当集合中的属性更改时在转换器上触发“ConvertBack”？

我正在 MVVM WPF 应用程序中使用转换器从标记的枚举中“即时”创建复选框列表。bound 属性是一个 int，表示一个标记的枚举。这是我的转换器，它从 int 转换为 ObservableDictionary<int, bool>。

public class AccessListConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        int realValue;
        switch (value)
        {
            case int intValue:
                realValue = intValue;
                break;
            case AccessEnum enumValue:
                realValue = (int)enumValue;
                break;
            default:
                return Binding.DoNothing;
        } 

        List<AccessEnum> accessComponents = Enum.GetValues(typeof(AccessEnum)).Cast<AccessEnum>().Where(r => ((AccessEnum)realValue & r) == r).Select(r => r).ToList();
        ObservableDictionary<int, bool> accessDictionary = new ObservableDictionary<int, bool>(Enum.GetValues(typeof(AccessEnum)).Cast<int>().Select(i => i).ToDictionary(i => i, i => accessComponents.Contains((AccessEnum) i)));
        accessDictionary.Remove(0);
        return accessDictionary;
    }
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (!(value is Dictionary<int, bool> intDict))
        {
            throw new NotImplementedException();
        }
        return intDict.Sum(x => x.Value ? x.Key : 0);
    }
}

关键是用户可以挑选并选择要为属性启用的枚举。我认为使用转换器是有意义的，但是当勾选/取消勾选复选框时，我很难让转换器触发它的“ConvertBack”方法。

这是我在 Xaml 中的绑定：

<ItemsControl ItemsSource="{Binding Access, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource AccessListConverter}}" Margin="87,0,10,0">
<ItemsControl.ItemsPanel>
    <ItemsPanelTemplate>
        <StackPanel CanVerticallyScroll="False" Margin="0"/>
    </ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
    <DataTemplate>
        <CheckBox VerticalAlignment="Center" Margin="6,0,0,0" Content="{Binding Key, Converter={StaticResource AccessStringConverter}, UpdateSourceTrigger=PropertyChanged}" 
                    IsChecked="{Binding Value, UpdateSourceTrigger=PropertyChanged}" />
    </DataTemplate>
</ItemsControl.ItemTemplate>

现在我们进入了 Observable Dictionary 这就是我对 OBservableDictionary 的实现的样子（删除了不相关的部分，其余部分缩小了）：

 [Serializable]
public class ObservableDictionary<TKey, TValue> : 
    ObservableCollection<ObservableKeyValuePair<TKey, TValue>>, IDictionary<TKey, TValue>
{
    public ObservableDictionary() {}
    public ObservableDictionary(Dictionary<TKey, TValue> dictionary) : this()
    {
        foreach (TKey key in dictionary.Keys) { Add(key, dictionary[key]); }
    }
    public ObservableDictionary(ObservableDictionary<TKey, TValue> dictionary) : this()
    {
        foreach (TKey key in dictionary.Keys) { Add(key, dictionary[key]); }
    }

    public void Add(TKey key, TValue value)
    {
        if (ContainsKey(key)) { throw new ArgumentException("The dictionary already contains the key"); }
        Add(new ObservableKeyValuePair<TKey, TValue>() { Key = key, Value = value });
    }

    public ICollection<TKey> Keys => (from i in ThisAsCollection() select i.Key).ToList();
    public ICollection<TValue> Values => (from i in ThisAsCollection() select i.Value).ToList();
    public TValue this[TKey key]
    {
        get { if (!TryGetValue(key, out TValue result)) {throw new ArgumentException("Key not found"); } return result;  }
        set { if (ContainsKey(key)) { GetKvpByTheKey(key).Value = value; } else { Add(key, value); } }
    }
}

然后我实现了一个来自 StackOverflow 的 collectionChanged 代码片段

void TrulyObservableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.NewItems != null) foreach (object item in e.NewItems){ ((INotifyPropertyChanged) item).PropertyChanged += item_PropertyChanged; }
        if (e.OldItems != null) foreach (object item in e.OldItems) { ((INotifyPropertyChanged) item).PropertyChanged -= item_PropertyChanged;}
    }
    void item_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        NotifyCollectionChangedEventArgs a = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset);
        OnCollectionChanged(a);
    }

并添加CollectionChanged += TrulyObservableCollection_CollectionChanged;到空构造函数中。

但是没有骰子。经过数小时的搜索，我仍然空无一人。ConvertBack 永远不会被触发。我认为这可能是因为集合本身实际上并没有改变，但是我怎么能强制更新呢？非常感谢任何帮助:)

编辑：我可能已经以以下评论的形式发现了我自己问题的答案：https : //stackoverflow.com/a/59637445/3390519我会试一试！