UWP changing ResourceDictionary programmatically - xaml

Question

I am designing an app that retrieves colors from a REST API and needs to use these to theme the app. I am trying to define the colors inside of styles in my ResourceDictionary since one of the colors I need to set is the PointerOver VisualState of a button. I am currently using the below method to change the SolidColorBrushes.
App.Current.Resources["PrimaryBrush"] = myNewSolidColorBrush;
When I bind my element's background directly to this StaticResurce the colors work perfectly. But, when I move this inside of a style into my separate file with a ResourceDictionary and bind the background inside the style to the to that SolidColorBrush resource that I am changing.
My problem is that when I change the SolidColorBrush programmatically, the binding in my style does not update! Is there a way to either force the resource dictionary to revaluate its bindings or programmatically change the setter values in my defined style?

Answer 1

My problem is that when I change the SolidColorBrush programmatically, the binding in my style does not update!
<ResourceDictionary>
<SolidColorBrush x:Key="PrimaryBrush" Color="Yellow"/>
</ResourceDictionary>
The problem is that you have assigned the new myNewSolidColorBrush object to PrimaryBrush, and the StaticResource doesn't support dynamic change. For you requirement you could modify the property of the PrimaryBrush object.
(App.Current.Resources["PrimaryBrush"]as SolidColorBrush).Color = Colors.Red;