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

By Mark J Collins

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0 because the previous set of activities and services 21 CHAPTER 1 ■ BUILDING A SIMPLE WORKFLOW were carried forward with minimal changes. 0, however, is a completely new design. 0 are not interchangeable with previous versions. 5 approach. 0 paradigm; either will work fine. But you cannot switch back and forth, except for a few scenarios that are described later in this book. 5, there was a code class and a designer class. The code class contained the implementation for the CodeActivity objects.

Switch Activity The Switch activity works like a switch statement in C#. It allows you to execute a sequence of activities based on the expression being evaluated. You will use the Switch activity to evaluate the ShippingMethod to determine the appropriate handling charge. In the Toolbox, the Switch activity is listed as Switch. 51 CHAPTER 4 n PASSING ARGUMENTS This means it is defined as a template class and can operate on different data types. Drag a Switch activity onto the workflow below the Assign activity.

It will default to Int32, which it what you'll need. Just click the OK button on the Select Types prompt. Draw a connection from the “Morning”, “Afternoon”, and “Evening” activities to the FlowSwitch activity. A FlowSwitch activity has a single property called Expression, which resolves to a set of values that define the branches. In this project, you’ll display a different greeting depending on the season. In the Properties window, select the Expression property and then click the ellipses. Month Mod 12) + 1) / 4) n Note The syntax of this expression might be surprising.

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