By Christine Hooghe
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ToString() method implementation. In the standard RuleArgs class, only the property name is returned. arg1=value&arg2=value If this is not done, then the resulting text value will not be a properly formatted URI value. Page 35 It should now be clear how a business object can call the GetRuleDescriptions() method to retrieve an array of URI-formatted text values, each entry representing a rule that has been associated with a property of the business object. ToArray The BrokenRulesCollection includes a ToString() override, which returns the humanreadable descriptions of the broken rules for the object as a single text value.
ToArray(); } This code loops through all the properties in the object that have rules, and then loops through the rules associated with each property. Notice the use of the RulesToCheck() helper method, which returns the consolidated list of per-type and per-instance rules for this particular business object. This method was discussed earlier in the book. The real work occurs in the RuleMethod and RuleArgs classes, which are responsible for generating the URI text representation. Changes to RuleMethod Both the generic and non-generic RuleMethod classes maintain a _ruleName field, which stores the text representation of the rule.
Per-type rules are far more efficient in their use of memory, and offer performance benefits because the association of rules to properties only occurs once per AppDomain rather than as each object is created. Typically, this means the association occurs once during the lifetime of the application. Per-instance rules provide more flexibility, because these rules are associated with the object’s properties as each object is created. You can write code to change the way the rules are associated with the object based on the specific object being created.