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HashSet<T>.IsSubsetOf Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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

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

Syntax

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

public bool IsSubsetOf(
    IEnumerable<T> other
)

Parameters

Return Value

Type: System.Boolean
true if the HashSet<T> object is a subset of other; otherwise, false.

Implements

ISet<T>.IsSubsetOf(IEnumerable<T>)

Exceptions

Exception Condition
ArgumentNullException

other is nulla null reference (Nothing in Visual Basic).

Remarks

An empty set is a subset of any other collection, including an empty set; therefore, this method returns true if the collection represented by the current HashSet<T> object is empty, even if the other parameter is an empty set.

This method always returns false if Count is greater 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 Count and m is the number of elements in other.

Version Information

Silverlight

Supported in: 5, 4

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.