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ISet<T>.IsProperSupersetOf Method

Determines whether the current set is a proper (strict) superset of a specified collection.

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

bool IsProperSupersetOf(
	IEnumerable<T> other


Type: System.Collections.Generic.IEnumerable<T>
The collection to compare to the current set.

Return Value

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


other is null.

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

An empty set is a proper superset of any other collection. Therefore, this method returns true if the collection represented by the other parameter is empty, unless the current set is also empty.

This method always returns false if the number of elements in the current set is less than or equal to the number of elements in other.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

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.