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The whole persistence model has changed quite a but for WF4. The persistence class out of the box is called SqlWorkflowInstanceStore and as the name suggests it saves workflow data in either SQL Server 2005 or 2008. It is based on the InstanceStore...
Flowcharts are a nice addition to Windows Workflow Foundation 4. They allow for a lot of pretty complex behavior that is hard to do in a sequential workflow. In WF 3 we used to model these complex behaviors as state machine workflows. That worked but...
When using Windows Workflow Foundation 4 you often need to enter expression in some activity property. The new thing is these expressions are all in the Visual Basic dialect regardless of what language you project is in. So when developing a project in...
Creating parameters for a workflow is quite easy to do in WF 4. Just open the arguments tab in the workflow and add each input or output parameter you need and the required type. Now in WF 3 passing data to a workflow was done using a Dictionary<string...
In the previous blog posts, here , here and here , I demonstrated how to use WCF from WF4. This same some more about sending multiple messages to the same workflow, AKA Workflow Correlation. One of the ugly parts of Windows Workflow Foundation...
In the previous two blog posts ( here and here ) I showed how to create and expose a Windows Workflow Foundation 4 workflow via WCF and have both a workflow and a regular C# client work with it. But the parameter and return value where real simple with...
In a previous blog post I described how to use the WorkflowServiceHost and host a workflow with a Receive activity that waits for WCF messages. I also added a WF4 client that called the service and received a response. However a lot of clients out there...
Michael Kennedy , one of the co instructors from DevelopMentor , has created a combined feed from all the blogs of the various DevelopMentor. An awesome group of people with a lot of knowledge to share. Highly recommended in you RSS reader. http://feeds...
There are several ways to use WCF in combination with Windows Workflow Foundation 4. The two can be combined inside of a XAMLX file as Ron Jacobs describes here . Another option is using the WF4 Receive and SendReply activities and hosting the workflow...
One thing that has completely changed in Windows Workflow Foundation is the way we work with data in a workflow. In WF 3 we used properties to store data. We could use regular .NET properties but most of the time dependency properties where the...
Passing parameters into a workflow is similar in WF4 as it was in WF3. In both case a Dictionary<string, object> is passed in when creating the workflow instance object. Alternatively when using the WF4 WorkflowInvoker you can pass it into the Invoke...
With WF3 there was a central workflow runtime environment called the WorkflowRuntime and used to manage the lifetime of workflow instances. In WF4 this central class no longer exists and we manage individual workflows. To compare the two, this is what...
As you may have heard Windows Workflow Foundation 4 is not an upgrade from Windows Workflow Foundation 3 (or 3.5). The version numbers might suggest that the previous version was quite mature but in fact it refers to the version of the .NET framework...