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Windows Workflow: Build Custom Activities To Extend The Reach Of Your Workflows

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

This article covers the core components required for building custom activities in Windows Workflow Foundation.

Matt Milner

MSDN Magazine December 2006

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Custom sequence activity deriving from System.Workflow.Activities.SequenceActivity

Hi, I try to create custom sequence activity. I found some sample (http://social.msdn.microsoft.com/Forums/en-US/wfprerelease/thread/f54e8eb2-29d9-46f6-ad96-766fe6fad333/). But this custom activity looks ugly (to separate nested activity using ellipses instead of arrows). My question is - how to create custom sequence activity, which will look like sequence activity. I also found this sample - <ContentPresenter x:Uid="ContentPresenter_1" Content="{Binding}" Style="{x:Static sacdt:DesignerStylesDictionary.SequenceStyle}"/> When I used this ContentPresenter my custom activity looks like System.Workflow.Activities.SequenceActivity, but I couldn't put on it another activity. I also created class, which derives from System.Workflow.Activities.SequenceActivity, but I couldn't see it in toolbox. My question is - how to create class, which derives from System.Workflow.Activities.SequenceActivity and is visible in toolbox or how to use ContentPresenter for sequence activity, which allows put on itself another activity.

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I'm using some custom designers in a workflow and occasionally get a combo of errors that don't make much sense.

On the designer surface, the following error is shown:

Cannot create unknown type '{clr-namespace:HurrDurr.Activities}MyActivity'.
System.Xaml.XamlObjectWriterException: Cannot create unknown type '{clr-namespace:HurrDurr.Activities}MyActivity'.
   at System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType)
   at blah blah yadda yadda...

In the error list, I get the following error:

Error 1 XC1020: Build error occurred in the XAML MSBuild task: 'The value ' ' contains significant white space(s) but "xml:space = preserve" cannot be written down on the member '{clr-namespace:HurrDurr.Activities;assembly=HurrDurr}MyActivity.Variables'.'

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I have a siteA at



and Site B at



when i try and use the
Copy List Item Extended Activity to copy the list items across i keep getting error:

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http://myserverA:8080    Default     http://myserverA:8080

http://myserverA.domainname:8080  Default  http://myserverA.domainname:8080

http://myserverA.domainname:2020 Default     http://myserverA.domainname:2020  -- this is been extended for FBA

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