6 באוקטובר 2009

no comments

I am looking at WF 4.0 lately and I found out that there is no clear documentation on PersistenceParticipants.

Well The idea is simple:
If you want to add some state to your workflow persistence data or in other words save some more data with your workflow, you can use a PersistenceParticipant.

The PersistenceParticipant is a class that holds your data but also implements IPersistenceParticipant interface. This interface makes it possible to load and unload the data.

PersistenceParticipant is a great extensibility point with which you can hook extra work to the persistence events.

The PersistenceParticipant has to be bound to the workflow instance using:
void IActivityExtensionProvider.EnsureExtensions(IExtensionHost host)
        if (host.GetExtension<StepCountExtension>() == null)
            host.Extensions.Add(new YourPersistenceParticipant ());

To get hold of the participant from inside or outside the workflow use: the GetExtension<YourPersistenceParticipant>() method of the workflow instance or the CodeActivityContext.

There is a great example in the wf_wcf 4.0 samples

Add comment
facebook linkedin twitter email

Leave a Reply

Your email address will not be published.

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>