HashSet<T>.Clear Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Removes all elements from a HashSet<T> object.
public:
virtual void Clear();
public void Clear ();
abstract member Clear : unit -> unit
override this.Clear : unit -> unit
Public Sub Clear ()
Implements
Examples
The following example creates and populates a HashSet<T> collection, then clears it and releases the memory referenced by the collection.
HashSet<int> Numbers = new HashSet<int>();
for (int i = 0; i < 10; i++)
{
Numbers.Add(i);
}
Console.Write("Numbers contains {0} elements: ", Numbers.Count);
DisplaySet(Numbers);
Numbers.Clear();
Numbers.TrimExcess();
Console.Write("Numbers contains {0} elements: ", Numbers.Count);
DisplaySet(Numbers);
void DisplaySet(HashSet<int> set)
{
Console.Write("{");
foreach (int i in set)
{
Console.Write(" {0}", i);
}
Console.WriteLine(" }");
}
/* This example produces output similar to the following:
* Numbers contains 10 elements: { 0 1 2 3 4 5 6 7 8 9 }
* Numbers contains 0 elements: { }
*/
Imports System.Collections.Generic
Class Program
Shared Sub Main()
Dim Numbers As HashSet(Of Integer) = New HashSet(Of Integer)()
For i As Integer = 0 To 9
Numbers.Add(i)
Next i
Console.Write("Numbers contains {0} elements: ", Numbers.Count)
DisplaySet(Numbers)
Numbers.Clear()
Numbers.TrimExcess()
Console.Write("Numbers contains {0} elements: ", Numbers.Count)
DisplaySet(Numbers)
End Sub
' This code example produces output similar to the following:
' Numbers contains 10 elements: { 0 1 2 3 4 5 6 7 8 9 }
' Numbers contains 0 elements: { }
Private Shared Sub DisplaySet(ByVal coll As HashSet(Of Integer))
Console.Write("{")
For Each i As Integer In coll
Console.Write(" {0}", i)
Next i
Console.WriteLine(" }")
End Sub
End Class
Remarks
Count is set to zero and references to other objects from elements of the collection are also released. The capacity remains unchanged until a call to TrimExcess is made.
This method is an O(n
) operation, where n
is Count.
Applies to
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