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Vendor: Microsoft
Exam Code: 70-484
Exam Name: Microsoft Essentials of Developing Windows Store Apps using C#

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QUESTION 21
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?

A.    this.NavigationCacheMode
=Windows.PI.Xantl.Navigation.NavigationCacheMode.Required;
B.    this.NavigationCacheMode = Windows.01.Xaml-Navigation.NavigationCache.Enabled;
C.    thls.Caption~ext3ox.CacheMode = Windows.01.Xaml.ControlCache.CacheEnabled;
D.    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’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 22
You need to create the ButtonForegroundColor resource.
Which code segment should you insert at line XA09?
 

A.    Option A
B.    Option B
C.    Option C
D.    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-“{StaticResourceButtonForegroundColor}”
– SolidColorBrush

QUESTION 23
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:
 
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.)
 
Answer:
 
Explanation:
PickMultipleContactsAsync
Launches the Contact Picker for selecting multiple contacts.
Return value
Type: IAsyncOperation<IVectorView>
Incorrect:
– ContactPicker.PickContactAsync, pickContactAsync method Launches the Contact Picker to select a single contact.

Case Study: 3 – Scenario 3 (QUESTION 24 – QUESTION 34)
Background
You are developing a Windows Store news aggregator app that will retrieve data from RSS feeds and social networks based on the user’s subscriptions.
Application Structure
The app will run locally on the user’s device. User preferences will be available locally.
When a user starts the app, the app will load the RSS feed and social network information.
The app will retrieve data from RSS feeds by using the FeedRetriever class.
The app will authenticate to and retrieve data from social networks by using the SocialRetriever class.
By default, data is presented in a ListView control.
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.)
Technical Background
The design team has provided a custom XAML code segment for the itemTemplate attribute of the GridView control that displays RSS feeds. The custom item template is named newTem plate. It will not be used in other GridView controls.
Requirements
Business Requirements
The app must enable users to perform the following tasks:
– Define a feed title.
– Define a list of RSS feeds that the users want to subscribe to.
– View information about topics that are popular on the users’ selected social networks.
– Share content that is aggregated by the app.
– Search aggregated content by using only the Search charm.
– Share RSS feed content by using the Share charm.
– Display general help information by using the Settings charm.
The app must list the name of each social network to which the user subscribes.
The app must indicate whether the user is authenticated to that social networking site.
The available data sources will be expanded to include JSON data from a third-party social networking site that is hosted by Litware, Inc. An SSL connection to the Litware social network is available.
Technical Requirements
The app has the following technical requirements:
– Retrieve user data from the social network services by using the authentication credentials.
– When making an HTTP request for content, read all content prior to acting on the response.
– When SSL is available, use SSL to retrieve data from social network providers.
The code that is used to retrieve data from RSS feeds must be reusable.
The app must display the information about the user’s social network subscriptions in a layout control.
The app must display authentication screens from the social networking sites when an authentication screen is available.
The custom XAML code that was provided by the design team must be available for all ListView controls in the app.
Data from the FeedRetriever class must be presented in a data control.
Two developers will create the SocialRetriever class, with the following assignments:
– Developerl must update methods for getting data.
– Developed must implement three new methods for exposing data to the user interface.
– All methods must be self-contained and must not affect other methods in the SocialRetriever class.
– Multiple developers must not work in the same file at the same time.
 
 
 
 

QUESTION 24
You need to retrieve data from the third-party social networking site.
Which code segment should you use?
 

A.    Option A
B.    Option B
C.    Option C
D.    Option D

Answer: A
Explanation:
– Scenario: The available data sources will be expanded to include JSON data from a third-party social networking site that is hosted by Litware, Inc.
An SSL connection to the Litware social network is available.
– await GetAsync Example:
// Read response asynchronously as JsonValue and write out top facts for each country
15: JsonArray content = await response.Content.ReadAsAsync<JsonArray>();

QUESTION 25
You need to identify alternative methods of displaying information from the FeedRetriever class.
Which data controls can you use to achieve this goal? (Each correct answer presents a complete solution. Choose all that apply.)

A.    stackPanel
B.    WrapGrid
C.    GridView
D.    FlipView

Answer: AC
Explanation:
– From scenario:
The app will retrieve data from RSS feeds by using the FeedRetriever class.
Data from the FeedRetriever class must be presented in a data control.
By default, data is presented in a ListView control.
The design team has provided a custom XAML code segment for the itemTemplate attribute of the GridView control that displays RSS feeds.
– StackPanel Class
Arranges child elements into a single line that can be oriented horizontally or vertically.
– GridView Class
Displays the values of a data source in a table where each column represents a field and each row represents a record. The GridView control enables you to select, sort, and edit these items.
Incorrect:
– WrapGrid class
Applies to Windows and Windows Phone
Positions child elements sequentially from left to right or top to bottom. When elements ext