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Essentials of Developing Windows Store Apps using C#

Question No: 11 – (Topic 1)

You need to ensure that only the correct information is preserved when the user switches to another app.

Which actions should you perform? (Each correct answer presents part of the solution. Choose all that apply.)

  1. Save photographs by calling the SaveDataToAzureStorage() method.

  2. Save application state by calling the SaveDataToLocalStorage() method.

  3. Save application state by calling the SaveDataToRoamingStorage() method,

  4. Save photographs by calling the SaveDataToWebService() method.

  5. Save application state by calling the SaveDataToAzureStorage() method.

  6. Save photographs by calling the SaveDataToLocalStorage() method.

Answer: B,F

Question No: 12 – (Topic 1)

You need to ensure that launching the app displays the required information.

From which ApplicationExecutionState enumeration should you configure the user interface state?

  1. ClosedByUser

  2. Suspended

  3. NotRunning

  4. Running

  5. Terminated

Answer: E

Explanation: The user closes the app through the close gesture or Alt F4 and takes longer than 10 seconds to activate the app again.

*From scenario: 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.

Your app can use activation to restore previously saved data in the event that the operating system terminates your app, and subsequently the user re-launches it. The OS may terminate your app after it has been suspended for a number of reasons. The user may manually close your app, or sign out, or the system may be running low on resources.

Ref: http://msdn.microsoft.com/en-us/library/windows/apps/hh464925.aspx

Question No: 13 DRAG DROP – (Topic 1)

You need to update the app tile images.

With which four code segments in sequence should you replace line AX23? (To answer, move 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:

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Explanation: Box 1:

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Box 2:

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Box 3:

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Box 4:

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Note:

  • From scenario:

    / Regularly update the app tile with random images from the user#39;s collection displayed one at a time.

  • What is the difference between ms-appx:/// and ms-appdata:///

    The bird#39;s eye view is that ms-appx is your app package (where the app is installed), and ms-appdata is your application data .

    Topic 2, Scenario 2 Background

    You are developing a Windows Store app named Picture Sharer. The app will allow users to capture, modify, caption, and share pictures.

    Application Structure

    The ShareImageButton and GetContactsButton controls use the same foreground color. The foreground color might change in the future.

    The following code defines a custom button style named ButtonStyleRed:

    lt;StyleTargetType=quot;Buttonquot; quot;x:Key=quot;ButtonStyleRedquot;gt;

    lt;SetterProperty=quot;Foregroundquot; Value=quot;#FFC34343quot;/gt;

    lt;SetterProperty=quot;BorderBrushquot; Value=quot;#FFC34343quot;/gt;

    lt;/Stylegt;

    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 meet the following business requirements:

    ->Allow users to capture and retrieve pictures, modify pictures by adding a shading effect, and add captions to images.

    ->Support only Landscape and Landscape-flipped orientations.

    ->Ensure that users can select and modify images from the PictureChooserPaqe page.

    ->Ensure that users can change the magnification of the selected image and resize the image by using pinch and stretch gestures. Scaling should be fluid and precisely controlled by the user.

    The app must be localized for the French Canadian market.

    Technical Requirements

    The app must meet the following technical requirements:

    ->Scroll bars must not be visible.

    ->The CaptionTextBlock and CaptionTextBox controls must appear side by side, without overlapping and on the same line. The CaptionTextBox control should appear to the right of the CaptionTextBlock control.

    ->The ContactPicker object must be filtered to display only email addresses.

    ->Minimize the code that is required to implement optical zoom functionality.

    You must perform the following tasks:

    ->Handle the Click event of the GetPictureButton control to switch from the current page to the PictureChooserPage page.

    ->After the user selects an image on the PictureChooserPage page, ensure that the app navigates back to the PictureSharerMainPage page.

    ->Track the current screen orientation and page size by updating the

    _currentViewState, _currentHeight, and _currentWidth fields every time the screen orientation or page size changes.

    ->Create a style named ButtonStyleWhite that inherits all the style settings of the

    ButtonStyleRed style except the border color; the border color must be white. The ButtonStyleWhite style must automatically update with any changes that are made to the ButtonStyleRed style.

    ->Create a resource named ButtonForegroundColor to implement the button

    foreground color so that it can be referenced in XAML by using the following

    standard syntax: Foreground-quot;{StaticResourceButtonForegroundColor}quot;

    ->Ensure that the OnNavigatedTo() method updates the current picture when a new picture is selected.

    ->Change the background for the root Grid element to a vertical gradient that transitions from black at the top to maroon at the bottom. Create a resource named GridBackgroundGradientBrush to hold the requested gradient.

    ->While testing the app, you observe the following results:

    ->An exception is being thrown in the GetContactsCompleted event handler when the retrieved email address is assigned to the RecipientsTextBlock control. The exception message states: quot;The application called an interface that was marshalled for a different thread.quot;

    ->When users navigate away from the PictureSharerMainPage page, information

    that was entered in the CaptionTextBox control is lost.

    PictureSharerMainPage.xaml

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    Ensurepass 2018 PDF and VCE

    Question No: 14 – (Topic 2)

    You need to implement the required image magnification and manipulation requirements for selected images.

    Which actions should you perform? (Each correct answer presents part of the solution. Choose all that apply.)

    1. Use the ManipulationDeltaRoutedEventArgs.Delta.Expansion value to implement optical zoom.

    2. Add a ManipulationMode attribute to the Selectedlmage object and set the attribute to Translate.

    3. Use the ManipulationDeltaRoutedEventArgs.Delta.Scale value to implement optical zoom.

    4. Add a ManipulationDelta event to the SelectedImage object.

    5. Add a ManipulationMode attribute to the SelectedImage object and set the attribute to All.

    6. Add a ManipulationComplete event to the SelectedImage object.

    Answer: C,D,E Explanation:

  • From scenario:

Ensure that users can change the magnification of the selected image and resize the image by using pinch and stretch gestures. Scaling should be fluid and precisely controlled by the user.

Question No: 15 – (Topic 2)

You need to retain the data that is entered in the TextBox control when the user navigates away from the PictureSharerMainPage page.

Which code segment should you insert at line CS08?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: B

Explanation: * NavigationCacheMode

Specifies caching characteristics for a page involved in a navigation.

  • NavigationCacheMode.Required

    The page is cached and the cached instance is reused for every visit regardless of the cache size for the frame.

    Question No: 16 – (Topic 2)

    You need to localize the Picture Sharer app in the required language.

    Which actions should you perform? (Each correct answer presents part of the solution. Choose all that apply.)

    1. Add a Uid attribute to any XAML elements that must be localized.

    2. Create a folder named fr-CA at the root of the project.

    3. Create a resource file named resources.res.

    4. Create a resource file named resources.resw.

    5. Create a folder named es-ES at the root of the project.

    6. Add a Name attribute to any XAML elements that must be localized.

    Answer: A,B,D

    Explanation: * (A) To localize a certain property of a XAML element you only need to add a x:Uid=quot;SomeKeyquot; attribute to the element and add the appropriate resource to the .resw file.

  • (B) The app must be localized for the French Canadian market.

  • (BD) Example: A French language resource named quot;Greetingquot; whose value is quot; Bonjour!quot;. To create the resource file, add a folder named fr-FR to your project, and then add a resource file named Resources.resw to the folder.

  • In Windows Store apps, you designate the names of localized resource files by creating a folder to store the resources and images of a supported culture. You can then describe the resource by using the culture name (such as quot;ko-krquot;) followed by the default resource name and resource file extension (such as quot;ko-kr\Resources.reswquot;).

    URL: http://msdn.microsoft.com/en-us/library/windows/apps/hh694557(v=vs.110).aspx

    Question No: 17 – (Topic 2)

    You need to retain the data that is entered in the TextBox control when the user navigates away from the PictureSharerMainPage page.

    Which code segment should you insert at line CS08?

    1. this.NavigationCacheMode

      =Windows.UI.Xaml.Navigation.NavigationCacheMode.Required;

    2. this.NavigationCacheMode = Windows.UI.Xaml-Navigation.NavigationCache.Enabled;

    3. this.CaptionTextbox.CacheMode = Windows.UI.Xaml.ControlCache.CacheEnabled;

    4. var cache = CaptionTextBox.Text;

    Answer: A

    Explanation: * To enable a page to be cached, set NavigationCacheMode to either Enabled or Required. The difference in behavior is that Enabled might not be cached if the frame#39;s cache size limit (CacheSize) is exceeded, whereas Required always generates an entry no matter the size limit.

  • Scenario: After the user selects an image on the PictureChooserPage page, ensure that the app navigates back to the PictureSharerMainPage page.

Question No: 18 DRAG DROP – (Topic 2)

You need to refactor the code so that more than one contact can be selected by using the ContactPicker class.

You have the following code:

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Which code snippets should you insert in Target 1, Target 2, and Target 3 to complete the code? (To answer, drag the appropriate code snippets to the correct targets in the answer area. Each code snippet may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

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Answer:

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Explanation:

C:\Users\Kamran\Desktop\image.jpg Note:

PickMultipleContactsAsync

Launches the Contact Picker for selecting multiple contacts. Return value

Type: IAsyncOperationlt;IVectorViewgt;

Incorrect:

  • ContactPicker.PickContactAsync, pickContactAsync method Launches the Contact Picker to select a single contact.

    Question No: 19 – (Topic 2)

    You need to create the ButtonForegroundColor resource.

    Which code segment should you insert at line XA09?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: A

    Explanation: * Create a resource named ButtonForegroundColor to implement the button foreground color so that it can be referenced in XAML by using the following standard syntax: Foreground-quot;{StaticResourceButtonForegroundColor}quot;

  • SolidColorBrush

Question No: 20 – (Topic 2)

You need to modify the GetContactsCompleted event handler to prevent the exception. Which code segment should you use to replace line CS32?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: D

Explanation: * An exception is being thrown in the GetContactsCompleted event handler when the retrieved email address is assigned to the RecipientsTextBlock control. The exception message states: quot;The application called an interface that was marshalled for a different thread.quot;

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