C# 将属性从MainWindow更新为userControl

我在主窗口ZoomSlider中定义了属性，即数据绑定到Slider

在UserControl上，我有一个椭圆，它的高度以滑块值为界

主窗口代码

我成功地在UserControl中获得了默认的slider值，但是当slider的value属性更改时，它不会反映在UserControl中

那么，底线是如何将更新的滑块值获取到UserControl Ellipse

注:

UserControl绑定到UserControl Viewmodel，MainWindow到Window Viewmodel也是如此

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感谢您的帮助

ZoomSlider应具有DependencyProperty作为支持字段以启用绑定

public double ZoomSlider
{
   get { return (double)GetValue(ZoomSliderProperty); }
   set { SetValue(ZoomSliderProperty, value); }
}

// Using a DependencyProperty as the backing store for ZoomSlider.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty ZoomSliderProperty =
            DependencyProperty.Register("ZoomSlider", typeof(double), typeof(MainWindow), new PropertyMetadata(2d));

在此处放置转换器并检查。。。

<Ellipse  Stroke="Black">
   <Ellipse.Height>
      <MultiBinding Converter="{StaticResource zoomConverter}" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" NotifyOnSourceUpdated="True">

           <Binding Path="Dia" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" NotifyOnSourceUpdated="True"/>

           <Binding RelativeSource="{RelativeSource FindAncestor,AncestorType={x:Type Window}}" Path="ZoomSlider" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" 
         NotifyOnSourceUpdated="True" PresentationTraceSources.TraceLevel="High"/>

      </MultiBinding> 

private double zoomSlider = 2;

public double ZoomSlider
{
    get { return zoomSlider; }
    set
    {
        zoomSlider = value;
        NotifyPropertyChanged("ZoomSlider");
    }
}

public double ZoomSlider
{
   get { return (double)GetValue(ZoomSliderProperty); }
   set { SetValue(ZoomSliderProperty, value); }
}

// Using a DependencyProperty as the backing store for ZoomSlider.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty ZoomSliderProperty =
            DependencyProperty.Register("ZoomSlider", typeof(double), typeof(MainWindow), new PropertyMetadata(2d));