/// <summary>
/// 使用在导航过程中传递的内容填充页。在从以前的会话
/// 重新创建页时，也会提供任何已保存状态。
/// </summary>
/// <param name="sender">
/// 事件的来源; 通常为 <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">事件数据，其中既提供在最初请求此页时传递给
/// <see cref="Frame.Navigate(Type, Object)"/> 的导航参数，又提供
/// 此页在以前会话期间保留的状态的
/// 字典。 首次访问页面时，该状态将为 null。</param>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
// TODO: 创建适用于问题域的合适数据模型以替换示例数据
var group = await SampleDataSource.GetGroupAsync((String)e.NavigationParameter);
this.DefaultViewModel["Group"] = group;
this.DefaultViewModel["Items"] = group.Items;
}
/// <summary>
/// 使用在导航过程中传递的内容填充页。 在从以前的会话
/// 重新创建页时，也会提供任何已保存状态。
/// </summary>
/// <param name="sender">
/// 事件的来源; 通常为 <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">事件数据，其中既提供在最初请求此页时传递给
/// <see cref="Frame.Navigate(Type, Object)"/> 的导航参数，又提供
/// 此页在以前会话期间保留的状态的
/// 字典。 首次访问页面时，该状态将为 null。</param>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
// Featured recipe
var favorites = await SampleDataSource.GetFavoriteRecipesAsync(1);
this.DefaultViewModel["Section1Item"] = favorites.SingleOrDefault();
// International Cuisine
var groups = await SampleDataSource.GetGroupsAsync();
this.DefaultViewModel["Section2Items"] = groups;
// Top rated
var topRated = await SampleDataSource.GetTopRatedRecipesAsync(6);
this.DefaultViewModel["Section3Items"] = topRated;
this.DefaultViewModel["ZoomedOutList"] = this.GetSectionList();
var sampleDataGroups = await DataSource.GetGroupsAsync();
this.DefaultViewModel["Items"] = sampleDataGroups;
}
/// <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 DataSource.GetGroupAsync((String)e.NavigationParameter);
this.DefaultViewModel["Group"] = group;
if (e.PageState == 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 DataSource.GetGroupAsync((String)e.PageState["SelectedItem"]);
this.itemsViewSource.View.MoveCurrentTo(selectedItem);
}
}
}
