winui 3 FindAncestor

Hi Jeanine:

             Both suggestions are not working.  Let me give a clearer picture,

The MainWindow consists of ContentControl which has a content binding to aan object.( name of CurrentContent)

The MainWindow "Datacontext" is bound with ViewModel with the name of Mvm. The Mvm is initialized during Window loading.

The CurrentContent will have an object loaded (a UserControl with a simple Textblock).

In the Mvm, there is a string property RuntimeStr wh

  UserPage Page1; 
public MainViewModel()
 {
     Page1= new UserPage();
     CurrentContent = Page1;
     RuntimeStr = "Hello Wirkd";
 }

 [ObservableProperty]
 private object _currentContent;

[ObservableProperty]
 private string _runtimeStr;

        public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("RuntimeStr", typeof(string), typeof(MainWindow), new PropertyMetadata("AAA")); 

   <TextBlock x:Name="T" Text="{Binding RuntimeStr,ElementName=Mwindow}" />

//x:Name="Mwindow" is the name of MainWindow that consists of ContentControl

Is there anyway or am I doing wrong?

When the target and source elements reside in different XAML namescopes or when the source element has been created dynamically, this doesn’t work.

I recommended that you try to use the second method: use a custom attached property to bind.

You could refer to the sample: https://github.com/mgnsm/CodeSamples/tree/master/BindingToParentElementSample

Have you got any updates about this issue? Could you please check my suggestion?

Hi Jeanine:

When using ElementName in binding, does it target to the nearest ancestor or the first element from root? if the ancestor is a template and may duplicated several times?