CreateWorkflow - throws exception "The input workflow type must be an Activity"

Question

My code is taken from the VS 2010 help file for Workflow class:

Typetype = typeof(ImportXml);

WorkflowInstanceworkflowInstance = WfRuntime.CreateWorkflow(type);

Where ImportXml is my Workflow - it is actually a Flowchart.

The exception "The input workflow type must be an Activity" is thrown.  The base type of ImportXml is System.Activities.Activity so I don't understand this.

Answer 1

Hi,

We use WorkflowRuntime in Workflow 3(WF3) to host workflow and workflow service. However, Flowchart is not available in WF3, it is available in Workflow 4(WF4). Please make sure the target framework of your project is .NET Framework 4 or later version, then you can host your workflow by using WorkflowInvoker or WorkflowApplication. For example:

WorkflowApplication wfApp = new WorkflowApplication(new ImportXml());

wfApp.Run();

For more information about hosting workflows in WF4, you can refer to:

Hosting Workflows

http://msdn.microsoft.com/en-us/library/dd489446.aspx

If you still want to use WF3, then you need to use StateMachine workflow instead of FlowChart. Thanks.

---

Leo Tang [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.