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ISet<T>.IsProperSubsetOf Method

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

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

bool IsProperSubsetOf(
	IEnumerable<T> other
)

Parameters

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 correct subset of other; otherwise, false.

ExceptionCondition
ArgumentNullException

other is null.

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.

Silverlight

Supported in: 5, 4

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

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