.NET 4.0 // C# // WF

Running Workflows in .NET 4.0

Workflows can be run synchronously and asynchronously. Below is an example how you run a workflow instance synchronously: Dictionary<string, object> inputs = new Dictionary(); inputs.Add("InArgument", "SomeValue"); inputs.Add("InOutArgument", "SomeOtherValue"); WorkflowElement activity = workflow; IDictionary<string, object> outputs = WorkflowInvoker.Invoke(new MyWorkflow(), inputs); MyObject obj = (MyObject)outputs["OutArgument"]; MyOtherObject obj = (MyOtherObject)outputs["InOutArgument"]; Note that now workflows have arguments as well as parameters. Arguments are for passing data to and from the Workflow where parameters are for internal use. Remember: Workflow is an activity so the same goes for any custom activity you create. Any In or In/Out arguments have to be passed to the workflow for it to execute. Now here is a very simplified example of how to run a workflow instance asynchronously. The OnCompleted event is raised when the workflow has finished running and the IDictionary<string, object> outputs can be read off of the WorkflowCompletedEventArgs. ManualResetEvent resetEvent = new ManualResetEvent(false); WorkflowInstance instance = new WorkflowInstance(new MyWorkflow()); instance.OnCompleted = delegate(WorkflowCompletedEventArgs e) { Console.WriteLine("workflow instance completed, Id = " + instance.Id); resetEvent.Set(); }; instance.Run(); resetEvent.WaitOne(); I haven't done it yet but I presume running a workflow in IIS and interacting with it before it finishes would not be as staighforward as the examples above.

Designing WCF Workflow Services in .NET Framework 4.0

Not an easy task given the sparse documentation and the magnitude of change Microsoft has presented to developers. Workflow terminology has changed also, so State Machine Workflow is now called Flowchart and Sequential Workflow is called Sequence. Deploying the Workflow as a WCF Service is supposed to be easier but it’s still not without a learning curve. Below are a few places to start: I'll update this when I delve into this further.

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