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Get Beginning WF : Windows Workflow in .NET 4.0 PDF

By Mark J Collins

ISBN-10: 1430224851

ISBN-13: 9781430224853

ISBN-10: 143022486X

ISBN-13: 9781430224860

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Displaying the FlowSwitch expression Adding the FlowStep Activities Each branch of a FlowSwitch activity is called a FlowStep. Although there is no FlowStep activity in the Toolbox, and you don’t explicitly add these branches to the workflow, they are created internally as you draw connections from the FlowSwitch activity. Drag five WriteLine activities onto your workflow near the FlowSwitch activity. Set the DisplayName on each of these to Winter, Spring, Summer, Autumn, and Default. Draw a connection from the FlowSwitch to each of the WriteLine activities.

The Activity class is the base class from which all workflow activities are derived, including Sequence. So the compiler returns the Sequence instance as its base class, Activity. Implementing Level 1 So far, you have defined an empty Sequence activity. This is roughly equivalent to creating a new workflow that has a Sequence with no activities. Now, define the activities on this Sequence by replacing the call to return new Sequence() with the code shown in Listing 2-1. Listing 2-1. ToString() }, new If() { DisplayName = "Greeting" // Code to be added here in Level 2 } } }; ■ Note This implementation relies heavily on creating anonymous class instances.

The diagram should look like the one shown in Figure 4-12. Figure 4-12. Switch activity with cases defined 52 CHAPTER 4 n PASSING ARGUMENTS The designer shows all the defined cases with one of them expanded so you can see the activity associated with that case. You can click one of the Add an activity links to expand a collapsed case. Expression Activities So far, you have defined the NextDay and 2ndDay cases plus the default case, which is used when the ShippingMethod value is not one of the defined cases.

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Beginning WF : Windows Workflow in .NET 4.0 by Mark J Collins


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