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The BusinessBase class implemented in 3 includes support for validation rules. Each rule is a method with a signature that conforms to the RuleHandler delegate. A business object can implement business rules conforming to this delegate, and then associate those rule methods with the properties of the business object. Most applications use a relatively small, common set of validation rules such as that a string value is required or has a max length, or that a numeric value has a minimum or maximum value. Using reflection, it is possible to create highly reusable rule methods which is the purpose behind the Csla.Validation.CommonRules class. Obviously, using reflection incurs some performance cost, so these reusable rule methods may or may not be appropriate for every application. However, the code reuse offered by these methods is very powerful, and most applications won t be adversely affected by this use of reflection. In the end, whether you decide to use these rule methods or not is up to you.

Note Objects such as a BackgroundWorker are two-faced : they have some methods and events that are for use from the main thread and some that are for use on the worker thread. This is common in concurrent programming. In particular, be careful to understand which thread an event is raised on. For BackgroundWorker, the RunWorkerAsync and CancelAsync methods are for use from the GUI thread, and the ProgressChanged and RunWorkerCompleted events are raised on the GUI thread. The DoWork event is raised on the worker thread, and the ReportProgress method and the CancellationPending property are for use from the worker thread when handling this event.

If reflection-based rules are problematic for your application, you can implement hard-coded rule methods on a per-object basis.

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The members in Table 13-1 show two additional facets of BackgroundWorker objects: they can optionally support protocols for cancellation and reporting progress. To report progress percentages, a worker must simply call the ReportProgress method, which raises the ProgressChanged event in the GUI thread. For cancellation, a worker computation need only check the CancellationPending property at regular intervals, exiting the computation as a result.

If you find the idea of these reusable rules appealing and useful, you may opt to create your own library of reusable rules as part of your application. In that case, you ll want to add a class to your project similar to CommonRules, and you can use the rule methods from CommonRules as a guide for building your own reusable rule methods.

Create a text node with the value of key: var dtitle_text = document.createTextNode(key); We have created two nodes. The element node is assigned to the variable dtitle. The text node is assigned to the variable dtitle_text. Use the appendChild method to put the text node inside the element node: dtitle.appendChild(dtitle_text); Repeat the process for the dd element: var ddesc = document.createElement("dd"); This time, create a text node with the value of the variable definition: var ddesc_text = document.createTextNode(definition); Again, append the text node to the element node: ddesc.appendChild(ddesc_text); Now we have two element nodes: dtitle and ddesc. These element nodes contain the text nodes dtitle_text and ddesc_text. Before finishing the loop, append your newly created dt and dd elements to the dl element you created earlier. The dl element has been assigned to the variable dlist: dlist.appendChild(dtitle); dlist.appendChild(ddesc); Here is the finished for/in loop: for (key in defs) { var definition = defs[key]; var dtitle = document.createElement("dt"); var dtitle_text = document.createTextNode(key); dtitle.appendChild(dtitle_text); var ddesc = document.createElement("dd"); var ddesc_text = document.createTextNode(definition); ddesc.appendChild(ddesc_text); dlist.appendChild(dtitle); dlist.appendChild(ddesc); } At this stage, our definition list is complete. It exists in JavaScript as a DocumentFragment. All that remains to do is to insert it into the document.

Capturing common control patterns such as cancellation and progress reporting is an absolutely essential part of mastering concurrent programming However, one of the problems with NET classes such as BackgroundWorker is that they are often more imperative than an F# programmer may want, and they force other common patterns to be captured by using mutable data structures shared between threads This leads to the more difficult topic of shared-memory concurrency, which we discuss later in the chapter Furthermore, the way BackgroundWorker handles cancellation means that flag-checks and early-exit paths have to be inserted in the executing background process Finally, BackgroundWorker is not useful for background threads that perform asynchronous operations, since the background thread will exit too early, before the callbacks for the asynchronous operations have executed.

The RuleHandler delegate specifies that every rule method accepts two parameters: a reference to the object containing the data, and a RuleArgs object that is used to pass extra information into and out of the rule method. The base RuleArgs object has a PropertyName property that provides the rule method with the name of the property to be validated. It also includes a Description property that the rule method should set for a broken rule to describe why the rule was broken.

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