workflow-foundation-4

I should insert a list of objects in a database using a workflow for each object, the inserting process could take several time and waiting for some external input so I have to save persistent state in db, and it works correctly. Now I need to show pending objects in my user interface, how can I retrieve variables of stored data?? Thank you, Marco See How to: Deserialize Instance Data Properties 来源： https://stackoverflow.com/questions/7530839/get-a-list-of-persistent-objects-stored-in-database

I'd like to validate the workflow within the design surface (in this case, Visual Studio) from within one of the child Activities' designer. I'd like to prevent users from moving forward until other errors are corrected in order to simplify the design experience later down the road. The naiive implementation doesn't work: var activity = (this.ModelItem.Root.GetCurrentValue() as ActivityBuilder) .Implementation as Activity; var validationResult = ActivityValidationServices.Validate(activity); if (validationResult.Errors.Count > 0)) { MessageBox.Show("The Workflow is invalid. Fix it.", "Derp");

In unit test, i passed the assembly of Custom Activity to the ctor as the local assembly var xamlInjector = new XamlInjector("CreditAtRenewalFlow.xaml", typeof(CreateFollowUp).Assembly); CreateFollowUp is a AsynCodeActivity I got error "'Unexpected 'PROPERTYELEMENT' in parse rule 'Element ::= . EmptyElement | ( StartElement ElementBody ).'.' Line number '2' and line position '4'." at execution of the following line var host = WorkflowInvokerTest.Create(xamlInjector.GetActivity()); The sample of the unit test is [TestMethod] [DeploymentItem(@"src\ProcessFlows\Activity1.xaml")] public void

Is it possible to work with a sub-workflow (i.e. subset of the workflow in the designer). For example a sequence, a flowchart, or any activity inside the workflow. My idea is something like these: Save the subworkflow to a file (for example, save the selected Sequence activity) Load a saved subworkflow and add it into current workflow Add a sub-workflow as an item in toolbox Are these even possible in WF4? Sounds very much like your sub worklfows are just composite activities. Doing so is easy if you compile them as they become regular activity types and you can do with them as you like. If

I'm having trouble trying to attach a custom tracking participant in workflow foundation 4.0. I have a class that inherits from TrackingParticipant but I cannot see any other way of attaching it to my WorkflowServiceHost other than through lots of messy app.config entries like the SDK example demonstrates below (in the system.servicemodel element). This option seems to require a lot of extra overhead and classes to be created, when I just want a simple custom tracking participant to listen to my CustomTrackingRecord.Data.Add(key, value) calls. public class CustomTracking : TrackingParticipant

I am trying to understand how one can resume (load) a previously persisted WF4 activity without knowing the concrete type of the activity. In order to load a persisted activity, I not only need its workflowId (which I have), but I need to pass in an instance of the activity too - so I need to know it's type: var workflowApplication = new WorkflowApplication(activity); // what type is activity? workflowApplication.Load(workflowId); The problem is that it could be one of a number of types - this activity is intended to be used within other activities and workflows: it sends a message to a