Represents an ExternalDataExchangeService interface that enables workflow activities to request a workflow modification be enabled, and to respond when the workflow is modified, outside the workflow instance itself.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: No
You can use the OnWorkflowModified activity to respond to the event of the workflow being modified.
When this service raises an event, the event parameters are contained in the SPModificationEventArgs class.
For more information on workflow modifications, see Workflow Modification Forms (SharePoint Foundation).