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/// <summary>
/// The blogger repository implementation which works the same for Windows
/// and Windows Phone.
/// </summary>
public class BloggerRepository : IBloggerRepository
{
    private UserCredential credential;
    private BloggerService service;

    private async Task AuthenticateAsync()

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/// <summary>The blogs view model which contains all blog data.</summary>
public class BlogsViewModel : ViewModelBase
{
    /// <summary>Gets the blog view models..</summary>
    public ObservableCollection<BlogViewModel> Blogs { get; private set; }

    private BlogViewModel selectedBlog;

    /// <summary>Gets or sets the selected blog.</summary>
    public BlogViewModel SelectedBlog

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/// <summary>
/// Continues the app after retrieving the authorization code.
/// 
/// First it stores the authorization code result in the data store.
/// Then it calls the view model get blogs method, in order to retrieve all blogs.
/// The view model is responsible to check for if the authorization code exists in
/// the data store, and then, continue with the regular flow.
/// After retrieving all blogs, this method deletes the authorization code so it
/// won't be used in a next run.
/// </summary>

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/// <summary>
/// On activated callback. It is used in order to continue the application
/// after the user authenticated.
/// </summary>
protected override void OnActivated(IActivatedEventArgs e)
{
    base.OnActivated(e);
 
    ContinuationManager = new Blogger.Common.ContinuationManager();
    var continuationEventArgs = e as IContinuationActivatedEventArgs;

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/// <summary>
/// ContinuationManager is used to detect if the most recent activation was due to a
/// authentication continuation.
///
/// Note: To keep this sample as simple as possible, the content of the file was changed
/// to support WebAuthenticationBrokerContinuation ONLY. Take a look in
/// http://msdn.microsoft.com/en-us/library/dn631755.aspx for a full documentation on how
/// to support continuation in other cases.
/// </summary> 
public class ContinuationManager

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UserCredential credential;
using (var stream = new FileStream("client_secrets.json",
                                   FileMode.Open,
                                   FileAccess.Read))
{
    credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
        GoogleClientSecrets.Load(stream).Secrets,
        new[] { BooksService.Scope.Books },
        "user", CancellationToken.None);
}