
System..::ArgumentNullException	collection1 or collection2 is null.