HashSet<T>.UnionWith(IEnumerable<T>) Méthode

Définition

Espace de noms:

System.Collections.Generic

Assembly:

System.Collections.dll

Source:

HashSet.cs

Modifie l'objet HashSet<T> actif afin qu'il contienne tous les éléments qui sont présents dans cet objet, dans la collection spécifiée ou dans les deux.

public:
 virtual void UnionWith(System::Collections::Generic::IEnumerable<T> ^ other);

public void UnionWith (System.Collections.Generic.IEnumerable<T> other);

abstract member UnionWith : seq<'T> -> unit
override this.UnionWith : seq<'T> -> unit

Public Sub UnionWith (other As IEnumerable(Of T))

Paramètres

other

IEnumerable<T>

Collection à comparer à l'objet HashSet<T> actif.

Implémente

UnionWith(IEnumerable<T>)

Exceptions

ArgumentNullException

other a la valeur null.

Exemples

L’exemple suivant montre comment fusionner deux ensembles disparates. Cet exemple crée deux HashSet<T> objets et les remplit respectivement avec des nombres pairs et impairs. Un troisième HashSet<T> objet est créé à partir de l’ensemble qui contient les nombres pairs. L’exemple appelle ensuite la UnionWith méthode, qui ajoute le nombre impair défini au troisième ensemble.

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);
}

Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count);
DisplaySet(evenNumbers);

Console.Write("oddNumbers contains {0} elements: ", oddNumbers.Count);
DisplaySet(oddNumbers);

// Create a new HashSet populated with even numbers.
HashSet<int> numbers = new HashSet<int>(evenNumbers);
Console.WriteLine("numbers UnionWith oddNumbers...");
numbers.UnionWith(oddNumbers);

Console.Write("numbers contains {0} elements: ", numbers.Count);
DisplaySet(numbers);

void DisplaySet(HashSet<int> collection)
{
    Console.Write("{");
    foreach (int i in collection)
    {
        Console.Write(" {0}", i);
    }
    Console.WriteLine(" }");
}

/* This example produces output similar to the following:
* evenNumbers contains 5 elements: { 0 2 4 6 8 }
* oddNumbers contains 5 elements: { 1 3 5 7 9 }
* numbers UnionWith oddNumbers...
* numbers contains 10 elements: { 0 2 4 6 8 1 3 5 7 9 }
*/

Imports System.Collections.Generic

Class Program

    Shared Sub Main()

        Dim evenNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()
        Dim oddNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()

        For i As Integer = 0 To 4

            ' Populate evenNumbers with only even numbers.
            evenNumbers.Add(i * 2)

            ' Populate oddNumbers with only odd numbers.
            oddNumbers.Add((i * 2) + 1)
        Next i

        Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count)
        DisplaySet(evenNumbers)

        Console.Write("oddNumbers contains {0} elements: ", oddNumbers.Count)
        DisplaySet(oddNumbers)

        ' Create a new HashSet populated with even numbers.
        Dim numbers As HashSet(Of Integer) = New HashSet(Of Integer)(evenNumbers)
        Console.WriteLine("numbers UnionWith oddNumbers...")
        numbers.UnionWith(oddNumbers)

        Console.Write("numbers contains {0} elements: ", numbers.Count)
        DisplaySet(numbers)
    End Sub


    Private Shared Sub DisplaySet(ByVal collection As HashSet(Of Integer))
        Console.Write("{")
        For Each i As Integer In collection
            Console.Write(" {0}", i)
        Next i
        Console.WriteLine(" }")
    End Sub

End Class
' This example produces output similar to the following:
' evenNumbers contains 5 elements: { 0 2 4 6 8 }
' oddNumbers contains 5 elements: { 1 3 5 7 9 }
' numbers UnionWith oddNumbers...
' numbers contains 10 elements: { 0 2 4 6 8 1 3 5 7 9 }

Remarques

Cette méthode est une opération O(n), où n est le nombre d’éléments dans le other paramètre.