passing Data

Question

When you pass data from viewModel to view Model, you would do something like

public partial class HomePageViewModel : ObservableObject {

    IAppService Service;
    IDataService _dataService;

    public ObservableCollection<Note> Notes { get; set; } = [];

    public HomePageViewModel(IAppService appService, IDataService dataService) {

        _dataService = dataService;
        Service = appService;
        GetAllNotes();
    }

    [RelayCommand]
    void GotoDtail(object note) {
        if (note is Note n) {
            Service.NavigateToAsync(nameof(DetailPage),
                new Dictionary<string, object> {
                { "note", n }
            });

and in the next viewModel

    [QueryProperty(nameof(ObjectPassed), "note")]
    public partial class DetailPageViewModel : ObservableObject {

        [ObservableProperty]
        Note? objectPassed;
    }
}

How would this work between windows?

Answer 1

Hello,

If you open the second window programmatically, you can pass data directly via the constructor.

 var secondWindow = new NewWindow1("this a data from first window");

 Application.Current.OpenWindow(secondWindow);

In the Second Window.

public partial class NewWindow1 : Window

{

	public NewWindow1(string dataService )

	{

		InitializeComponent();

      

        Page = new NewPage1(dataService);

	}

}

Or you use CommunityToolkit's WeakReferenceMessenger

Best Regards,

Leon Lu

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