HashSet<T>::Add Method (T)
Adds the specified element to a set.
Assembly: System.Core (in System.Core.dll)
Parameters
- item
-
Type:
T
The element to add to the set.
Return Value
Type: System::Booleantrue if the element is added to the HashSet<T> object; false if the element is already present.
Implements
ISet<T>::Add(T)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.
The following example demonstrates how to create and populate two HashSet<T> objects. This example is part of a larger example provided for the UnionWith method.
HashSet<int> evenNumbers = new HashSet<int>(); HashSet<int> oddNumbers = new HashSet<int>(); for (int i = 0; i < 5; i++) { // Populate numbers with just even numbers. evenNumbers.Add(i * 2); // Populate oddNumbers with just odd numbers. oddNumbers.Add((i * 2) + 1); }
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1