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SharePoint workflow object model

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Get a brief introduction to the workflow object model in SharePoint.

Note

SharePoint 2010 workflows have been retired since August 1, 2020 for new tenants and removed from existing tenants on November 1, 2020. If you’re using SharePoint 2010 workflows, we recommend migrating to Power Automate or other supported solutions. For more info, see SharePoint 2010 workflow retirement.

SharePoint workflow object model

The SharePoint object model is built on top of the .NET Framework 4 object model for Windows Workflow Foundation 4, but with innovations that enable workflow functionality in SharePoint generally, and in SharePoint Add-ins in particular. The native .NET Framework 4 object model for Windows Workflow Foundation 4 is located in the .NET Framework System.Workflow namespaces.

One way to think of the SharePoint workflow object model is as a set of workflow services. There are four services:

  • Instance management service: Manages workflow instances and their execution.

  • Deployment service: Manages the deployment of workflow definitions.

  • Interop service: Manages the interop bridge for supporting legacy workflows.

  • Messaging service: Manages message queuing and transport.

SharePoint workflow namespaces

The SharePoint workflow object model, on the other hand, is contained in ten namespaces: five of them are SharePoint namespaces, and five others are Microsoft Office namespaces.

Microsoft.SharePoint namespaces:

Microsoft.Office namespaces:

SharePoint workflow schemas

Reference content for SharePoint schemas is contained in the reference node entitled Workflow schemas, and contain the following:

See also