By Raffaele Garofalo

Simplify and enhance enterprise software improvement through using the MVVM trend to home windows Presentation starting place (WPF) and Microsoft Silverlight four. With this hands-on consultant, you are going to use MVVM with info binding, instructions, and behaviors to create person interfaces loosely coupled to company good judgment. MVVM is perfect for .NET builders operating with WPF and Silverlight - even if you may have adventure construction company functions.

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Extra info for Building Enterprise Applications with Windows Presentation Foundation and the Model View ViewModel Pattern

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Typically, a LOB application will have a UI layer, the layer that composes the graphic interface; a Domain Layer, the layer that represents business entities (such as a Customer, an Order, and so on); a Business Layer, which is in charge of encapsulating all the business logic of the application; and a Data Access Layer, the layer in charge of persisting and retrieving data. All programming paradigms aid developers in the process of improving SoC. For example, object-oriented programming languages such as Delphi, C++, Java, and C# separate concerns into objects; a design pattern such as MVC can separate content from presentation, and data-processing (model) from content.

Figure 2-3 shows the final result as it might appear in a browser. NET MVC. info 34 Chapter 2 Design Patterns Pros and Cons of the MVC Pattern The MVC pattern fits web applications best. Its strengths are its capacity to display the same Model in different Views and the ability to change the way the View renders without affecting the Model (which is unaware of the Views). Another strength is its testability. Because the View is also unaware of the Model, the Controller can simply use a mockup Model for testing purposes.

N The Controller is the orchestrator of this pattern; it is in charge of intercepting user input (mouse and keyboard) and interacting with the Model and/or the View. Figure 2-1 shows the structure of a basic MVC design. This design is also called the Passive MVC pattern, and it’s the default implementation. Controller Model View Figure 2-1 A Passive MVC pattern. The most important point of this implementation is that the Model is aware of neither the View nor the Controller. The Model remains agnostic, so you can develop and test it in a separate context.

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