Data Exchange in Workflows
Windows Workflow Foundation communication services support data exchange between a workflow and its hosting environment. Windows Workflow Foundation communication services enable a workflow to exchange data with a local host by using the HandleExternalEventActivity and CallExternalMethodActivity classes in conjunction with interfaces that support the ExternalDataExchangeAttribute attribute.
Windows Workflow Foundation supports data exchange between workflows by using Web service communications. For information about Web service communications, see Communicating with Other Workflows.
ConceptsWindows Workflow Foundation and Application Communication
Using Local Services in Workflows
Using Correlation in Workflows
Generating Communication Activities
Communicating with Other Workflows