protected override void OnNavigatedTo(NavigationEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
//查看是否可以返回，若可以返回，返回按钮视为可见，否则折叠
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = rootFrame.CanGoBack ?
AppViewBackButtonVisibility.Visible :
AppViewBackButtonVisibility.Collapsed;
ViewModel = ((ViewModels.MovieItemViewModel)e.Parameter);
if (ViewModel.SelectItem == null)
{
//当没有电影项被选中时，按钮显示为create
CreateBtn.Content = "Create";
//var i = new MessageDialog("Welcome!").ShowAsync();
}
else
{
//当电影项被选中时，按钮显示为update
CreateBtn.Content = "Update";
//将相关数据赋值给对应条目，使被选中的电影项的数据显示出来
Description.Text = ViewModel.SelectItem.description;
Title.Text = ViewModel.SelectItem.title;
Rank.SelectedValue = ViewModel.SelectItem.rank;
Review.Text = ViewModel.SelectItem.review;
// ...
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
DataTransferManager.GetForCurrentView().DataRequested += OnShareDataRequested;
if (rootFrame.CanGoBack)
{
// Show UI in title bar if opted-in and in-app backstack is not empty.
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
AppViewBackButtonVisibility.Visible;
}
else
{
// Remove the UI from the title bar if in-app back stack is empty.
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
AppViewBackButtonVisibility.Collapsed;
}
if (e.Parameter.GetType() == typeof(ViewModels.MovieItemViewModel))
{
this.ViewModel = (ViewModels.MovieItemViewModel)(e.Parameter);
}
}