使用 GridView，我绑定到可观察集合中的多个项目。当我进入捕捉模式时，我的 GridView 无法加载任何数据，并且没有任何项目是可点击的。请参阅随附的屏幕截图。我的应用程序在左侧，它显示精选和收藏夹。这是我的代码：
public sealed partial class RestaurantHomePage : MenuFinderWin8.Common.LayoutAwarePage
{
MenuFinderAppServiceClient serviceClient;
RestaurantRepository repository;
Geolocator _geolocator = null;
ObservableCollection<RestaurantLocation> items;
public RestaurantHomePage()
{
this.InitializeComponent();
if (!Network.IsNetwork())
{
return;
}
repository = new RestaurantRepository();
serviceClient = new MenuFinderAppServiceClient();
_geolocator = new Geolocator();
items = new ObservableCollection<RestaurantLocation>();
//BindData();
}
void btnAbout_Click(object sender, RoutedEventArgs e)
{
Flyout f = new Flyout();
LayoutRoot.Children.Add(f.HostPopup); // add this to some existing control in your view like the root visual
// remove the parenting during the Closed event on the Flyout
f.Closed += (s, a) =>
{
LayoutRoot.Children.Remove(f.HostPopup);
};
// Flyout is a ContentControl so set your content within it.
SupportUserControl userControl = new SupportUserControl();
userControl.UserControlFrame = this.Frame;
f.Content = userControl;
f.BorderBrush = new SolidColorBrush(Windows.UI.Color.FromArgb(255, 223, 58, 51));
f.Width = 200;
f.Height = 200;
f.Placement = PlacementMode.Top;
f.PlacementTarget = sender as Button; // this is an UI element (usually the sender)
f.IsOpen = true;
}
void btnSearch_Click(object sender, RoutedEventArgs e)
{
Flyout f = new Flyout();
LayoutRoot.Children.Add(f.HostPopup); // add this to some existing control in your view like the root visual
// remove the parenting during the Closed event on the Flyout
f.Closed += (s, a) =>
{
LayoutRoot.Children.Remove(f.HostPopup);
};
// Flyout is a ContentControl so set your content within it.
RestaurantSearchUserControl userControl = new RestaurantSearchUserControl();
userControl.UserControlFrame = this.Frame;
f.Content = userControl;
f.BorderBrush = new SolidColorBrush(Windows.UI.Color.FromArgb(255, 223, 58, 51));
f.Width = 600;
f.Height = 400;
f.Placement = PlacementMode.Top;
f.PlacementTarget = sender as Button; // this is an UI element (usually the sender)
f.IsOpen = true;
}
void btnViewFavorites_Click(object sender, RoutedEventArgs e)
{
App.DataMode = Mode.SavedRestaurant;
if (repository.GetGroupedRestaurantsFromDatabase().Count() == 0)
{
MessageDialog messageDialog = new MessageDialog("You have no saved restaurants.", "No Restaurants");
messageDialog.ShowAsync();
}
else
{
this.Frame.Navigate(typeof(RestaurantSearchDetails));
}
}
private async void BindData()
{
try
{
items = await serviceClient.GetSpecialRestaurantsAsync();
List<RestaurantLocation> myFavs = repository.GetRestaurantLocations();
foreach (var a in myFavs)
{
items.Add(a);
}
this.DefaultViewModel["Items"] = items;
}
catch (Exception)
{
MessageDialog messsageDialog = new MessageDialog("The MenuFinder service is unavailable at this time or you have lost your internet connection. If your internet is OK, please check back later.", "Unavailable");
messsageDialog.ShowAsync();
btnAbout.IsEnabled = false;
btnSearch.IsEnabled = false;
btnViewFavorites.IsEnabled = false;
}
myBar.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
/// <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="navigationParameter">The parameter value passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
/// </param>
/// <param name="pageState">A dictionary of state preserved by this page during an earlier
/// session. This will be null the first time a page is visited.</param>
protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
BindData();
// TODO: Assign a bindable collection of items to this.DefaultViewModel["Items"]
}
private void itemGridView_ItemClick_1(object sender, ItemClickEventArgs e)
{
App.CurrentRestaurantLocation = e.ClickedItem as RestaurantLocation;
if (App.CurrentRestaurantLocation != null)
{
Order order = repository.AddOrder(DateTime.Now, string.Empty, App.CurrentRestaurantLocation.ID);
App.CurrentOrder = order;
App.DataMode = Mode.Menu;
this.Frame.Navigate(typeof(RootViewPage));
}
}
}
