Managing Messages
Windows workflow provides a set of messaging activities that enable you to expose your workflow as a WCF service as well as call out to other services. There are a number of message-based activities, each designed to enable you to configure various message exchange patterns including Request-Response (or Send-Receive Reply). These activities also support correlation to make sure the right workflow instance gets the right message. Figure 23.16 shows the Messaging activities in the Toolbox.
Figure 23.16 You use the Messaging activities to define send and receive message constructs for your workflow.
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