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Editorial Team
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Asked: 2026-05-27T01:07:04+00:00

I am building up a workflow using the ActivityBuilder and ActivityXamlServices class. When I

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I am building up a workflow using the ActivityBuilder and ActivityXamlServices class. When I try to view the outputted XAML in Workflow Designer, I get the following error: ArgumentNullException (errors in SetFlowElementModelItem). It seems as though the workflow designer is having trouble parsing the XAML. If I hand edit the XAML (comparing it to a manually created workflow), I can get it to display. There are some minor differeces such as:

The generated XAML uses the StartNode Attribute (i.e. StartNode=”{x:Reference __ReferenceID5}”) whereas the manually created workflow’s XAML uses a StartNode element (i.e. …)

Also, the generated XAML does not have any elements.

I find it odd that a workflow created by .NET cannot be loaded by .NET.

Has anyone encountered this issue before?

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1 Answer

  1. Editorial Team

    It turns out it was an issue with the FlowSwitch activity. We were not adding an activity to its list of nodes. Also, we were not setting the class name.

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