navigation: transfering object

Question

Hi,
thank you for your time. Be aware:  I'm a MAUI beginner!

The final objektiv: when pressing the 'Button' in the 'MainPage' --> show the objects (images) in the 'AreaPage'.
PS: I made my test-app public: 'github.com/edikaufmann/HikeFinder'

some remarks, now:
- only the Button: VAR-Haute, Command="{Binding VARhCommand}" is (yet) potentially made to navigate to the 'AreaPage'
  using 'await Shell.Current.GoToAsync......'. See also AppShell etc. 
  (the other Buttons still use the MainPage as target)

when navigating to the new page (AreaPage); the page comes up BUT I never see the objects I intend to transfer.

- as said, the 'AreaPage' comes up but does NOT show/keep any content! BUT, when going back, the content shows in the 'MainPage'
- I  guess I screw something with the object / program logic!

thanks for taking the time

any help is appreciated
ed

Answer 1

Hello,

when navigating to the new page (AreaPage); the page comes up BUT I never see the objects I intend to transfer.

Please open your AreaViewModel.cs to achieve IQueryAttributable interface, then you can get data in the ApplyQueryAttributes method by query["Hikes"]. You can refer to following code.

public partial class AreaViewModel : BaseViewModel, IQueryAttributable
{
    public ObservableCollection<Hike> Hikes { get; } = new();
    [ObservableProperty]
    Hike hike;
    [ObservableProperty]
    bool isRefreshing;
    public void ApplyQueryAttributes(IDictionary<string, object> query)
    {
        ObservableCollection<Hike> rawList = query["Hikes"] as ObservableCollection<Hike>;
        foreach (Hike item in rawList)
        {
            Hikes.Add(item);
        }
    }
}

Please remove [QueryProperty(nameof(Hike), "Hike")] as well.

Best Regards,

Leon Lu

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