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12 Quick Reference
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To Use a Rule Condition instead of a Code Condition Use policy in your workflow Indicate dependencies between rules Do This In the Condition property for the given conditional activity, select Declarative Rule Condition and provide the rule. Drag and drop an instance of the Policy activity into your workflow, and edit the RuleSet according to your processing needs. Dependencies between rules amount to fields and properties (workflow state) that are shared between rules. To indicate dependencies that might not be automatically understood by the rules engine, use any of the rules-based attributes (RuleRead, RuleWrite, and RuleInvoke) or use the Update statement explicitly. Set the forward chaining action to Sequential. Each rule will be processed once in the order it is stored. Set the forward chaining action to Explicit Chaining, and use the Update statement where fields and property values are modified. Set the rule reevaluation mode (found in the RuleSet editor) to either Always or Never. Always allows the rules engine to reevaluate the rule as necessary. Never allows the rule to be processed only once and never reevaluated.
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Deactivate forward chaining Take control of forward chaining from the WF rules engine Control how individual rules are reevaluated
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13
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Crafting Custom Activities
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After completing this chapter, you will be able to:
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Understand what components are necessary to create a fully functional custom workflow activity Create a basic custom workflow activity Apply validation rules to a basic custom workflow activity Integrate a basic custom workflow activity into the Microsoft Visual Studio visual workflow designer and Toolbox
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As deep and functional as Windows Workflow Foundation (WF) is, it can t possibly encompass everything you might want to achieve with your workflows. Even though WF is still very new to the development community, many freely distributed custom activities are already available, and you can be sure commercial-grade activities eventually will follow. In this chapter, you ll get a look inside WF by creating a new workflow activity, one that retrieves a file from a remote File Transfer Protocol (FTP) server. You ll see what pieces are necessary, as well as what parts are nice to have when building your own activity. You ll also dig a little into how activities interact with the workflow runtime. Note
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It won t be possible to explore every nuance of custom activity development in a single chapter. There are simply too many details. However, the good news is it s easy to get a fully functional activity working without knowing every detail. Where there is more detail, I ll provide links to more information.
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More About Activities
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In 4, Introduction to Activities and Workflow Types, we took an initial look at activities and discussed topics such as the ActivityExecutionContext, which is used to contain information about executing activities the workflow runtime needs to access from time to time. We ll dig into WF activities a little deeper here.
Part II
Working with Activities
Activity Virtual Methods
The first thing to know when creating custom activities is what the base class provides you by way of virtual methods and properties. Table 13-1 shows the commonly overridden methods for Activity. (There are no virtual properties.)
Table 13-1 Commonly Overridden Activity Virtual Methods Method Cancel Compensate Purpose Invoked when the workflow is canceled. This method isn t actually implemented by the Activity base class but rather required by the ICompensatableActivity interface from which many activities derive. Therefore, for all intents and purposes it is an Activity method. You ll implement this method to compensate for failed transactions. The main activity worker method, Execute, is used to perform the work that the activity was designed to perform. Called when internal activity code throws an unhandled exception. Note there is no way to restart the activity once this method is invoked. Called when the activity is initialized. Called when the activity is handed an ActivityExecutionContext for processing. Called when the activity has finished its workflow process. The current execution context is being shifted to another activity. Called when the activity is to be uninitialized.
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