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GetWorkflowQueueData Method

WorkflowInstance.GetWorkflowQueueData Method

Gets a collection of WorkflowQueueInfo objects that contains the pending items and subscribed activities for the workflow queues associated with this workflow instance.

Namespace: System.Workflow.Runtime
Assembly: System.Workflow.Runtime (in system.workflow.runtime.dll)

public ReadOnlyCollection<WorkflowQueueInfo> GetWorkflowQueueData ()
public ReadOnlyCollection<WorkflowQueueInfo> GetWorkflowQueueData ()
public function GetWorkflowQueueData () : ReadOnlyCollection<WorkflowQueueInfo>
Not applicable.

Return Value

A ReadOnlyCollection of WorkflowQueueInfo objects.

Exception typeCondition

InvalidOperationException

The workflow runtime engine is not running.

GetWorkflowQueueData returns a collection of WorkflowQueueInfo objects, each of which contains information about the state of one of the workflow queues associated with this workflow instance. WorkflowQueueInfo.Items contains the pending items for a WorkflowQueue and WorkflowQueueInfo.SubscribedActivityNames contains a list of the activities that are subscribed for item delivery on a WorkflowQueue.

The following code example demonstrates how you can use the GetWorkflowQueueData method to obtain information about the state of all workflow queues associated with a WorkflowInstance object. When the WorkflowIdled event occurs, the OnWorkflowIdled method defined in this example is called. It determines which workflow is idled using the WorkflowInstance property and then gets a collection of queued items for the workflow instance by calling the GetWorkflowQueueData method. The code iterates over the collection to determine which activity is waiting for the event that idled the workflow. It then sends an exception to the workflow queue using the EnqueueItem method along with the name of the event queue item.

This code example is part of the Canceling a Workflow SDK sample from the Program.cs file. For more information, see Canceling a Workflow.

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);
        }
    }
}

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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