WPF binding OneWayToSource sets source property to “” when the DataContext is changed

Question

I have a OneWayToSource binding that is not behaving as I expected when I set the DataContext of the target control. The property of the source is being set to default inste

Answer 1

Here you will have to UpdateSource like below:

 private void Button1_Click(object sender, RoutedEventArgs e)
   {

      Debug.Print("'Set DataContext' button clicked");
      tb.DataContext = _vm;
      var bindingExp = tb.GetBindingExpression(TextBox.TextProperty);
      bingExp.UpdateSource();
   }