HashSet<T>.Add Method

Adds the specified element to a set.

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


Public Function Add ( _
    item As T _
) As Boolean
public bool Add(
    T item


  • item
    Type: T
    The element to add to the set.

Return Value

Type: System.Boolean
true if the element is added to the HashSet<T> object; false if the element is already present.




If Count already equals the capacity of the HashSet<T> object, the capacity is automatically adjusted to accommodate the new item.

If Count is less than the capacity of the internal array, this method is an O(1) operation. If the HashSet<T> object must be resized, this method becomes an O(n) operation, where n is Count.

Version Information


Supported in: 5, 4


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