WorkflowEventArgs.WorkflowInstance Propriedade

Definição

Namespace:

System.Workflow.Runtime

Assembly:

System.Workflow.Runtime.dll

Obtém a instância de fluxo de trabalho associada ao evento de fluxo de trabalho.

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

Valor da propriedade

WorkflowInstance

O WorkflowInstance associado ao evento de fluxo de trabalho.

Exemplos

O exemplo de código a seguir demonstra como obter um WorkflowInstance objeto usando a WorkflowInstance propriedade quando um método de manipulador de eventos é chamado. Quando o WorkflowIdled evento ocorre, o OnWorkflowIdled método definido neste exemplo é chamado. Ele determina qual fluxo de trabalho está ocioso usando a WorkflowInstance propriedade e obtém uma coleção de itens enfileirados para a instância de fluxo de trabalho chamando o GetWorkflowQueueData método . O código itera sobre a coleção para determinar qual atividade está aguardando o evento que ociosidade do fluxo de trabalho. Em seguida, ele envia uma exceção para a fila de fluxo de trabalho usando o EnqueueItem método junto com o nome do item da fila de eventos.

Este exemplo de código faz parte do Exemplo de Cancelamento de um SDK de Fluxo de Trabalho do arquivo Program.cs. Para obter mais informações, consulte Cancelando um fluxo de trabalho.

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

Confira também

• Cancelando um fluxo de trabalho