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For this reason, it can often be useful to build abstractions that are similar to BackgroundWorker but that capture richer or different control patterns, preferably in a way that does not rely on the use of mutable state and that interferes less with the structure of the overall computation Much of the rest of this chapter will look at various techniques to build these control structures We start with a case study where we build a type IterativeBackgroundWorker that represents a variation on the BackgroundWorker design pattern Listing 13-2 shows the code Listing 13-2 A Variation on the BackgroundWorker Design Pattern for Iterative Computations open SystemComponentModel open SystemWindowsForms /// An IterativeBackgroudWorker follows the BackgroundWorker design pattern /// but instead of running an arbitrary computation it iterates a function /// a fixed number of times and reports intermediate and final results.

The simplest type of rule method is one that doesn t require any information beyond that provided by the basic RuleArgs parameter. For instance, the StringRequired() rule method only needs a reference to the object containing the value and the name of the property to be validated: public static bool StringRequired(object target, RuleArgs e) { string value = (string)Utilities.CallByName( target, e.PropertyName, CallType.Get); if (string.IsNullOrEmpty(value)) { e.Description = e.PropertyName + " required"; return false; } return true; }

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A CallByName() helper method is used to abstract the use of reflection to retrieve the property value based on the property name. It simply uses reflection to get a PropertyInfo object for the specified property, and then uses it to retrieve the property value. If the property value is null or is an empty string, then the rule is violated, so the Description property of the RuleArgs object is set to describe the nature of the rule. Then false is returned from the rule method to indicate that the rule is broken. Otherwise, the rule method simply returns true to indicate that that rule is not broken. This rule is used within a business object by associating it with a property. A business object does this by overriding the AddBusinessRules() method defined by BusinessBase. Such code would look like this (assuming a using statement for Csla.Validation): [Serializable()] public class Customer : BusinessBase<Customer> { protected override void AddBusinessRules() { ValidationRules.AddRule( new RuleHandler(CommonRules.StringRequired), "Name"); } // rest of class } This associates the rule method with the Name property so that the PropertyHasChanged() call within the property s set block will automatically invoke the rule. You ll see this and other rule methods used in 8 within the sample application s business objects.

As you know, every element in a document is an object. Each element has DOM properties like nodeName, nodeType, and so on. Some elements have even more properties than those provided by the DOM Core. Every form element in a document is an object of the type Form. Each Form object has a property called elements.length. This value returns the number of form elements contained by a form:

/// The worker is paramaterized by its internal state type /// /// Percentage progress is based on the iteration number Cancellation checks /// are made at each iteration Implemented via an internal BackgroundWorker type IterativeBackgroundWorker<'a>(oneStep:('a -> 'a), initialState:'a, numIterations:int) = let worker = new BackgroundWorker(WorkerReportsProgress=true, WorkerSupportsCancellation=true).

A slightly more complex variation is where the rule method needs extra information beyond that provided by the basic RuleArgs parameter. In these cases, the RuleArgs class must be subclassed to create a new object that adds the extra information. A rule method to enforce a maximum length on a string, for instance, requires the maximum length value.

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