Binding to custom dependency property - again

Question

The task: implement the simplest Dependency Property ever, which can be used in xaml like that:

Answer 1

The Text property is located on the DataContext of the MainWindow not of the UserControl.

So change this line <uc:MyUserControl1 MyTextProperty="{Binding Text}"/> into this:

<uc:MyUserControl1 MyTextProperty="{Binding Text, ElementName=MyMainWindow}"/>

Which will tell the Binding that you're talking about the Text element located in you MainWindow. Of course, since in this example I used ElementName, you're going to want to name your window MyMainWindow...

So add this to your MainWindow:

<Window  Name="MyMainWindow" ..... />

If you rather not name your window, you can use the RelativeSource FindAncestor binding like this:

<wpfApplication6:MyUserControl1 MyTextProperty="{Binding Text, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"/>

In both ways, you are asking to find the property named 'Text' in the DataContext of the window.