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CHAPTER 9 A WORKFLOW SMORGASBORD
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Listing 9-26. A Simple Condition Method but Complete Nonetheless public static bool ReturnTrue() { return true; }
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Caution A condition is nothing more than a method that returns a Boolean value, but it must be declared
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as static because the class will not be instantiated the method will be called directly.
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As before, we need to register our condition assembly as an authorizedType in our web.config. The entry for this will follow exactly the same model as the entry for our custom action. We also need to register our condition with WSS. Again, we do this in a very similar manner adding more text to our .actions file. The options for parameters and fields are the same as for the action, with one notable exception any fields passed in to our method must be declared parameters of the method we wrote. So, for example, if we wanted to pass in the name of the current user, we would need to code our condition method to accept a string parameter. This makes a certain amount of sense if we re going to declare a parameter, our method is going to have to be able to accept it. My sample code for the .actions file is shown in Listing 9-27. This code would go right above the opening <Actions> element but below the <WorkflowInfo> element. The end result is shown in Figure 9-16. Listing 9-27. Adding a Custom Condition to the .actions File <Conditions> <Condition Name="AlwaysTrue" FunctionName="ReturnTrue" ClassName="WorkDayDate.GetWorkDayDate" Assembly="WorkDayDate, Version=1.0.0.0, Culture=neutral, PublicKeyToken=16837ed8463a28fd" AppliesTo="list" UsesCurrentItem="true"> <RuleDesigner Sentence="True"> </RuleDesigner> <Parameters> </Parameters> </Condition> </Conditions>
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Figure 9-16. Our custom condition in SPD. This step will always execute.
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CHAPTER 9 A WORKFLOW SMORGASBORD
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Activity Verbs
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Activity verbs are the options that show up on the context menu when we right-click on the activity inside the Workflow Designer of Visual Studio. The default context menu contains a number of useful elements. Figure 9-17 shows a few samples of these context menus. You can see that the menu options are different, depending on which type of activity they are attached to. From left to right, the activities are Sequence, Parallel, and Code. The options on each menu are a combination of standard items from the root ActivityDesigner type; others are added to a specific subtype, for example, CompositeActivityDesigner or ParallelActivityDesigner.
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Figure 9-17. Context menus from three different activities each with common options and options specific to that activity Wouldn t it be nice if we could add our own options for our custom activity As you ve probably guessed, we can, and it s easy. As alluded to earlier, the custom verbs are added via the activity s Designer class, which we covered in detail back in 5. I ll walk through a sample here to add a Help verb to the context menu of the MacroStripper custom activity we built back in 5. When selected, it will display a simple message box with information that will be handy to people using our activity. The first thing we need to do is add the item to the context menu. The System.Workflow. ComponentModel.Design namespace contains a class called ActivityDesignerVerb, which is what we need to work with. We need to create a new instance of this class, set a few properties, and then add it to the Designer class s Verbs collection (stored in the Verbs property). Before we can do that we ll need to create a global variable in our Designer class that will store our new ActivityDesignerVerb: ActivityDesignerVerb helpVerb; will do the trick. Now we can actually create the ActivityDesignerVerb object and add it to the Verbs collection. The perfect place to do this is in the Initialize method, which we ve already overridden in the MacroStripper activity we created in 5. The code in Listing 9-28 shows the full method. The parameters of the Add method are pretty straightforward, except perhaps the
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