根据同一ListView - MVVM中的selected items属性过滤ICollectionView

// 定义一个ViewModel，包含一个ListView绑定的集合和一个ICollectionView
public class MyViewModel : INotifyPropertyChanged
{
    private ObservableCollection<MyItem> _items;
    private ICollectionView _filteredItems;

    public ObservableCollection<MyItem> Items
    {
        get { return _items; }
        set
        {
            _items = value;
            OnPropertyChanged(nameof(Items));
        }
    }

    public ICollectionView FilteredItems
    {
        get { return _filteredItems; }
        set
        {
            _filteredItems = value;
            OnPropertyChanged(nameof(FilteredItems));
        }
    }

    public ICommand FilterCommand { get; }

    public MyViewModel()
    {
        // 初始化集合和ICollectionView
        Items = new ObservableCollection<MyItem>();
        FilteredItems = CollectionViewSource.GetDefaultView(Items);

        // 绑定过滤命令
        FilterCommand = new RelayCommand(FilterItems);
    }

    private void FilterItems(object parameter)
    {
        // 获取选中的项
        var selectedItems = (IEnumerable<MyItem>)parameter;

        // 设置过滤方法
        FilteredItems.Filter = item =>
        {
            var myItem = (MyItem)item;
            return selectedItems.Contains(myItem);
        };
    }

    // 实现INotifyPropertyChanged接口
    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

// 定义一个数据模型
public class MyItem
{
    public string Name { get; set; }
    public string Category { get; set; }
    // 其他属性...
}