How can I access the parent usercontrols elements from the child user control in wpf?

Question

如何从wpf的子用户控件访问父usercontrol的元素？

Answer 1

Using VisualTreeHelper you can find Parent control's by GetParent() method. If you want to find parent control in Templates you can take help of RelativeSource FindAncestor .

Answer 2

If you need those elements to get their values, eg for binding, you can use this construction (here the background of the element will be using the values of its parent):

Background="{Binding Path=BorderBrush, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}}

In the code, for every element extending FrameworkElement class, there is Parent property, just cast it to the correct type (I assume you know, what type it is) and you're done.