我有两个嵌套的可观察的集合，第一个是工作日的列表，第二个是这一天的可用小时。我需要一个按钮，可以单独删除这些小时中的任何一个。但不能实现命令“RemoveHour”被正确调用时，“REMOVE”标签被点击。我有这个到目前为止：
程式码后置

public static ObservableCollection<Calendar> CalendarDays { get; set; } = new ObservableCollection<Calendar>();

        public AgendaAutoDispon()
        {
            InitializeComponent();
            InitializeCalendar();
            CalendarDays.Add(new Calendar(DateTime.Today));
            CalendarDays.Add(new Calendar(DateTime.Today.AddDays(1)));
            CalendarDays.Add(new Calendar(DateTime.Today.AddDays(2)));
            CollectionViewDatas.BindingContext = CalendarDays;
        }

public class Calendar : INotifyPropertyChanged
        {
            public Picker HourPicker { get; set; } = new Picker();
            public ObservableCollection<string> Hours { get; set; } = new();
            public ObservableCollection<string> HoursReceipt { get; set; } = new();

            public Calendar(DateTime day)
            {
                Day = day;
                for (int i = 6; i <= 22; i++)
                {
                    HoursReceipt.Add((i < 10 ? "0" + i.ToString() : i.ToString()) + ":00");
                    HoursReceipt.Add((i < 10 ? "0" + i.ToString() : i.ToString()) + ":30");
                }
                NotifyPropertyChanged("HoursReceipt");
            }

            private string _DateShow;
            public string DateShow
            {
                get => _DateShow;
                set
                {
                    _DateShow = value;
                    NotifyPropertyChanged("DateShow");
                }
            }

            private DateTime _Day { get; set; }
            public DateTime Day
            {
                get => _Day;
                set
                {
                    _Day = value;
                    switch (value.DayOfWeek)
                    {
                        case DayOfWeek.Sunday: WeekDay = "Sunday"; break;
                        case DayOfWeek.Monday: WeekDay = "Monday"; break;
                        case DayOfWeek.Tuesday: WeekDay = "Tuesday"; break;
                        case DayOfWeek.Wednesday: WeekDay = "Wednesday"; break;
                        case DayOfWeek.Thursday: WeekDay = "Thursday"; break;
                        case DayOfWeek.Friday: WeekDay = "Friday"; break;
                        case DayOfWeek.Saturday: WeekDay = "Saturday"; break;
                    }
                    DateShow = value.ToString("dd/MM/yyyy");
                    NotifyPropertyChanged("Day");
                }
            }

            private string _WeekDay;
            public string WeekDay
            {
                get => _WeekDay;
                set
                {
                    _WeekDay = value;
                    NotifyPropertyChanged("WeekDay");
                }
            }

            public string HourChangedEvent
            {
                set
                {
                    if (!Hours.Contains(value))
                    {
                        Hours.Add(value);
                        Hours = new ObservableCollection<string>(Hours.OrderBy(i => i));
                        NotifyPropertyChanged("Hours");
                    }
                }
            }

            public Command RemoveHour
            {
                get
                {
                    return new Command((arg) => {
                        Console.WriteLine("I SHOULD REMOVE =====> "+(string)arg);
                    });
                }
            }

            public event PropertyChangedEventHandler PropertyChanged;
            void NotifyPropertyChanged(string propChanged)
            {
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs(propChanged));
            }

        }

XAML语言

<CollectionView x:Name="CollectionViewDates" BindingContext="{Binding CalendarDays}" ItemsSource="{Binding .}"
    VerticalOptions="Center" Margin="0,10,0,0">

    <CollectionView.ItemsLayout>
        <GridItemsLayout Orientation="Horizontal" HorizontalItemSpacing="10" />
    </CollectionView.ItemsLayout>
    <!-- WEEK DAYS -->
    <CollectionView.ItemTemplate>
        <DataTemplate>
            <Frame CornerRadius="15" Padding="0" Margin="5" HasShadow="False" BorderColor="LightGray">
                <Grid HeightRequest="300" WidthRequest="200" HorizontalOptions="CenterAndExpand">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="30" />
                        <RowDefinition Height="30" />
                        <RowDefinition Height="30" />
                        <RowDefinition Height="*" />

                    </Grid.RowDefinitions>

                    <Label Text="{Binding WeekDay}" Grid.Row="0" TextColor="#4D4D4D" FontSize="20"
                        HorizontalTextAlignment="Center" FontAttributes="Bold" Margin="0,5,0,0" />
                    <Label Text="{Binding DateShow}" Grid.Row="1" Margin="0,3,0,0" TextColor="#4D4D4D" FontSize="18"
                        HorizontalTextAlignment="Center" />

                    <!-- HOURS -->
                    <CollectionView Grid.Row="3" ItemsSource="{Binding Hours}">
                        <CollectionView.ItemsLayout>
                            <GridItemsLayout Orientation="Vertical" VerticalItemSpacing="5" />
                        </CollectionView.ItemsLayout>

                        <CollectionView.ItemTemplate>
                            <DataTemplate>
                                <Grid HeightRequest="30">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*" />
                                        <ColumnDefinition Width="30" />
                                    </Grid.ColumnDefinitions>

                                    
                                    <Label Grid.Column="0" Text="{Binding .}" HorizontalTextAlignment="Center" />

                                    <Label Grid.Column="1" Text="REMOVE" FontSize="20" TextColor="Red" Padding="0"
                                        HorizontalTextAlignment="Center">
                                        
                                        <Label.GestureRecognizers>
                                            <TapGestureRecognizer
                                                Command="{Binding WHAT SHOULD I HAVE HERE??? }"
                                                CommandParameter="{Binding .}" />
                                        </Label.GestureRecognizers>
                                    </Label>
                                </Grid>

                            </DataTemplate>
                        </CollectionView.ItemTemplate>
                        
                    </CollectionView>

                </Grid>
            </Frame>
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>

我必须做些什么来达到绑定的前一个级别，其中有命令RemoveHour？