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Part 1 Part 2 Part 3 Part 4 In the previous blog posts we made sure we could have multiple versions of the same workflow running side by side. This ability is one of the more powerful concepts of WF and a real must have for long running business applications...
Part 1 Part 2 Part 3 Part 4 In the first article of this series I demonstrated how to get multiple versions of a workflow running side by side in the same workflow runtime. The most important thing was that you need to keep every version of the assembly...
Part 1 part 2 Part 3 Part 4 You may recall my previous posts about using the TransactionScopeActivity within a ReceiveActivity and all the nasty issues we ran into. Just in case you want to read them again: one , two and three . As it turn out this is...
Part 1 Part 2 Part 3 Part 4 In my previous post I demonstrated how to keep multiple versions of an assembly around and how to use the assemblyBinding element in the app.config to let the runtime load multiple versions of a worklfow. In the end we had...
Part 1 Part 2 Part 3 Part 4 One of the cool features of Windows Workflow Foundation is that it allows long running processes. And not just long running as in a few minutes but really long running as in a few years . This is possible true the use of the...
One powerful feature of a workflow is that a workflow can be changed at runtime. Like other powerful features this is something that should be done with care but it can be a real life saver at times. One of the things that you can change are Declarative...
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? Well the most obvious place would be a runtime service . The...
.NET Reflector, by Lutz Roeder, must be one of the most useful tools I have when developing .NET code. Usually it is the first thing I install right after Visual Studio not even waiting until I need it because I know I will. So the big news is that Red...
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...
It is available from the subscriptions download at http://msdn.microsoft.com/en-us/subscriptions/default.aspx Get it while it is hot Enjoy!
Part 1 part 2 Part 3 Part 4 In a previous blog post I write about what happens when you place a TransactionScopeActivity within a ReceiveActivity and an exception occurs that is supposed to roll back the transaction. In short the story was very bad and...
Part 1 part 2 Part 3 Part 4 I got an email from a friend last week asking about using a ReceiveActivity and, while receiving, using a TransactionScopeActivity to transitionally save some data in a database. Seems like a common enough scenario right? Well...
Afgelopen jaar hebben we het eerste CodeCamp in Nederland georganiseerd en dat was een groot succes. De meeste deelnemers vroegen om meer, sommige zelfs om een CodeCamp per kwartaal of een heel weekend lang. Nou hebben we dat laatste nog niet gedaan maar...
SQL Compact is a great little database and highly recommended. However it was designed for use on small compact, hence its name, devices and that has some drawbacks. One of these is that it doesn't run as a 64 bits application. And by default if you...
I have just updated the SQL Server Compact Workflow Persistence Service to better handle deserialization issues when loading a workflow. The service now makes sure the WorkflowRuntime ServicesExceptionNotHandled is raised, something it should have done...
Using an ActivityDesignerTheme is a quick way to customize the appearance of an activity in the workflow designer. But there is a gotcha Because once you applied the theme and have a workflow with the custom activity open in the designer no matter what...
When working with state machine workflow's the SetStateActivity is one of the more important activities to use. The main reason is that is the one used to transition from one state to another. You can actually transition state in a different way as...
Most people consider unit testing of custom workflow activities to pretty much impossible. Sure you can create a dummy test workflow containing your new activity, new up a WorkflowRuntime , create a WorkflowInstance and start it. But just think about...
As I mentioned in my previous blog post adding a custom ActivityValidator class to an activity validates it at runtime as well as at design time. So when is this runtime validation done and what happens when it fails? The when part is when the WorkflowInstance...
Modifying already executing workflow's is a very powerful option. Now, as with most advanced options, not something you are going to need every day but certainly something to be aware of and use when the needed. First lets take a quick look at why...
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