Updating ResourceDictionary in code behind doesn't fire change notification

XAML Version: System XAML Scenario: When doing Hot reload in React Native, some styling needs to change as a response to the user changing app code out from under the app

  void SetResources(const xaml::FrameworkElement& fe, const JSValueObject& dict) {
    auto rd = ResourceDictionary();

    for (auto const& entry : dict) {
      const auto& name = entry.first;
      const auto& value = entry.second;
      auto brush = ColorUtils::SolidColorBrushFrom(value);

      rd.Insert(winrt::box_value(winrt::to_hstring(name)), brush);
    }
    fe.Resources(rd);
  }

Running through this code the first time correctly sets the value and it renders. The second time this code runs through, the control does not re-render. Removing the element from the ResourceDictionary does not fix it either

[chrisglein]

My expectation on how this should work, based on nothing but common sense 😄

Agreed. The developer expectation is that these should be dynamic. WPF had DynamicResource and that doesn’t exist in the StaticResource/ThemeResource system of system XAML and WinUI. It feels like a gap and one we need to resolve in the resource system design eventually.

[asklar]

Internal tracking: http://task.ms/39897009