我为了绑定一个Command以便从一个已分组的ListView中删除一个项目而疯狂。 我的ViewModels继承自BaseViewModel，以简化属性更改的通知。 我通过使用两个ObservableCollections遵循了似乎是正确的通用方法。

这些是我的ViewModel，可以正确显示，但是我无法将RemoveCommand绑定到每个项目（ArticleForOrdineOTIVM类型）。我使用了构造函数来创建虚拟对象。 我在Command =“”内的xaml文件中尝试了各种组合，例如通过将Source reference指向listview名称，但是无法使其工作。它总是说我无法到达内部Context的范围，但是至多我只能在OrderOTIVM内绑定一个命令，而不能绑定其他命令（例如，命令“ TestCommand”）。我需要这样做是因为我想删除，编辑和处理列表中的每个项目，并且之前解释的错误说：

绑定：在'System.Collections.ObjectModel.ObservableCollection`1 [BrScanner.ViewModels.GroupedArticlesVM]'上找不到'RemoveCommand'属性，目标属性：'Xamarin.Forms.Button.Command'

在View文件中，将BindingContext设置为：

public partial class OrderOTIView : ContentPage
    {
        public OrderOTIView()
        {
                InitializeComponent();
        OrderOTIVM orderOTIViewModel = new OrderOTIVM();
            BindingContext = orderOTIViewModel;
        }
    }

这些是我的ViewModels

public class OrderOTIVM : BaseViewModel
    {
        ObservableCollection<GroupedArticlesVM> _carrelliGrouped;
        public ObservableCollection<GroupedArticlesVM> CarrelliGrouped { get => _carrelliGrouped; set {  _carrelliGrouped = value; OnPropertyChanged();}
        }

        public OrderOTIVM()
        {
            CarrelliGrouped = new ObservableCollection<GroupedArticlesVM>();
            GroupedArticlesVM car1 = new GroupedArticlesVM();
            car1.Carrello.Nome = "Carrello A";
            CarrelliGrouped.Add(car1);

            GroupedArticlesVM car2 = new GroupedArticlesVM();
            car2.Carrello.Nome = "Carrello B";
            CarrelliGrouped.Add(car2);

        }
    public Command TestCommand
            {
                get
                {
                    return new Command(
                        (x) => {
                            Debug.WriteLine("TestCommand");
                        });
                }
            }
    }

    public class GroupedArticlesVM :  ObservableCollection<ArticleForOrdineOTIVM>
    {
        CarrelloMinimarketvm _carrello;
        public CarrelloMinimarketvm Carrello { get => _carrello; set { _carrello = value; } }

        public GroupedArticlesVM()
        {
            Items.Add(new ArticleForOrdineOTIVM());
            Items.Add(new ArticleForOrdineOTIVM());
            Items.Add(new ArticleForOrdineOTIVM());
            Items.Add(new ArticleForOrdineOTIVM());

            Carrello = new CarrelloMinimarketvm();
        }


        public Command<ArticleForOrdineOTIVM> RemoveCommand
        {
            get
            {
                return new Command<ArticleForOrdineOTIVM>(
                    (articolo)=>{
                        Items.Remove(articolo);
                });
            }
        }

    }

    public class CarrelloMinimarketvm : BaseViewModel
    {
        string _nome;

        public CarrelloMinimarketvm()
        {
            this.Nome = "CARRELLO";
        }

        public string Nome { get => _nome; set { _nome = value; OnPropertyChanged(); } }
    }

    public class ArticleForOrdineOTIVM : BaseViewModel
    {
        string _oarti;
        string _tarti;
        int _amount;

        public string Oarti { get => _oarti;    set {   _oarti = value;     OnPropertyChanged(); } }
        public string Tarti { get => _tarti;    set {   _tarti = value;     OnPropertyChanged(); } }
        public int Amount { get => _amount;     set {   _amount = value;    OnPropertyChanged(); } }

        public ArticleForOrdineOTIVM()
        {
            this.Oarti = "Oarti blabla";
            this.Tarti = "Descrizione blabla";
            this.Amount = 22;
        }  
    }

这是我的Xaml代码：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Class="BrScanner.Views.OrderOTIView"
             x:Name="OrderOTIPage"
             >
            <ListView x:Name="carrelliListView" ItemsSource="{Binding CarrelliGrouped}"
                      HasUnevenRows="True"
                      GroupDisplayBinding="{Binding Carrello.Nome}"
                      IsGroupingEnabled="True">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <StackLayout Orientation="Horizontal" Padding="10">
                                <Label Text="{Binding Oarti}"/>
                                <Label Text="{Binding Tarti}"/>
                                <Button Text="cancella" 

                                        Command="{Binding Path=BindingContext.CarrelliGrouped.RemoveCommand,Source={x:Reference Name=OrderOTIPage}}"
                                        commandparameter="{Binding .}"/>
                            </StackLayout>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

我的BaseViewModel：

public class BaseViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this,new PropertyChangedEventArgs(propertyName));
        }
    }

感谢您的时间！