Theme aware brush

[melsawy93]

Is there a way to create a brush that has different colors in light theme vs dark theme? I know MDIX does this internally but how can I add a brush to the light and dark theme?

Would it be something like this when I am changing themes or is there a better way to do this?

// Remove the existing custom theme dictionary
    var existingCustomDictionary = Application.Current.Resources.MergedDictionaries
        .FirstOrDefault(d => d.Source != null && 
                             (d.Source.ToString().Contains("CustomLightTheme.xaml") || 
                              d.Source.ToString().Contains("CustomDarkTheme.xaml")));

    if (existingCustomDictionary != null)
    {
        Application.Current.Resources.MergedDictionaries.Remove(existingCustomDictionary);
    }

    // Add the new custom theme dictionary
    var newCustomDictionary = new ResourceDictionary() { Source = new Uri(customThemeResourcePath, UriKind.RelativeOrAbsolute) };
    Application.Current.Resources.MergedDictionaries.Add(newCustomDictionary);