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This chapter began by explaining how communication between workflow and other applications can be accomplished. I provided an example of how to create a service class and an interface along with the use of the CallExternalMethod, Listen, and HandleExternalEvent activities. This chapter concluded with a discussion of fault or exception handling within workflows. The next chapter will discuss how to create your own custom activities to use and reuse within your workflows, just like creating a class library.
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Custom Activities
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ll the chapters to this point have provided details about and showed examples of the out-of-the-box activities provided with WF. However, you might need to use the existing activities to create new activities specifically for your problem domain. WF has provided extensibility so you can expand the set of activities available from which to build workflows. This chapter will explain the steps involved in creating a custom activity for both a Sequential workflow and a State Machine workflow.
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Basics of a Custom Activity
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You can derive a custom activity from either an out-of-the-box activity or another custom activity. To build a simple custom activity, create a new VB Workflow Activity Library called SimpleActivity. When the new project opens, you ll see the designer has an activity in it to which you can add other activities. You use this to create a composite activity made up of either multiple out-of-the-box activities or your custom activities. Change the name of Activity1.vb in the Solution Explorer to SimpleActivity. Remember that an activity is simply a class, so you can work with it in that way. SimpleActivity inherits from the Sequence activity by default. View the properties of the SimpleActivity activity and you ll see the Base Class property, which has already been set to System.Work flow.Activities.SequenceActivity. You can also add a description that will be shown when the activity is in the Toolbox. Add This is a simple activity as the description. Add a Code activity to the activity called SimpleCode. Generate the Handler for the Code activity and add msgbox("Simple") to the resulting sub. Add another Code activity called ActivityCode. Generate the Handler for the Code activity and add msgbox("Activity") to the resulting sub. Add a new VB Sequential Workflow Console Application to the solution called VBCustomActivitySequentialConsole. As soon as the solution is opened, build the solution. Once the solution is built, view the Toolbox and you ll see there s a new activity called SimpleActivity, as shown in Figure 8-1.
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Figure 8-1. New SimpleActivity in the Toolbox
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CHAPTER 8 CUSTOM ACTIVITIES
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Drag the SimpleActivity from the Toolbox to the Sequential workflow. Click your mouse on the SimpleActivity. The result should look like Figure 8-2.
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Figure 8-2. SimpleActivity within a Sequential workflow Notice the description for the SimpleActivity is the description entered when creating the activity. Also notice there s a lock in the upper-left corner of each Code activity within the SimpleActivity. This lets you know you cannot make changes to these activities. If you click one of the Code activities inside the SimpleActivity and view the properties, you ll see the properties are all disabled. Execute the workflow, and you ll see the Simple message box appear and then the Activity message box appear. This example shows a simple composite activity made up of existing activities. You can also create activities from scratch by inheriting from the Activity class. The next section will show creating a new activity from the Activity class. Creating a new activity in this manner is the same in VB or C#. Also, you can change the base class activity from Sequential activity to State activity to create an activity that can be used in a State Machine workflow. The same steps are involved in both, so I won t show creating a State activity. This example has shown how to use a custom activity if the activity project and workflow project are in the same solution. In most cases, this won t happen. Instead, you ll create a new workflow project and you ll want to add an existing custom activity to the workflow. To show how this works, close the solution and create a new VB Sequential Workflow Console application called VBCustomActivityToolBoxSequential. View the Toolbox and notice you no longer see the SimpleActivity within the Toolbox. Right-click the Toolbox and select Choose Items. The Choose Toolbox Items dialog box appears with several tabs. Click the Activities tab, and you ll see all the out-of-the-box activities listed. Also notice the directory column for these activities is Global Assembly Cache. You can add your activity to the Global Assembly Cache if you d like. However, if you do this, you ll need to do it on every workstation that might have a workflow application running on it and that uses that activity. The upside to adding a custom activity to the Global Assembly Cache is that you don t need to add it to every project you create. So if you have an activity for example, a logging activity that you want to add to every
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