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Microsoft 70-484 Essentials of Developing Windows Store Apps using C#
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Case Study: 1 Scenario 1 Background You are developing a Windows Store app by using C# and XAML. The app will allow users to share and rate photos. The app will also provide information to users about photo competitions. Application Structure The app stores data by using a class that is derived from the DataStoreBase class. The app coordinates content between users by making calls to a centralized RESTful web service. The app has a reminder system that displays toast notifications when a photo competition is almost over. The app gets the competition schedule data from the web service. The app displays a list of images that are available for viewing in a data-bound list box. The image file list stores paths to the image files. The app downloads new images from the web service on a regular basis. Relevant portions of the app files are shown. (Line numbers are included for reference only and include a two-character prefix that denotes the specific file to which they belong.) Business Requirements The app must allow users to do the following: • Run the app on a variety of devices, including devices that have limited bandwidth connections. • Share and synchronize high resolution photographs that are greater than 1 MB in size. • Rate each photo on a scale from 1 through 5. Technical Requirements The app must meet the following technical requirements: • Retain state for each user and each device. • Restore previously saved state each time the app is launched. • Preserve user state and photo edits when switching between this app and other apps. • When the app resumes after a period of suspension, refresh the user interface, tile images, and data with current information from the web service. • Update the image list box as new images are added to the image file list. • Convert the image paths into images when binding the image file list to the list box. The app must store cached images on the device only, and must display images or notifications on the app tile to meet the following requirements: • Regularly update the app tile with random images from the user's collection displayed one at a time. • When a photo is displayed on the tile, one of the following badges must be displayed: • If the photo has a user rating, the tile must display the average user rating as a badge. • If the photo does not have a rating, the tile must display the Unavailable glyph as a badge.
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• Update the app tile in real time when the app receives a notification. • Display only the most recent notification on the app tile. The app must display toast notifications to signal the end of a photo competition. The toast notifications must meet the following requirements: • Display toast notifications based on the schedule that is received from the web service. • Display toast notifications for as long as possible. • Display toast notifications regardless of whether the app is running. • When a user clicks a toast notification that indicates the end of the photo competition, the app must display the details of the photo competition that triggered the toast notification.
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Question: 1 You need to ensure that launching the app displays the required informaton. From which ApplicatonnEecutonotate enumeraton should you confgure the user interface state? A. ClosedByUser B. ouspended C. NotRunning D. Running n. Terminated
Answer: A nEplanatonn * ClosedByUser The user closes the app through the close gesture or Alt+F4 and takes longer than 10 seconds to actiate the app again. *From scenarion The app must meet the following technical requirementsn Retain state for each user and each deiice. Restore preiiously saied state each tme the app is launched.
Question: 2 You need to choose the appropriate data binding strategy for the image list boE. Which method should you use? A. oystem.Drawing.ImageConierter.ConiertTootring() B. IValueConierter.ConiertBack() C. IValueConierter.Coniert() D. oystem.Drawing. ImageConierter-ConiertFromotrin()
Answer: C
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nEplanatonn IValueConierter.Coniert The data binding engine calls this method when it propagates a ialue from the binding source to the binding target.
Question: 3 You need to confgure toast notfcatons for the photo competton. Which code segment should you use?
A. Opton A B. Opton B C. Opton C D. Opton D
Answer: B nEplanatonn The app must display toast notfcatons to signal the end of a photo competton. The toast notfcatons must meet the following requirementsn / Display toast notfcatons for as long as possible
Question: 4 You need to ensure that only the correct informaton is preseried when the user switches to another app. Which actons should you perform? (nach correct answer presents part of the soluton. Choose all that apply.) A. oaie applicaton state by calling the oaieDataToRoamingotorage() method, B. oaie photographs by calling the oaieDataToLocalotorage() method. C. oaie photographs by calling the oaieDataToWeboeriice() method. D. saie applicaton state by calling the oaieDataToLocalotorage() method.
Answer: A, B nEplanatonn An From scenarion The app must meet the following technical requirementsn
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Retain state for each user and each deiice. Bn From scenarion The app must store cached images on the deiice only
Question: 5 You need to ensure that the app resumes according to the requirements. Which actons should you perform? (nach correct answer presents part of the soluton. Choose all that apply.) A. Retrieie new user content by using the Window.Current.Dispatcher.Processnients() method in the App_Resuming eient handler. B. update the user interface by using the Window.Current.Dispatcher.Inioke() method in the App_Resuming eient handler. C. Oierride the OnLaunched eient handler. D. Retrieie new user content by using the Window.Current.Dispatcher.Processnients() method in the OnLaunched eient handler when the Actiatonoind is Launch. n. Update the user interface by using the Window.Current.Dispatcher.Inioke() method in the OnLaunched eient handler when the Actiatonoind is Launch. F. Register the App_Resuming eient handler for theResuming eient.
Answer: A, B nEplanatonn From scenarion The app must meet the following technical requirementsn / When the app resumes afer a period of suspension, refresh the user interface, tle images, and data with current informaton from the web seriice.
Question: 6 You need to choose the appropriate data binding strategy for the image list boE. Which method should you use? A. oystem.Drawing.ImageConierter.ConiertTo(ialue, typeof(Image)) B. IValueConierter.Coniert() C. oystem.Drawing.ImageConierter.ConiertFrom(ialue, Culturelnfo.CurrentUICulture) D. IValueConierter.ConiertBacfc ()
typeof(Image),
Answer: B nEplanatonn IValueConierter.Coniert The data binding engine calls this method when it propagates a ialue from the binding source to the binding target.
Question: 7 A photo competton is ending. You need to meet the requirements when a user clicks the toast notfcaton.
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Which code segment should you use?
A. Opton A B. Opton B C. Opton C D. Opton D
Answer: D nEplanatonn From scenarion When a user clicks a toast notfcaton that indicates the end of the photo competton, the app must display the details of the photo competton that triggered the toast notfcaton.
Question: 8 DRAG DROP You need to update the app tle images. With which four code segments in sequence should you replace line AX23? (To answer, moie the appropriate code segments from the list of code segments to the answer area and arrange them in the correct order.)
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Answer: BoE 1n
BoE 2n
BoE 3n
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BoE 4n
nEplanatonn Noten * From scenarion / Regularly update the app tle with random images from the user's collecton displayed one at a tme. * What is the diference between ms-appEn/// and ms-appdatan/// The bird's eye iiew is that ms-appE is your app package (where the app is installed), and ms-appdata is your applicaton data .
Question: 9 You need to identfy the class to use as the data conteEt for the image list boE. Which class should you use? A. oystem. Collectons. Object Model. CollectonObserierrTT B. oystem.Collectons.ObjectModel.ObseriableCollectonrTT C. oystem.Collectons.Generic.InnumeratorrTT D. oystem.Collectons.Generic.InnumerablerTT
Answer: B nEplanatonn ObseriableCollectonrTT Class Represents a dynamic data collecton that proiides notfcatons when items get added, remoied, or when the whole list is refreshed.
Question: 10 You need to correctly display notfcatons on the app tle. Which code segments should you insert at line AX24? (nach correct answer presents part of the soluton. Choose all that apply.)
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A. Opton A B. Opton B C. Opton C D. Opton D
Answer: B, D nEplanatonn Bn TileUpdater.nnableNotfcatoniueue | enableNotfcatoniueue method nnables the tle to queue up to fie notfcatons. This enables the notfcaton queue on all tle sizes. Dn From scenarion Display toast notfcatons based on the schedule that is receiied from the web seriice.
Question: 11 You need to ensure that resuming the app displays the required informaton. From which ApplicatonnEecutonotate enumeraton should you confgure the user interface state? A. Terminated B. NotRuntinq C. ouspended D. Running n. ClosedByUser
Answer: E nEplanatonn * ClosedByUser The user closes the app through the close gesture or Alt+F4 and takes longer than 10 seconds to actiate the app again. *From scenarion The app must meet the following technical requirementsn Retain state for each user and each deiice. Restore preiiously saied state each tme the app is launched.
Question: 12 You need to ensure that only the correct informaton is preseried when the user switches to another app. Which actons should you perform? (nach correct answer presents part of the soluton. Choose all that apply.) A. oaie photographs by calling the oaieDataToAzureotorage() method. B. oaie applicaton state by calling the oaieDataToLocalotoragei method. C. oaie applicaton state by calling the oaieDataToRoamingotorage() method, D. oaie photographs by calling the oaieDataToWeboeriice() method. n. oaie applicaton state by calling the oaieDataToAzureotorage() method. F. oaie photographs by calling the oaieDataToLocalotorage() method.
Answer: EF
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nEplanatonn Cn The app must meet the following technical requirementsn • Retain state for each user and each deiice. • Restore preiiously saied state each tme the app is launched. Fn The app must store cached images on the deiice only
Question: 13 You need to access the remote image data according to the requirements. Which data storage methods should you use? A. oaieDataTooqlAzureotorage() and GetDataFromoqlAzureotorage() B. oaieDataToRemoteotorage() and GetDataFromRemoteotorage() C. oaieDataToAzureotorage() and GetDataFromAzureotorage() D. oaieDataToWeboeriice() and GetDataFromWeboeriice()
Answer: C
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