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BlockingCollection<T>.GetConsumingEnumerable Méthode

Définition

Fournit un IEnumerable<T> de consommation pour les éléments de la collection.

Surcharges

GetConsumingEnumerable(CancellationToken)

Fournit un IEnumerable<T> de consommation pour les éléments de la collection.

GetConsumingEnumerable()

Fournit un IEnumerable<T> de consommation pour les éléments de la collection.

GetConsumingEnumerable(CancellationToken)

Source:
BlockingCollection.cs
Source:
BlockingCollection.cs
Source:
BlockingCollection.cs

Fournit un IEnumerable<T> de consommation pour les éléments de la collection.

public:
 System::Collections::Generic::IEnumerable<T> ^ GetConsumingEnumerable(System::Threading::CancellationToken cancellationToken);
public System.Collections.Generic.IEnumerable<T> GetConsumingEnumerable (System.Threading.CancellationToken cancellationToken);
member this.GetConsumingEnumerable : System.Threading.CancellationToken -> seq<'T>
Public Function GetConsumingEnumerable (cancellationToken As CancellationToken) As IEnumerable(Of T)
Public Iterator Function GetConsumingEnumerable (cancellationToken As CancellationToken) As IEnumerable(Of T)

Paramètres

cancellationToken
CancellationToken

Jeton d'annulation à observer.

Retours

IEnumerable<T> qui supprime et retourne des éléments de la collection.

Exceptions

BlockingCollection<T> a été supprimé ou le CancellationTokenSource qui a créé cancellationToken a été supprimé

Remarques

Cette méthode permet au code client de supprimer des éléments de la collection à l’aide d’une boucle foreach (For Each en Visual Basic) ou Parallel.ForEach d’une requête PLINQ. L’énumérateur continue à fournir des éléments (le cas échéant) jusqu’à ce IsCompleted que retourne true, et si IsCompleted a la valeur false, la boucle bloque jusqu’à ce qu’un élément soit disponible ou jusqu’à ce que le CancellationToken soit annulé.

Voir aussi

S’applique à

GetConsumingEnumerable()

Source:
BlockingCollection.cs
Source:
BlockingCollection.cs
Source:
BlockingCollection.cs

Fournit un IEnumerable<T> de consommation pour les éléments de la collection.

public:
 System::Collections::Generic::IEnumerable<T> ^ GetConsumingEnumerable();
public System.Collections.Generic.IEnumerable<T> GetConsumingEnumerable ();
member this.GetConsumingEnumerable : unit -> seq<'T>
Public Function GetConsumingEnumerable () As IEnumerable(Of T)

Retours

IEnumerable<T> qui supprime et retourne des éléments de la collection.

Exceptions

Exemples

L’exemple suivant montre comment utiliser la GetConsumingEnumerable méthode :

class ConsumingEnumerableDemo
{
    // Demonstrates:
    //      BlockingCollection<T>.Add()
    //      BlockingCollection<T>.CompleteAdding()
    //      BlockingCollection<T>.GetConsumingEnumerable()
    public static async Task BC_GetConsumingEnumerable()
    {
        using (BlockingCollection<int> bc = new BlockingCollection<int>())
        {
            // Kick off a producer task
            var producerTask = Task.Run(async () =>
            {
                for (int i = 0; i < 10; i++)
                {
                    bc.Add(i);
                    Console.WriteLine($"Producing: {i}");

                    await Task.Delay(100); // sleep 100 ms between adds
                }

                // Need to do this to keep foreach below from hanging
                bc.CompleteAdding();
            });

            // Now consume the blocking collection with foreach.
            // Use bc.GetConsumingEnumerable() instead of just bc because the
            // former will block waiting for completion and the latter will
            // simply take a snapshot of the current state of the underlying collection.
            foreach (var item in bc.GetConsumingEnumerable())
            {
                Console.WriteLine($"Consuming: {item}");
            }
            await producerTask; // Allow task to complete cleanup
        }
    }
}
module ConsumingEnumerableDemo =
    // Demonstrates:
    //      BlockingCollection<T>.Add()
    //      BlockingCollection<T>.CompleteAdding()
    //      BlockingCollection<T>.GetConsumingEnumerable()
    let blockingCollectionGetConsumingEnumerable () =
        task {
            use bc = new BlockingCollection<int>()
            // Kick off a producer task
            let producerTask =
                task {
                    for i = 0 to 9 do
                        bc.Add i
                        printfn $"Producing: {i}"

                        do! Task.Delay 100 // sleep 100 ms between adds
                    // Need to do this to keep foreach below from hanging
                    bc.CompleteAdding()
                }

            // Now consume the blocking collection with foreach.
            // Use bc.GetConsumingEnumerable() instead of just bc because the
            // former will block waiting for completion and the latter will
            // simply take a snapshot of the current state of the underlying collection.
            for item in bc.GetConsumingEnumerable() do
                printfn $"Consuming: {item}"
            do! producerTask // Allow task to complete cleanup
        }
'Imports System.Threading.Tasks
'Imports System.Collections.Concurrent

' Demonstrates:
' BlockingCollection<T>.Add()
' BlockingCollection<T>.CompleteAdding()
' BlockingCollection<T>.GetConsumingEnumerable()

Class ConsumingEnumerableDemo
    Shared Sub BC_GetConsumingEnumerable()
        Using bc As New BlockingCollection(Of Integer)()

            ' Kick off a producer task
            Task.Factory.StartNew(
                Sub()
                    For i As Integer = 0 To 9
                        bc.Add(i)
                        ' sleep 100 ms between adds
                        Thread.Sleep(100)
                    Next

                    ' Need to do this to keep foreach below from not responding.
                    bc.CompleteAdding()
                End Sub)
            ' Now consume the blocking collection with foreach.
            ' Use bc.GetConsumingEnumerable() instead of just bc because the
            ' former will block waiting for completion and the latter will
            ' simply take a snapshot of the current state of the underlying collection.
            For Each item In bc.GetConsumingEnumerable()
                Console.WriteLine(item)
            Next
        End Using
    End Sub
End Class

Voir aussi

S’applique à