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To provide good performance in managing the list of rules for each property, ValidationRules uses an optimal data structure. Specifically, it has a dictionary with an entry for each property. Each entry in the dictionary contains a list of the rules for that property. This provides for very fast lookup to get the list of rules for a specific property, since the dictionary can jump right to the property s entry. The dictionary is strongly typed, keyed by the property name, and used for storing strongly typed lists of RuleMethod objects: [NonSerialized()] private Dictionary<string, List<RuleMethod>> _rulesList; The business developer calls an AddRule() method to associate a rule method with a property on the business object. There are two versions of this method, the simplest accepting just a rule method delegate and the name of the property: public void AddRule(RuleHandler handler, string propertyName) { // get the list of rules for the property List<RuleMethod> list = GetRulesForProperty(propertyName); // we have the list, add our new rule list.Add(new RuleMethod(_target, handler, propertyName)); }

The GetRulesForProperty() method returns the list of RuleMethod objects associated with the property. If such a list doesn t already exist, it creates an empty list and adds it to the dictionary. This is another example of lazy object creation. If there are no rules for a property, no list object is ever added to the dictionary, thus reducing the overhead of the whole process. In fact, the dictionary object itself is created on demand as well, so if no business rules are ever associated with properties for an object, even that little bit of overhead is avoided. The other AddRule() implementation provides an increased level of control. Its method signature is as follows: public void AddRule(RuleHandler handler, RuleArgs args) This overload allows the business developer to provide a specific RuleArgs object that will be passed to the rule method when it is invoked. This is required for any rule methods that require custom RuleArgs subclasses, so it will be used any time extra information needs to be passed to the rule method. The combination of the RuleMethod class, the dictionary and list object combination, and the AddRule() methods covers the management of the rules associated with each property.

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Windows are allowed to draw in their own client area, and the drawing is performed through the device context, an object provided by the graphical system and used to perform the graphic primitives to draw the content The graphic primitives issued to the graphics system are not retained by it; therefore, when the window is covered for some reason, the portion that becomes hidden must be repainted once uncovered Since the information required to redraw the hidden portion is held by the application owning the window, the graphical system sends a paint message to the window To better understand the drawing model, consider a simple graphical application that shows how to draw a curved line using the B zier curve and canonical splines, given four control points.

</head> <body> <script> document.write("<p>This is inserted.</p>"); </script> </body> </html> If you load test.html in a web browser, you will see a paragraph of text that reads This is inserted.

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