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a. Turn off features such as the Location service if you do not require them, or turn them off as soon as possible after using them. b. Use single-letter names for variables in your code. c. Optimize your code using good coding practice and simplifications where appropriate. d. Make full use of the Graphics Processing Unit (GPU) by avoiding code that cannot run on it. Answer: Only a , c , and d are valid ways to maximize performance of Windows Phone 7 applications. All .NET Framework source code is compiled to Microsoft intermediate language (MSIL) code that does not include the variable names. Applications must be compiled in Release mode for distribution and will not contain debugging symbols.
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1. Which of the following are good reasons to use the MVVM pattern for your Windows Phone 7 application a. It improves the testability of your application. True. This is a valid reason for using the MVVM pattern. b. It facilitates porting the application to another platform, such as the desktop. False. The view and view model are often tightly coupled and use features of the Windows Phone 7 platform, making these elements difficult to port. c. It helps to make it possible for designers and developers to work in parallel. True. Designers can work on the XAML files that make up the view independently of the developers working on the code in the view models. d. It may help you to avoid risky changes to existing model classes. True. Sometimes you may have existing model objects that encapsulate complex domain logic that you don t want to change. In this case, the view model acts as an adaptor, exposing the model to the view. For more information, see the section, Benefits of MVVM, in 4.
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2. Which of the following are good reasons to not use the MVVM pattern for your Windows Phone 7 application a. You have a very tight deadline to release the application. True. The MVVM pattern tends to add complexity to the application, especially during the initial development. However, you should carefully evaluate the long-term benefits of using the MVVM pattern. b. Your application is relatively simple with only two screens and no complex logic to implement. True. Such a simple application may not warrant the overheads of implementing the MVVM pattern. c. Windows Phone 7 controls are not ideally suited to the MVVM pattern. False. The Windows Phone 7 controls support binding in the same was as standard Silverlight controls. In some cases though, you may have to develop custom behaviors to get specific functionality. d. It s unlikely that your application will be used for more than six months before it is completely replaced. True. One of the advantages of the MVVM pattern is improved maintainability. For an application with a short shelf life, in may not be worth the overheads to the development process associated with the MVVM pattern. For more information, see the section, Benefits of MVVM, in 4. 3. Which of the following differentiate Pivot and Panorama controls a. The Pivot control enables navigation in two dimensions; the Panorama control only supports navigation in a single dimension. False. Both controls use horizontal navigation. b. The Panorama control provides a large canvas that extends beyond the confines of the screen. The Pivot control allows the user to navigate between different views. True. These describe core usage scenarios for the two controls.
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c. The Pivot control is ideally suited to displaying filtered lists. True. This is how Tailspin uses the Pivot control. d. The Panorama control is ideally suited to displaying media items. False. Although the Panorama control can display media items as the TakeSurveyView page in the Tailspin application illustrates, there s nothing to stop you from displaying media items on a PivotItem on a Pivot control. For more information, see the section, User Interface Elements, in 4. 4. Which of the following describe the role of the view model locator a. The view model locator configures bindings in the MVVM pattern. False. Although the view model locator establishes the link between a view and a view model, the bindings are configured in the view s XAML code. b. In the Tailspin mobile client, the view model locator is responsible for instantiating view model objects. False. In the Tailspin application, the dependency injection container instantiates the view model objects and manages their lifetimes. c. The view model locator hooks up views to view models. True. This is the core functionality of the view model locator. d. Data template relations offer an alternative approach to a view model locator. True. This is an alternative way to connect views to view models. For more information, see the section, Connecting the View and the View Model, in 4. 5. Where does the Back button take you a. To the previous view in the navigation stack. True. This is what happens within your application. b. It depends on what the code in the view model does. False. The behavior of the hardware Back button is determined by the operating system.
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c. If the current view is the last one in the navigation stack, you leave the application. True. This returns you to the phone s Start screen. d. If your application is on the top of the phone s application stack, it takes you back to your application. True. You can use the Back button to navigate back to your application from the phone s environment. For more information, see the section, Navigation, in 4. 6. Why should you not use code-behind when you re using the MVVM pattern a. The view model locator always intercepts the events, so code-behind code never executes. False. The view model locator does not intercept control events. b. The MVVM pattern enforces a separation of responsibilities between the view and the view model. UI logic belongs in the view model. True. This is the separation of responsibilities between the view and the view model. c. If you are using the MVVM pattern, other developers will expect to see your code in the view model classes and not in the code-behind. True. This is the expected place for UI logic. d. Code-behind has a negative effect on view performance. False. Whether code is in code-behind files or in view model classes has no effect on the application s performance. For more information, see the section, Using the ModelView-View Model, in 4.
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