WF

[ToolboxItem(false)]

• When I expose a workflow as a service, I am under a workflow context. The problem I have is that I want to list workflows in a particular state (e.g. all workflows ready to be validated), So the user can select and re-start processing. Is this easy/possible without exposing another WCF service?
• Is there any way to tie the workflow state to the instance of the object under question. For example, if I have a transaction with its flag set to

public partial class Request : System.Web.UI.Page
{
private WorkflowRuntime runtime;
private RequestService objReqService;
private Dictionary<string, StateMachineWorkflowInstance> stateMachineInstances;
 
private void StartWorkflowRuntime()
        {
            // Create a new Workflow Runtime for this application

            runtime = new WorkflowRuntime();
        EventHandlers for the WorkflowRuntime
 
            runtime.WorkflowTerminated += new EventHandler<WorkflowTerminatedEventArgs>(Runtime_WorkflowTerminated);
            runtime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(Runtime_WorkflowCompleted);
            runtime.WorkflowIdled += new EventHandler<WorkflowEventArgs>(Runtime_WorkflowIdled);            
 
            // Add the External Data Exchange Service
            ExternalDataExchangeService dataExchangeService = new ExternalDataExchangeService();
            runtime.AddService(dataExchangeService);
 
            //Adding Persistnace Service
            string connStringPersistence = ConfigurationManager.ConnectionStrings["WFPersistence"].ConnectionString;
            //Using Sql Persistance
            SqlWorkflowPersistenceService sqlPersistance = new SqlWorkflowPersistenceService(connStringPersistence, true, new TimeSpan(500, 0, 0), new TimeSpan(100, 0, 0));
            runtime.AddService(sqlPersistance);
 
            SqlTrackingService sqltracking = new SqlTrackingService(connStringPersistence);
            runtime.AddService(sqltracking);
 

            //// Add a new instance of the OrderService to the External Data Exchange Service
            objReqService = new RequestService();
            dataExchangeService.AddService(objReqService);
 
            //// Start the Workflow services
            runtime.StartRuntime();
 
            stateMachineInstances = new Dictionary<string, StateMachineWorkflowInstance>();
        }
 
private Guid StartRequestWorkflow()
        {
            // NOTE:  "Late-binding to the OrderWorkflows" assembly so we
            // ...can easily copy this exe and project into another soluton

            // Load the RequestWorkflows assembly
            Assembly RequestWorkflowsAssembly = Assembly.Load("Test");
 
            // Get a reference to the System.Type for the OrderWorkflows.iPriceFlow
            Type workflowType = RequestWorkflowsAssembly.GetType("WorkFlow.Test");
 
            if (workflowType == null) return Guid.Empty;
            //runtime = new WorkflowRuntime();
            WorkflowInstance instance = runtime.CreateWorkflow(workflowType);
 
            StateMachineWorkflowInstance stateMachineInstance = new StateMachineWorkflowInstance(runtime, instance.InstanceId);
 
            instance.Start();
 
            // Add the StateMachineInstance object for our Workflow to our dictionary
            stateMachineInstances.Add(instance.InstanceId.ToString(), stateMachineInstance);
 
            // Return the WorkflowInstanceId
            return instance.InstanceId;
        }
protected void btnSubmitReq_Click(object sender, EventArgs e)
{
StartWorkflowRuntime();
Guid workflowInstanceId = StartRequestWorkflow();
objReqService.RaiseRequestCreatedEvent(ReqID, workflowInstanceId);
}
 
}
 

public partial class Approval : System.Web.UI.Page
{
private WorkflowRuntime runtime;
private RequestService objReqService;
private Dictionary<string, StateMachineWorkflowInstance> stateMachineInstances;
 
private void StartWorkflowRuntime()
        {
            // Create a new Workflow Runtime for this application

            runtime = new WorkflowRuntime();
        EventHandlers for the WorkflowRuntime
 
            runtime.WorkflowTerminated += new EventHandler<WorkflowTerminatedEventArgs>(Runtime_WorkflowTerminated);
            runtime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(Runtime_WorkflowCompleted);
            runtime.WorkflowIdled += new EventHandler<WorkflowEventArgs>(Runtime_WorkflowIdled);            
 
            // Add the External Data Exchange Service
            ExternalDataExchangeService dataExchangeService = new ExternalDataExchangeService();
            runtime.AddService(dataExchangeService);
 
            //Adding Persistnace Service
            string connStringPersistence = ConfigurationManager.ConnectionStrings["WFPersistence"].ConnectionString;
            //Using Sql Persistance
            SqlWorkflowPersistenceService sqlPersistance = new SqlWorkflowPersistenceService(connStringPersistence, true, new TimeSpan(500, 0, 0), new TimeSpan(100, 0, 0));
            runtime.AddService(sqlPersistance);
 
            SqlTrackingService sqltracking = new SqlTrackingService(connStringPersistence);
            runtime.AddService(sqltracking);
 

            //// Add a new instance of the OrderService to the External Data Exchange Service
            objReqService = new RequestService();
            dataExchangeService.AddService(objReqService);
 
            //// Start the Workflow services
            runtime.StartRuntime();
 
            stateMachineInstances = new Dictionary<string, StateMachineWorkflowInstance>();
        }
 
protected void bntApproveRequest_Click(object sender, EventArgs e)
{
 
StartWorkflowRuntime();
string strGUI = Request.GetGUI(RequestID);
Guid workflowInstanceId = new Guid(strGUI);//= StartRequestWorkflow();
WorkflowInstance instance = runtime.GetWorkflow(workflowInstanceId); (Here Im getting error)
.....
...
}
}

ReadOnlyCollection<WorkflowQueueInfo> subActivities = stateMachineInstance.WorkflowInstance.GetWorkflowQueueData();
Collection<string> MessagesAllowed = new Collection<string>();
foreach (WorkflowQueueInfo queueInfo in subActivities)
{
    // Cast the Queue Name to the class Event Queue Name to get the event name string
    EventQueueName queuename = queueInfo.QueueName as EventQueueName;
 
    if (queuename != null)
    {
        MessagesAllowed.Add(queuename.MethodName);
    }
}