HashSet<T>.IsSubsetOf Method

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

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

public bool IsSubsetOf(
	IEnumerable<T> other


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

Return Value

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




other is null.

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.


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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