MVVM WPF 删除多个选定项目

是ListBox的，有汽车清单

<ListBox x:Name="autoList" Grid.Column="0" ItemsSource="{Binding Auto}"  
         SelectedItem="{Binding SelectedAuto}">

我有一个包含数据库中数据的集合ObservableCollection<Auto> Auto;

如何删除列表框中选中的多辆汽车？删除 1 auto 使用以下代码

public RelayCommand DeleteCommand
    {
        get
        {

            return deleteCommand ??
                   (deleteCommand = new RelayCommand((selectedItem) =>
                   {
                       MessageBoxResult result = MessageBox.Show("Вы действительно желаете удалить элемент?", "Удаление", MessageBoxButton.YesNo, MessageBoxImage.Question);
                       if (selectedAuto == null || result == MessageBoxResult.No) return;
                       // получаем выделенный объект
                       Auto auto = selectedAuto as Auto;
                       db.Autos.Remove(auto);
                       db.SaveChanges();
                       OnPropertyChanged("HasAuto");
                   }, CanEditOrDeleteAuto));
        }
    }

该类Auto看起来像这样（数据库表看起来一样）

class Auto : INotifyPropertyChanged
{
    private string model;
    private string marka;
    private int cost;
    private int maxSpeed;

    public int Id { get; set; }

    public string Model
    {
        get
        {
            return model;
        }

        set
        {
            model = value;
            OnPropertyChanged("Model");
        }
    }

    public string Marka
    {
        get
        {
            return marka;
        }

        set
        {
            marka = value;
            OnPropertyChanged("Marka");
        }
    }

    public int Cost
    {
        get
        {
            return cost;
        }

        set
        {
            cost = value;
            OnPropertyChanged("Cost");
        }
    }

    public int MaxSpeed
    {
        get
        {
            return maxSpeed;
        }

        set
        {
            maxSpeed = value;
            OnPropertyChanged("MaxSpeed");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged([CallerMemberName]string prop = "")
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(prop));
    }
}

我得到这样的数据库

public class ApplicationContext : DbContext
{
    public ApplicationContext() : base("DefaultConnection")
    {
    }
    public DbSet<Auto> Autos { get; set; }
}

视图模型

ObservableCollection<Auto> autos;
    private Auto selectedAuto;
    public ObservableCollection<Auto> Autos
    {
        get { return autos; }
        set
        {
            autos = value;
            OnPropertyChanged("Autos");
        }
    }

    public Auto SelectedAuto
    {
        get
        {
            return selectedAuto;
        }

        set
        {
            selectedAuto = value;
            OnPropertyChanged("SelectedAuto");
        }
    }
    public ApplicationViewModel()
    {
        db = new ApplicationContext();
        db.Autos.Load();
        Autos = db.Autos.Local;
    }

UDP2 标记

<Button Content="Удалить" Margin="10" Command="{Binding DeleteCommand}" Style="{StaticResource InformButton}"
                CommandParameter="{Binding SelectedItems, ElementName=autoList}"  />

虚拟机代码

public ICommand DeleteCommand => new RelayCommand(o => Delete((Collection<object>)o));

    private void Delete(Collection<object> o)
    {
        List<Auto> list = o.Select(e => (Auto)e).ToList();
        list.ForEach(auto => Autos.Remove(auto));
    }