DependencyObject.InvalidateProperty not working

Question

Based on the documentation via MSDN...

You can also use InvalidateProperty to force re-evaluation of a binding against a data source that is not a

Answer 1

we never got it working either, here's the function which does the trick:

private void InvalidateProperty(DependencyProperty property,
    FrameworkElement container)
{
    container.SetBinding(property, 
        container.GetBindingExpression(property).ParentBinding);
}

And here's how we call it:

private void Invalidate(object sender, RoutedEventArgs e)
{
    _payload.Timestamp = DateTime.Now.Add(TimeSpan.FromHours(1)).ToLongTimeString();

    Button b = sender as Button;

    //b.InvalidateProperty(Button.ContentProperty);
    this.InvalidateProperty(Button.ContentProperty, b);
}

I also had to set DataContext to _payload.