/// <summary>
/// Preserves state associated with this page in case the application is suspended or the
/// page is discarded from the navigation cache. Values must conform to the serialization
/// requirements of <see cref="SuspensionManager.SessionState"/>.
/// </summary>
/// <param name="sender">The source of the event; typically <see cref="NavigationHelper"/></param>
/// <param name="e">Event data that provides an empty dictionary to be populated with
/// serializable state.</param>
protected override async void navigationHelper_SaveState(object sender, SaveStateEventArgs e)
{
if (this.subscription != null)
{
await App.Current.Client.Unsubscribe(this.subscription);
this.subscription = null;
}
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
protected override async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
var postId = e.NavigationParameter as String;
this.subscription = await App.Current.Client.Subscribe("singlePost", postId);
var post = App.Current.Client.GetCollection<Post>("posts").Single(x => x.Id == postId);
this.viewModel = new PostViewModel() {Title = post.Title, Url = post.Url};
this.DataContext = this.viewModel;
this.postToEdit = post;
}
private async Task LoadData()
{
var newSubscription = await App.Current.Client.Subscribe("posts", new SubscribeParamters { Limit = this.limit, Sort = this.sort });
if (this.currentSubscription != null)
{
await App.Current.Client.Unsubscribe(this.currentSubscription);
}
this.currentSubscription = newSubscription;
this.viewModel.ShowLoadMore = this.viewModel.Posts.Count >= this.limit;
}
