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Windows Workflow Foundation offers two condition types: CodeCondition and RuleConditionReference.

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The short version is that OnActivityExecutionContextLoad and OnActivityExecutionContextUnload bookend the activity's memory lifetime as far as the Windows Workflow Foundation (WF) runtime is concerned. OnActivityExecutionContextLoad will be called just after an activity is loaded into the runtime's memory and OnActivityExecutionContextUnload will be called just before an activity is persisted to the database.

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See the Windows Workflow Foundation Services and Developing Windows Workflow Foundation Services sections in the WF Programming Guide for more information about the runtime service implementations.

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Windows Workflow Foundation, WF for short, is one of the technologies I work a lot with and as a consequence I own several books about WF. Comparing this book with the others I can only say it is one of the best books you can get on the subject. It has a good coverage of almost all the subject you are going to need to know. Not only is there a good coverage but the explanation and examples are very clear. Now there are a few thing missing from the book. As it was written with the .NET framework 3.0 there is no coverage of the WCF integration that comes in the form of the SendActivity and the ReceiveActivity. While this is unfortunate it is also understandable and I can only hope that the author has the time to update the book with one more chapter.

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So my advise: If you are getting into Windows Workflow Foundation make sure you buy this book!

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Programming Windows Workflow Foundation by Scott Allen If you enjoyed this article, you'll enjoy the book even more! Order now from Packt Publishing and save 10%! The base activity library in Windows Workflow contains general-purpose activities for constructing workflows. There are activities for control flow, transaction management, local communication, web services, and more. These activities appear on the toolbox window of the workflow designer. Some of these activities, like the CodeActivity, are simple. The job of the CodeActivity is to execute a block of code. Other activities, like the PolicyActivity, are more complex. The PolicyActivity can evaluate prioritized rules with forward chaining. We can build powerful workflows using just the activities inside the base activity library.

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Programming Windows Workflow Foundation by Scott Allen If you enjoyed this article, you'll enjoy the book even more! Order now from Packt Publishing and save 10%! The base activity library in Windows Workflow contains general-purpose activities for constructing workflows. There are activities for control flow, transaction management, local communication, web services, and more. These activities appear on the toolbox window of the workflow designer. Some of these activities, like the CodeActivity, are simple. The job of the CodeActivity is to execute a block of code. Other activities, like the PolicyActivity, are more complex. The PolicyActivity can evaluate prioritized rules with forward chaining. We can build powerful workflows using just the activities inside the base activity library.

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Daniel Karlsson's blogg om workflow foundation på Svenska

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This page was automatically generated when this topic (Microsoft Products Building on Windows Workflow Foundation) was renamed to MicrosoftProductsBuildingOnWindowsWorkflowFoundation on 17-10-2006 at 9:38 by -127.0.0.1.

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  • A new management product code named System Center “Service Desk” will be delivered in the second half of 2007. This product will be using Windows Workflow Foundation and Office 2007 products as a basis for automating IT across people, process and technologies and will include a core set of software automated Microsoft Operations Framework (MOF) process workflows as part of the solution.
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  • Microsoft Speech Server 2007 has just been released as a public beta and is built on Windows Workflow Foundation.
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  • Microsoft Dynamics products are building on Windows Workflow Foundation for future releases.
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For some reason a lot of people seem to think that only a single WorkflowRuntime object can be created in an AppDomain. And it isn't just the average Joe out there who seems to think so, no even book authors describe this behavior as the Workflow Foundation book I am reading now does so.

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Now I know where this perception comes from and its the original beta of Workflow Foundation way back before .NET 3.0 was released. Back then the WF team decided that only a single WorkflowRuntime would be enough for an AppDomain and created this restriction. I am not sure if they actually had a requirement or not but when people objected they listened and lifted the restriction.

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Well one of the most powerful features of Workflow Foundation is its capability to have long running workflows. Now long running workflows would not be very useful if the client application needs to keep its proxy alive for as long as it need to communicate with the workflow. Guess that would make "long running" a very relative thing. But with this technique all the client has to do is save the workflow instanceId somewhere, perhaps a database table, and it can reconnect to the same workflow at a later point in time.

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The new ReceiveActivity and SendActivity that marry Windows Workflow Foundation (WF) and Windows Communication Foundation (WCF) are really cool Smile. Getting started is easy because a new Sequential Workflow Service Library, found under WCF instead of Workflow in VS2008, uses nice defaults for everything. But sooner or later you need to change these defaults and you need to know what can be done and what can't.

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In this post I demonstrated how to create IronPython objects and call them from strongly typed .NET code. So suppose we want to do so with Windows Workflow Foundation where could we use this?

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A sample for Windows Workflow Foundation (WF) that shows how to use Windows Communication Foundation (WCF) for messaging. Sample code for Windows Workflow Foundation showing WCF integration in an Expense Reporting sample

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Author of the very usefull Programming Windows Workflow Foundation (http://www.amazon.com/Programming-Windows-Workflow-Foundation-Techniques/dp/1904811213/sr=8-1/qid=1170603496/ref=pd_bbs_sr_1/102-6483202-5176934?ie=UTF8&s=books) and also an MVP. See also his web site with online articles at http://www.OdeToCode.com.

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Windows Workflow Foundation offers two basic types for workflow, the sequential workflow and the state workflow. So when you start building a new workflow which is right one for you? Well it depends! You knew I was going to say that didn't you?

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One of the most powerful and most easily misunderstood concepts in Windows Workflow Foundation (WF) is that of new contexts executing cloned activities. Before we even define a spawned context, let's go back to the beginning ...

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It can be found in the C:\WINDOWS\Microsoft.NET\Framework\v3.0\Windows Workflow Foundation\SQL\EN folder.

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It can be found in the C:\WINDOWS\Microsoft.NET\Framework\v3.0\Windows Workflow Foundation\SQL\EN folder.

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It can be found in the C:\WINDOWS\Microsoft.NET\Framework\v3.0\Windows Workflow Foundation\SQL\EN folder.

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It can be found in the C:\WINDOWS\Microsoft.NET\Framework\v3.0\Windows Workflow Foundation\SQL\EN folder.

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The ReplicatorActivity is one of the more interesting Workflow Foundation activities to work with when you have a collection of data and want to iterate over each item. Basically just think of it as a For Each statement in regular code.

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The following are two batch files I use a lot when working with WF persistence and or tracking as I find it desirable to clear the out often. Just drop them in the "C:\WINDOWS\Microsoft.NET\Framework\v3.0\Windows Workflow Foundation\SQL\EN" directory with the four SQL scripts and recreating the required databases is just a few clicks away.

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WindowsWorkflowFoundation (WF) is one of the parts of the .NET 3.0 framework as released by Microsoft. One of the most interesting aspects of WindowsWorkflowFoundation (WF) is the separation between business process code and the actual implementation, often a requirement in ServiceOrientedArchitecture (SOA). Before WindowsWorkflowFoundation the typical scenario would be to write both the business logic and the actual implementation in CSharp (C#), VisualBasic .NET or another .NET language. The result was no clear separation between business logic and its implementation. With the release of Windows Workflow Foundation (WF) the business logic can be defined in the workflow while the actual underlying implementation is done in C#, Visual Basic .NET or another .NET language. So basically the what is done in the workflow and the how is done in traditional programming code.

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About the Windows Workflow Foundation Wiki

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This website is a Wiki dedicated to Windows Workflow Foundation. Basically everyone is encouraged to add their wisdom and knowledge about WF to this site, either by starting new topics or by adding to or changing existing ones.

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There are a number of things in Windows Workflow Foundation that appear to be a bit inconsistent to me.

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One thing I don’t like about Workflow Foundation is the way you need to provide parameters for a workflow. At a time where we try to as much as possibly strongly typed, so the compiler can warn us about types, we are forced to revert back to a string that must match.

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       Presentations.Image(federation.LinkMaker.LinkToImage("images/WindowsWorkflowFoundation3.png"), "WIndows Workflow Foundation", "http://www.WindowsWorkflowFoundation.eu")