HashSet<T>.Remove Method
Removes the specified element from a HashSet<T> object.
Assembly: System.Core (in System.Core.dll)
Parameters
- item
- Type: T
The element to remove.
Return Value
Type: System.Booleantrue if the element is successfully found and removed; otherwise, false. This method returns false if item is not found in the HashSet<T> object.
Implements
ICollection<T>.Remove(T)If the HashSet<T> object does not contain the specified element, the object remains unchanged. No exception is thrown.
This method is an O(1) operation.
The following example demonstrates how to remove values from a HashSet<T> collection using the Remove method. In this example, zero is arbitrarily removed from the HashSet<T> collection.
static void Main()
{
HashSet<int> evenNumbers = new HashSet<int>();
for (int i = 0; i < 20; i++)
{
evenNumbers.Add(i);
}
Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count);
DisplaySet(evenNumbers);
evenNumbers.RemoveWhere(isEven);
Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count);
DisplaySet(evenNumbers);
if (evenNumbers.Contains(0))
{
evenNumbers.Remove(0);
}
Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count);
DisplaySet(evenNumbers);
}
private static bool isEven(int i)
{
return ((i % 2) == 1);
}
/* This example produces output similar to the following:
* evenNumbers contains 20 elements: { 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 }
* evenNumbers contains 10 elements: { 0 2 4 6 8 10 12 14 16 18 }
* evenNumbers contains 9 elements: { 2 4 6 8 10 12 14 16 18 }
*/
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.
