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The code first checks the value of an element in the view dictionary and then decides which partial view to render. This code, in particular, doesn t look bad and still relies only on provided data. However, it attributes some extra power to the view object. The view contains some logic deciding about the partial view to render that is not about the physical rendering of the view, such as a foreach statement. You should consider whether the decision about the partial view really belongs to the view. In general, it s preferable to move any logic up to the controller. The controller method that invokes the previous view, then, looks like this:

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Using Dynamic Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

Routing IP Multicast Traffic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

Adjectives Describe Nouns You can think of objects as nouns and properties as adjectives, that is, the red flower or the six-foot-tall person. This concept isn t perfect because some attributes are relatively specific, such as the truck with 55,230 miles, but this idea might be helpful as you begin working with objects.

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Practice: Installing RIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

Methods are actions that are performed by the object. For example, a report object might include a print method that sends the report to a printer. Another way of thinking about methods is that methods describe the operations performed with the information contained in the properties of the object. Tip

public ActionResult s(int chapterID) { // Deal with input parameters int id = 0; if (chapterID.HasValue) id = chapterID.Value; // Perform any task, and acquire any data IContentServices service = ...; // Render the entire TOC if (id == 0) { IList<> chapters chapters = service.Loads(); return View("TOC", new TocViewModel(chapters)); } // Render details about a single chapter chapter = service.Load(id); return View("Single", new ViewModel(chapter)); }

Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23

Verbs Describe Actions You can characterize methods as a verb that performs an operation or a task with the properties in the object.

Lesson Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Lesson 3: Securing Remote Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

Although not strictly a part of the object programming model, events are a useful tool that allow an object to communicate information with the program that created the object. Simply put, an event is a subroutine residing in the program that created the object that s called by the object, which is called from within the object. An event is a useful technique that obviates the need for a program to constantly monitor an object for changes. Instead, the object calls the event to inform the calling program of a change in the object s state.

The net effect is that you now have two simpler views with a minimum amount of logic. If you have reasons to maintain partial views, you can use a view as simple as the one shown here:

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