绑定到后面代码中的相对源

在我的 UserControl 中，我的 XAML 中有以下代码

<TextBlock Grid.Row="2" Text="{Binding Path=StartTime,
                               RelativeSource={RelativeSource Mode=FindAncestor,
                                AncestorLevel=1, AncestorType=Window}}" />

这只是从父窗口获取属性的值，而且效果很好。

我怎样才能在后面的代码中做到这一点？

Binding b = new Binding();
b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor,
                                      typeof(Window), 1);
b.Path = "StartTime";

myProperty = b.value;// obviously there is no b.value but this
                     // is what I'm trying to achieve.

//BindingOperations.SetBinding(StartTime, StartTimeProperty, b);
//This does not work sadly, it can't convert string to DependancyObject

Give x:Name到你的文本块 -

那么你可以在后面的代码中这样做 -

Binding b = new Binding("StartTime");
b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor,
                                         typeof(Window), 1);
textBlock.SetBinding(TextBlock.TextProperty, b);