使用组合的类中的MvvmLight

我有一个ViewModel,源于 MvvmLight.ViewModelBase 重用其他使用的组合:

要在合成中重用的类的简化版本:

class TimeFrameFactory
{
    public DateTime SelectedTime {get; set;}

    public ITimeFrame CreateTimeFrame() {...}
}

class GraphFactory
{
     public int GraphWidth {get; set;}

     public IGraph CreateGraph(ITimeframe timeframe) {...}
}

我的ViewModel从MvvmLight ViewModelBase派生,由以下两个部分组成:

class MyViewModel : ViewModelBase
{
    private readonly TimeFrameFactory timeFrameFactory = new TimeFrameFactory();
    private readonly GraphFactory graphFactory = new GraphFactory();

    private Graph graph;

    // standard MVVM light method to get/set a field:
    public Graph Graph
    {
        get => this.Graph;
        private set => base.Set(nameof(Graph), ref graph, value);
    }

    // this one doesn't compile:
    public DateTime SelectedTime 
    {
        get => this.timeFrameFactory.SelectedTime;
        set => base.Set(nameof(SelectedTime), ref timeFrameFactory.SelectedTime, value);
    }

    // this one doesn't compile:
    public int GraphWidth
    {
        get => this.timeFrameFactory.GraphWidth;
        set => base.Set(nameof(GraphWidth), ref timeFrameFactory.GraphWidth, value);
    }

    public void CreateGraph()
    {
        ITimeFrame timeFrame = this.timeFrameFactory.CreateTimeFrame();
        this.Graph = this.GraphFactory.CreateGraph(timeFrame);
    }
}

带有字段的Get/Set可以工作,但是如果要将属性转发给复合对象,则不能使用 base.Set

set => base.Set(nameof(GraphWidth), ref timeFrameFactory.GraphWidth, value);

属性上不允许ref。

    public int GraphWidth
    {
        get => this.timeFrameFactory.GraphWidth;
        set
        {
            base.RaisePropertyChanging(nameof(GraphWidh));
            base.Set(nameof(GraphWidth), ref timeFrameFactory.GraphWidth, value);
            base.RaisePropertyChanged(nameof(GraphWidh));
        }
    }

如果你要在很多地方做这件事,那就太麻烦了。有没有一个简单的方法可以做到这一点,可能类似于 ObservableObject.Set ?