IsProperSubsetOf Method

ISet(Of T).IsProperSubsetOf Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Determines whether the current set is a property (strict) subset of a specified collection.

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

'Declaration
Function IsProperSubsetOf ( _
	other As IEnumerable(Of T) _
) As Boolean

Parameters

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

Return Value

Type: System.Boolean
true if the current set is a correct subset of other; otherwise, false.

ExceptionCondition
ArgumentNullException

other is Nothing.

If the current set is a proper subset of other, other must have at least one element that the current set does not have.

An empty set is a correct subset of any other collection. Therefore, this method returns true if the current set is empty, unless the other parameter is also an empty set.

This method always returns false if the current set has more or the same number of elements than other.

Windows Phone OS

Supported in: 8.1, 8.0

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