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  1. PO
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    <p>Windows Workflow Foundation is a very capable product but still very much in its 1st version :-(</p> <p>The main reasons for use include:</p> <ol> <li>Visually modeling business requirements.</li> <li>Separating your business logic from the business rules and externalizing rules as XML files.</li> <li>Seperating your business flow from you application by externalizing your workflows as XML files.</li> <li>Creating long running processes with the automatic ability to react if nothing has happened for some extended period of time. For example an invoice not being paid.</li> <li>Automatic persistence of long running workflows to keep resource usage down and allow a process and/or machine to restart.</li> <li>Automatic tracking of workflows helping with business requirements.</li> </ol> <p>WF comes as a library/framework so most of the time you need to write the host that instantiates the WF runtime. That said, using WCF hosted in IIS is a viable solution and saves a lot of work. However the WCF/WF coupling is less than perfect and needs some serious work. See here <a href="http://msmvps.com/blogs/theproblemsolver/archive/2008/08/06/using-a-transactionscopeactivity-with-a-wcf-receiveactivity.aspx" rel="noreferrer">http://msmvps.com/blogs/theproblemsolver/archive/2008/08/06/using-a-transactionscopeactivity-with-a-wcf-receiveactivity.aspx</a> for more details. Expect quite a few changes/enhancements in the next version.</p> <p>WF (and WCF) are pretty central to a lot of the new stuff coming out of Microsoft. You can expect some interesting announcements during the PDC.</p> <p>BTW keeping multiple versions of a workflow running takes a bit of work but that is mostly standard .NET. I just did a series of blog posts on the subject starting here: <a href="http://msmvps.com/blogs/theproblemsolver/archive/2008/09/10/versioning-long-running-workfows.aspx" rel="noreferrer">http://msmvps.com/blogs/theproblemsolver/archive/2008/09/10/versioning-long-running-workfows.aspx</a></p> <p>About visually modeling business requirements. In theory this works quite well with a separation of intent and implementation. However in practice you will drop quite a few extra activities on a workflow purely for technical reasons and that sort of defeats the purpose as You have to tell a business analyst to ignore half the shapes and lines.</p>
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    1. POWhat are your experiences with Windows Workflow Foundation?
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    1. USMaurice
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    1. CODon't suppose you'd consider updating this answer, since we're now in v4? :)
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      1. USBrian MacKay
    2. CO@Brian: Good suggestion. I will do a blog post when I have the time.
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