Question

如何在代码后面实现以下xaml绑定？

<Canvas x:Name="_YAxis">
    <Label Content="0.2" Canvas.Left="25" Canvas.Bottom="{Binding ElementName=_YAxis, Path=ActualHeight, Converter={StaticResource myPercentageOf}, ConverterParameter={StaticResource Constant_pt2} }"  />
</Canvas>

注意，转换器只是将Canvas的实际高度乘以0.2

我可以理清大多数类型的绑定，但这个让我感到难过。

我可以使用

创建绑定

Label label = new Label() { label.Content = "0.2" };

Binding binding = new Binding("ActualHeight");
binding.Source = _YAxis;

// attach binding ???

_YAxis.Children.Add(label);

但是如何将绑定附加到Canvas.Left附加属性？

Answer 1

你走了：

    Binding b = new Binding();
    b.Path = new PropertyPath("ActualHeight");
    b.Source = _YAxis;// OR b.ElementName = "_YAxis"
    b.Converter = Resources["myPercentageOf"];
    b.ConverterParameter = Resources["Constant_pt2"];

    Label label = new Label() { label.Content = "0.2" };
    _YAxis.Children.Add(label);
    label.SetBinding(Canvas.BottomProperty, b); //Binding Canvas.Bottom to ActualHeight of _YAxis
    Canvas.SetLeft(label, 25); //Setting Canvas.Left

绑定到后面的代码中的附加属性

1 个答案: