WorkflowEventArgs.WorkflowInstance Properti

Definisi

Ruang nama:

System.Workflow.Runtime

Rakitan:

System.Workflow.Runtime.dll

Mendapatkan instans alur kerja yang terkait dengan peristiwa alur kerja.

public:
 property System::Workflow::Runtime::WorkflowInstance ^ WorkflowInstance { System::Workflow::Runtime::WorkflowInstance ^ get(); };

public System.Workflow.Runtime.WorkflowInstance WorkflowInstance { get; }

member this.WorkflowInstance : System.Workflow.Runtime.WorkflowInstance

Public ReadOnly Property WorkflowInstance As WorkflowInstance

Nilai Properti

WorkflowInstance

Yang WorkflowInstance terkait dengan peristiwa alur kerja.

Contoh

Contoh kode berikut menunjukkan cara mendapatkan WorkflowInstance objek menggunakan WorkflowInstance properti saat metode penanganan aktivitas dipanggil. WorkflowIdled Ketika peristiwa terjadi, metode yang OnWorkflowIdled ditentukan dalam contoh ini dipanggil. Ini menentukan alur kerja mana yang diam menggunakan WorkflowInstance properti dan kemudian mendapatkan kumpulan item antrean untuk instans alur kerja dengan memanggil GetWorkflowQueueData metode . Kode melakukan iterasi atas koleksi untuk menentukan aktivitas mana yang menunggu peristiwa yang menganggur alur kerja. Kemudian mengirimkan pengecualian ke antrean alur kerja menggunakan EnqueueItem metode bersama dengan nama item antrean peristiwa.

Contoh kode ini adalah bagian dari Membatalkan Sampel SDK Alur Kerja dari file Program.cs. Untuk informasi selengkapnya, lihat Membatalkan Alur Kerja.

static void OnWorkflowIdled(object sender, WorkflowEventArgs e)
{
    WorkflowInstance workflow = e.WorkflowInstance;

    Console.WriteLine("\n...waiting for 3 seconds... \n");
    Thread.Sleep(3000);

    // what activity is blocking the workflow
    ReadOnlyCollection<WorkflowQueueInfo> wqi = workflow.GetWorkflowQueueData();
    foreach (WorkflowQueueInfo q in wqi)
    {
        EventQueueName eq = q.QueueName as EventQueueName;
        if (eq != null)
        {
            // get activity that is waiting for event
            ReadOnlyCollection<string> blockedActivity = q.SubscribedActivityNames;
            Console.WriteLine("Host: Workflow is blocked on " + blockedActivity[0]);

            // this event is never going to arrive eg. employee left the company
            // lets send an exception to this queue
            // it will either be handled by exception handler that was modeled in workflow
            // or the runtime will unwind running compensation handlers and exit the workflow
            Console.WriteLine("Host: This event is not going to arrive");
            Console.WriteLine("Host: Cancel workflow with unhandled exception");
            workflow.EnqueueItem(q.QueueName, new Exception("ExitWorkflowException"), null, null);
        }
    }
}

Shared Sub OnWorkflowIdled(ByVal sender As Object, ByVal e As WorkflowEventArgs)
    Dim workflow As WorkflowInstance = e.WorkflowInstance

    Console.WriteLine(vbCrLf + "...waiting for 3 seconds... " + vbCrLf)
    Thread.Sleep(3000)

    ' what activity is blocking the workflow
    Dim wqi As ReadOnlyCollection(Of WorkflowQueueInfo) = workflow.GetWorkflowQueueData()
    For Each q As WorkflowQueueInfo In wqi

        Dim eq As EventQueueName = TryCast(q.QueueName, EventQueueName)

        If eq IsNot Nothing Then
            ' get activity that is waiting for event
            Dim blockedActivity As ReadOnlyCollection(Of String) = q.SubscribedActivityNames
            Console.WriteLine("Host: Workflow is blocked on " + blockedActivity(0))

            ' this event is never going to arrive eg. employee left the company
            ' lets send an exception to this queue
            ' it will either be handled by exception handler that was modeled in workflow
            ' or the runtime will unwind running compensation handlers and exit the workflow
            Console.WriteLine("Host: This event is not going to arrive")
            Console.WriteLine("Host: Cancel workflow with unhandled exception")
            workflow.EnqueueItem(q.QueueName, New Exception("ExitWorkflowException"), Nothing, Nothing)
        End If
    Next
End Sub

Lihat juga

• Membatalkan Alur Kerja