cross-platform approach

Question

I have his method

      void OnPinMarkerClicked(object turbine)
        {
            if (turbine != null)
            {
#if ANDROID || IOS
                Shell.Current.GoToAsync($"{nameof(TurbineDetailPage)}",
                     true,
                     new Dictionary<string, object> {
                    { "SelectedTurbine", turbine }
                });
#elif WINDOWS || MACCATALYST
                var viewModel = _serviceProvider.GetRequiredService<TurbineDetailPageViewModel>();
                var page = new TurbineDetailPage(viewModel);
                Application.Current!.OpenWindow(new Window(page));
#endif

And it navigates with my data on mobile

but on desktop I don't get anything

public partial class TurbineDetailPage : ContentPage
{
    public TurbineDetailPage(TurbineDetailPageViewModel turbineDetailVViewModel)
    {
        InitializeComponent();
        BindingContext = turbineDetailVViewModel;
    }
}

VM

    [QueryProperty(nameof(SelectedTurbine), "SelectedTurbine")]
    public partial class TurbineDetailPageViewModel : ObservableObject
    {
        [ObservableProperty]
        TurbinePin? selectedTurbine;
    }
}

i MADE THAT HAPPENED WITH THIS

  var viewModel = _serviceProvider.GetRequiredService
      <TurbineDetailPageViewModel>();
  viewModel.SelectedTurbine = (TurbinePin)turbine;
  var page = new TurbineDetailPage(viewModel);
  var secondWindow = new Window(page);
  var existingWindow = Application.Current!.Windows.FirstOrDefault(
      w => w.Page is TurbineDetailPage detailPage
      && detailPage.BindingContext == viewModel);
  if (existingWindow != null)
  {
      Application.Current?.ActivateWindow(existingWindow);
  }
  else
  {
      Application.Current!.OpenWindow(secondWindow);
  }

Answer 1

Hello,

Answer from Eduardo Gomez Romero

it was a singleton, I fixed it with transient.

Please set TurbineDetailPageViewModel to the transient in MauiProgram.cs.

var services = builder.Services;

services.AddTransient<TurbineDetailPageViewModel>();

Best Regards,

Leon Lu

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