navigation: transfering object

Eduard Kaufmann 41 Reputation points
2023-01-24T08:12:07.8133333+00:00
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
.NET MAUI
.NET MAUI
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
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Accepted answer
  1. Leon Lu (Shanghai Wicresoft Co,.Ltd.) 42,061 Reputation points Microsoft Vendor
    2023-01-25T05:14:07.2733333+00:00

    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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