为后面的代码中的xaml元素设置多绑定

Question

我有以下工作XAML代码,它基本上绑定了几个属性来计算我的用户控件的最终位置:

<UserControl x:Class="CurvePointControl"
    ....
         >
<UserControl.Resources>
    <local:VToYConverter x:Key="vToYConverter" />
</UserControl.Resources>
<UserControl.RenderTransform>
    <TranslateTransform x:Name="XTranslateTransform" >
        <TranslateTransform.Y>
            <MultiBinding Converter="{StaticResource vToYConverter}">
                <Binding ElementName="curveEditPoint" Path="V"/>
                <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type local:CurveEditor}}" Path="MinV"/>
                <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type local:CurveEditor}}" Path="MaxV"/>
                <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type local:CurveEditor}}" Path="ActualHeight"/>                    
            </MultiBinding>
        </TranslateTransform.Y>
    </TranslateTransform>
</UserControl.RenderTransform>

...

由于各种原因(但特别是为了避免相关来源,我现在正试图在代码中做同样的事情而没有成功.

这是我目前的代码:

    public CurvePointControl(CurveEditor CV)
    {
        InitializeComponent();

        MultiBinding multiBinding = new MultiBinding();
        multiBinding.Converter = m_VToYConverter;

        multiBinding.Bindings.Add(new Binding("V"));
        multiBinding.Bindings.Add(new Binding(CV.MinVProperty)); // doesn't work
        multiBinding.Bindings.Add(new Binding(CV.MaxVProperty)); // doesn't work
        multiBinding.Bindings.Add(new Binding(CV.ActualHeight)); // doesn't work       
        multiBinding.NotifyOnSourceUpdated= true;

        this.SetBinding(TranslateTransform.YProperty, multiBinding);
        //Doesn't work too:
        //BindingOperations.SetBinding(XTranslateTransform, TranslateTransform.YProperty, multiBinding);

    }

我仍然无法相信将XAML转换为c#代码是如此困难.转换器被调用但只有一次且没有有效的属性值.

什么是错的？我怎么能调试这样的问题？

Answer 1

你需要来源:

multiBinding.Bindings.Add(new Binding("V") { Source = curveEditPoint }); //If that object is accessible in the current scope.
multiBinding.Bindings.Add(new Binding("MinV") { Source = CV });
multiBinding.Bindings.Add(new Binding("MaxV") { Source = CV });
multiBinding.Bindings.Add(new Binding("ActualHeight") { Source = CV });