WorkflowQueue.UnregisterForQueueItemAvailable Metode

Definisi

Ruang nama:

System.Workflow.Runtime

Rakitan:

System.Workflow.Runtime.dll

Membatalkan pendaftaran pelanggan ke acara.QueueItemAvailable

public:
 void UnregisterForQueueItemAvailable(System::Workflow::ComponentModel::IActivityEventListener<System::Workflow::ComponentModel::QueueEventArgs ^> ^ eventListener);

public void UnregisterForQueueItemAvailable (System.Workflow.ComponentModel.IActivityEventListener<System.Workflow.ComponentModel.QueueEventArgs> eventListener);

member this.UnregisterForQueueItemAvailable : System.Workflow.ComponentModel.IActivityEventListener<System.Workflow.ComponentModel.QueueEventArgs> -> unit

Public Sub UnregisterForQueueItemAvailable (eventListener As IActivityEventListener(Of QueueEventArgs))

Parameter

eventListener

IActivityEventListener<QueueEventArgs>

Pelanggan yang QueueEventArgs mengimplementasikan IActivityEventListener<T> antarmuka.

Pengecualian

ArgumentNullException

eventListener adalah referensi null (Nothing di Visual Basic).

Contoh

Contoh kode berikut menunjukkan bagaimana Anda dapat membuat WorkflowQueue dengan memanggil WorkflowQueuingService.GetWorkflowQueue metode . Ini juga menggunakan UnregisterForQueueItemAvailable untuk membatalkan pendaftaran pendengar yang ditentukan.

Contoh kode ini adalah bagian dari Sampel SDK Aktivitas Pengamat File dari file FileSystemEvent.cs. Untuk informasi selengkapnya, lihat Aktivitas Pengamat Sistem File.

private void DoUnsubscribe(ActivityExecutionContext context, IActivityEventListener<QueueEventArgs> listener)
{
    if (!this.subscriptionId.Equals(Guid.Empty))
    {
        FileWatcherService fileService = context.GetService<FileWatcherService>();
        fileService.UnregisterListener(this.subscriptionId);
        this.subscriptionId = Guid.Empty;
    }

    WorkflowQueuingService qService = context.GetService<WorkflowQueuingService>();
    WorkflowQueue queue = qService.GetWorkflowQueue(this.QueueName);

    queue.UnregisterForQueueItemAvailable(listener);
}

Private Sub DoUnsubscribe(ByVal context As ActivityExecutionContext, ByVal listener As IActivityEventListener(Of QueueEventArgs))
    If Not Me.subscriptionId.Equals(Guid.Empty) Then
        Dim fileService As FileWatcherService = context.GetService(Of FileWatcherService)()
        fileService.UnregisterListener(Me.subscriptionId)
        Me.subscriptionId = Guid.Empty
    End If

    Dim qService As WorkflowQueuingService = context.GetService(Of WorkflowQueuingService)()
    Dim queue As WorkflowQueue = qService.GetWorkflowQueue(Me.QueueName)
    queue.UnregisterForQueueItemAvailable(listener)
End Sub

Lihat juga

• Aktivitas Pengamat Sistem File