practice/practiceApplicaiton/BookingsPage.xaml.cs

namespace practiceApplicaiton;

public partial class BookingsPage : ContentPage
{
    private Booking? _selected;
    public bool CanEdit => Database.IsAdmin;

    public BookingsPage()
    {
        InitializeComponent();
        BindingContext = this;
    }

    protected override async void OnAppearing()
    {
        base.OnAppearing();
        await LoadAsync();
    }

    private async Task LoadAsync(string search = "")
    {
        try
        {
            var data = await Repository.GetBookingsAsync(search);
            BookingsList.ItemsSource = data;
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ошибка", ex.Message, "OK");
        }
    }

    private async void OnSearchChanged(object sender, TextChangedEventArgs e)
        => await LoadAsync(e.NewTextValue);

    private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        _selected = e.CurrentSelection.FirstOrDefault() as Booking;
        EditButton.IsEnabled = _selected != null;
        DeleteButton.IsEnabled = _selected != null;
    }

    private async void OnAddClicked(object sender, EventArgs e)
    {
        await Navigation.PushAsync(new BookingEditPage(null));
        await LoadAsync();
    }

    private async void OnEditClicked(object sender, EventArgs e)
    {
        if (_selected == null) return;
        await Navigation.PushAsync(new BookingEditPage(_selected));
        await LoadAsync();
    }

    private async void OnDeleteClicked(object sender, EventArgs e)
    {
        if (_selected == null) return;
        bool confirm = await DisplayAlert("Удалить",
            $"Удалить бронирование #{_selected.BookingId}?", "Да", "Отмена");
        if (!confirm) return;
        try
        {
            await Repository.DeleteBookingAsync(_selected.BookingId);
            await LoadAsync();
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ошибка", ex.Message, "OK");
        }
    }
}