Workflow versioning - Handle error in definitions in a user-friendly manner

Hello Savy,
Thank you for using our workflow module. I should consult with our developers regarding this issue. We will answer you ASAP.
Thanks,
Anatol

Hello Savy,
I apologize for the delayed response.
With the default functionality, the only way to resolve this problem is to delete the incorrect version. You can also extend this functionality in the following way:

1. Create a navigation item for the DevExpress.ExpressApp.Workflow.Versioning.XpoUserActivityVersion ListView.
2. Add the following controller to your application:

C#
             public class ShowWorkflowInstancesForActivityVersionController : ViewController<ObjectView> {  
    internal const string ActiveKey_HasAccessToRunningWorkflowInstanceInfoType = "HasAccessToRunningWorkflowInstanceInfoType";  
    internal const string ActiveKey_NonRunningWorkflowInstanceInfoType = "NonRunningWorkflowInstanceInfoType";  
    internal const string ListViewCriteriaName = "RunningWorkflowInstanceInfoViewer";  

    private void ShowWorkflowInstances_Execute(object sender, SimpleActionExecuteEventArgs e) {  
        ShowWorkflowInstances(e);  
    }  
    protected virtual void ShowWorkflowInstances(SimpleActionExecuteEventArgs e) {  
        ListView listView = Application.CreateListView(Application.CreateObjectSpace(), RunningWorkflowInstanceInfoType, true);  
        string workflowId = ((DevExpress.ExpressApp.Workflow.Versioning.XpoUserActivityVersion)(e.CurrentObject)).WorkflowUniqueId + "_" + ((DevExpress.ExpressApp.Workflow.Versioning.XpoUserActivityVersion)(e.CurrentObject)).Version;  
        listView.CollectionSource.Criteria[ListViewCriteriaName] = new BinaryOperator("WorkflowUniqueId", workflowId);  
        e.ShowViewParameters.CreatedView = listView;  
        e.ShowViewParameters.TargetWindow = TargetWindow.NewWindow;  
    }  
    public ShowWorkflowInstancesForActivityVersionController() {  
        TargetObjectType = typeof(DevExpress.ExpressApp.Workflow.Versioning.XpoUserActivityVersion);  
        ShowWorkflowInstancesAction = new SimpleAction(this, "ShowWorkflowInstancesForActivityVersion", WorkflowModule.WorkflowActionCategory);  
        ShowWorkflowInstancesAction.ImageName = "Action_Workflow_ShowWorkflowInstances";  
        ShowWorkflowInstancesAction.SelectionDependencyType = SelectionDependencyType.RequireSingleObject;  
        ShowWorkflowInstancesAction.Execute += new SimpleActionExecuteEventHandler(ShowWorkflowInstances_Execute);  
    }  
    protected override void OnViewChanging(View view) {  
        base.OnViewChanging(view);  
        if(RunningWorkflowInstanceInfoType != null) {  
            Active[ActiveKey_HasAccessToRunningWorkflowInstanceInfoType] =  
                SecuritySystem.IsGranted(new ObjectAccessPermission(RunningWorkflowInstanceInfoType, ObjectAccess.Read));  
            Active[ActiveKey_NonRunningWorkflowInstanceInfoType] =  
                view is ObjectView && view.ObjectTypeInfo != null && !typeof(IRunningWorkflowInstanceInfo).IsAssignableFrom(view.ObjectTypeInfo.Type);  
        }  
    }  
    protected override void OnActivated() {  
        Frame.GetController<DevExpress.ExpressApp.Workflow.Controllers.RunningWorkflowInstanceInfoViewer>().Active["ByActivityVersionsViewer"] = false;  
        base.OnActivated();  
    }  
    protected override void OnDeactivated() {  
        Frame.GetController<DevExpress.ExpressApp.Workflow.Controllers.RunningWorkflowInstanceInfoViewer>().Active.RemoveItem("ByActivityVersionsViewer");  
        base.OnDeactivated();  
    }  
    protected override void OnFrameAssigned() {  
        base.OnFrameAssigned();  
        if(Frame.Application != null) {  
            WorkflowModule module = Frame.Application.Modules.FindModule<WorkflowModule>();  
            if(module != null) {  
                RunningWorkflowInstanceInfoType = module.RunningWorkflowInstanceInfoType;  
            }  
        }  
        Active["RunningWorkflowInstanceInfoType"] = (RunningWorkflowInstanceInfoType != null);  
    }  

    public SimpleAction ShowWorkflowInstancesAction { get; private set; }  
    public Type RunningWorkflowInstanceInfoType { get; set; }  
}  

As a result, it will be possible to view versions where the error occurs, see what workflows were started for them and how they were finished. Based on this information, it will be possible to decide whether it is required to exit XAML, wait for the workflow completion, or delete version immediately.
We are going to provide a better way to handle erroneous definitions. For example, we will probably be able to reuse the workflow versioning mechanism that MS is going to provide in .NET Framework 4.5. I have converted your report to a suggestion. You will be automatically notified when its state is changed.
Thanks,
Anatol