/// <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>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
// TODO: Create an appropriate data model for your problem domain to replace the sample data
// var sampleDataGroups = await SampleDataSource.GetGroupsAsync();
this.DefaultViewModel["Items"] = FeedDataSource.GlobalDataSource.Feeds;
if (FeedDataSource.GlobalDataSource.Feeds == null || FeedDataSource.GlobalDataSource.Feeds.Count == 0)
{
await FeedDataSource.GlobalDataSource.GetFeedsAsync();
}
}
/// <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>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
/* var group = await SampleDataSource.GetGroupAsync((String)e.NavigationParameter);
this.DefaultViewModel["Group"] = group;
this.DefaultViewModel["Items"] = group.Items; */
try
{
int groupId = (int)e.NavigationParameter;
this.DefaultViewModel["Group"] = FeedDataSource.GlobalDataSource.Feeds[groupId];
this.DefaultViewModel["Items"] = FeedDataSource.GlobalDataSource.Feeds[groupId].Items;
}
catch (Exception)
{
//do something
}
if (e.PageState == null)
{
this.itemListView.SelectedItem = null;
// When this is a new page, select the first item automatically unless logical page
// navigation is being used (see the logical page navigation #region below.)
if (!this.UsingLogicalPageNavigation() && this.itemsViewSource.View != null)
{
this.itemsViewSource.View.MoveCurrentToFirst();
}
}
else
{
// Restore the previously saved state associated with this page
if (e.PageState.ContainsKey("SelectedItem") && this.itemsViewSource.View != null)
{
var selectedItem = await SampleDataSource.GetItemAsync((String)e.PageState["SelectedItem"]);
this.itemsViewSource.View.MoveCurrentTo(selectedItem);
}
}
}
protected virtual void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
}