Supporting multiple output
You can implement multiple output in custom workflow actions, in which multiple values can be captured and stored during the execution of the custom workflow action.
To implement multiple output in a custom workflow action, you must apply additional Nintex Workflow 2013 export (.nwp) file functionality to the custom workflow activity, the custom workflow action adapter, and the configuration page:
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Dependency properties and storage handling must be added to the custom workflow activity. For more information, see Implementing multiple output in the workflow activity.
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Configuration support must be added to the AddActivityToWorkflow, GetConfig, GetDefaultConfig, and ValidateConfig methods of the workflow adapter class derived from the GenericRenderingAction base class. For more information, see Implementing multiple output in the workflow adapter.
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The MultiOutputControl control, from the Nintex.Workflow.ApplicationPages namespace, must be added to the configuration page, to allow users to configure multiple outputs for the custom workflow action. For more information, see Interacting with multiple output.