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Drawing UPC A in C#.NET Part I

Part I
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Introducing Windows Workflow Foundation (WF)
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How the activities choose what to accomplish as the next step in the process they model is a primary focus of this chapter. Perhaps the activities are executed in an order you specified when you created the root activity. Or it s just as likely you ll need a workflow designed such that specific activities will execute only after certain events have occurred. So that we have a pretty good understanding of activities in general, let s look first at the WF Activity object by itself and then look at how activities are connected together.
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Introducing the Activity, the Basic Unit of Work
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Moving from conceptual notion to concrete implementation, WF provides you with the Activity object. By itself, Activity implements a simplistic-looking base class. It doesn t do much taskwise, but it does allow for workflow interaction (which is not simple). However, activity objects that derive from Activity do provide tremendous functionality, and that s just using activities that ship with WF. You are certainly free to create your own activities, a topic we ll visit in 13, Custom Activities. In fact, the entire second part of the book is dedicated to activities. But looking for now at the base Activity object, Table 4-1 lists many of the Activity properties of general interest, and Table 4-2 lays out the methods you ll typically encounter. In 13 you ll see a couple more that are useful when creating your own activities.
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Table 4-1 Property Description Enabled ExecutionResult ExecutionStatus
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Purpose Gets or sets the user-defined description of the activity. Gets or sets a value that indicates whether this instance is enabled for execution and validation. Gets the ActivityExecutionResult of the last attempt to run this instance (Canceled, Compensated, Faulted, None, and Succeeded). Gets the status of the workflow in the form of one of the ActivityExecutionStatus values (Canceling, Closed, Compensating, Executing, Faulting, and Initialized). Gets or sets the name of this activity instance. Gets the activity that encloses this activity. Gets the workflow instance identifier associated with this activity.
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Name Parent WorkflowInstanceId Table 4-2 Method Cancel Clone Execute GetActivityByName Load
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Activity Methods
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Purpose Cancels the execution of an activity. Returns a deep copy of the activity ( deep copy means the clone contains all of the internal data from the cloned activity). Synchronously runs the activity. If executed on a composite activity, this method returns the named activity if it is contained by the composite activity. Loads an instance of an activity from a stream.
4
Introduction to Activities and Workflow Types
Table 4-2 Method RaiseEvent
Activity Methods
Purpose Raises an event associated with the specified DependencyProperty. Raises the event associated with the referenced DependencyProperty. The effect of RaiseEvent and RaiseGenericEvent is the same fire an event. RaiseEvent uses the dependency property directly, while RaiseGenericEvent is the generic (templated) version. Saves a copy of the activity to a stream.
RaiseGenericEvent<T>
Save
The activity methods are generally all both virtual and protected. The intention is for you to override them and provide implementations specific to your own activity s needs. By far the most critical method is Execute. This method, when called by the workflow runtime, is the method where your activity s magic happens. Activities can be grouped into two primary camps: composite and basic. Composite activities contain other activities, and an excellent example of this is the sequential activity we ve been using throughout the book so far. All the sample applications so far have implemented their workflow instances as sequential activities that contained other activities, such as if-else, delay, and code activities. Basic activities, such as the delay and code activities I just mentioned, are the single-minded task-based activities I referred to earlier in the chapter. Ultimately, you ll need basic activities to actually carry out specific pieces of work. Composite activities might direct the flow of work and data, but it s the basic activity that does the number crunching.
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