HashSet<T>.Clear 메서드

정의

HashSet<T> 개체에서 요소를 모두 제거합니다.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 ()

구현

예제

다음 예제에서는 HashSet<T> 컬렉션을 만들고 채운 다음, 컬렉션에서 참조 하는 메모리를 해제 하 고 해제 합니다.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

설명

Count는 0으로 설정 되 고 컬렉션의 요소에서 다른 개체에 대 한 참조도 해제 됩니다.Count is set to zero and references to other objects from elements of the collection are also released. TrimExcess에 대 한 호출이 수행 될 때까지 용량은 변경 되지 않은 상태로 유지 됩니다.The capacity remains unchanged until a call to TrimExcess is made.

이 메서드는 O (n) 작업, 여기서 nCount합니다.This method is an O(n) operation, where n is Count.

적용 대상