Hi

I know that workflows published as Webservices use the asp.net session as default correlation for the workflow instances. This is OK but not what I need (I Think at least)

I have a WinForm GUI that needs to call this Workflow Web Service with delayed intervals like Create Booking, Confirm booking.

So I need to make sure that I call the right workflow instance on the Workflow Webservice when the based on eg. a dropdown box with workflow instaces.

So how do I do this Custom correlation on web services. http://msdn.microsoft.com/msdnmag/issues/06/04/CuttingEdge/default.aspx talks about a HTTP Module takes care of the Session => Workflow instance mapping. Do i need to make such a HTTP module my self?

If yes, how do I do that?, and if no, where should I look then?

Regards
Anders Jacobsen

Ok. I have looked a little further and can see that WWF by default adds a HttpModule called WorkflowWebHostingModule.

I have looked at this with Reflector and can see it extracts the wf instance id from the cookie and add it like this:

HttpContext.Current.Items.Add("__WorkflowInstanceId__", new Guid(cookie1.Value));

Would it be correct to implement my own HttpModule and replace it with the default WorkflowWebHostingModule?

My new idea is to add the workflow instance id in the SOAP Header in the web service request and do something like this on every request

private void OnAcquireRequestState(object sender, EventArgs e)
{
string guidid = MyCustomMethodThatCanExtractMyWorkflowIdFromSoapheader();

HttpContext.Current.Items.Add("__WorkflowInstanceId__", new Guid(guidid));
}

Is this all wrong? If not. How do I extract that Workflow id in the HttpModule? Can I access it there?

Looking forward to hear from you guys.

Thanks
Anders

I'm not in a place to say that it is supported, but it works. :)

I've done similar things using data from the message body itself and placed the id in that context item.

Matt