Added RegistryKeyExtensions

NotificationFlyout.Wpf.UI/Extensions/RegistryKeyExtensions.cs

@@ -0,0 +1,12 @@
+using Microsoft.Win32;
+
+namespace NotificationFlyout.Wpf.UI.Extensions
+{
+    public static class RegistryKeyExtensions
+    {
+        public static T GetValue<T>(this RegistryKey key, string valueName, T defaultValue = default)
+        {
+            return string.IsNullOrWhiteSpace(valueName) ? defaultValue : key.GetValue(valueName, defaultValue) is T value ? value : defaultValue;
+        }
+    }
+}

NotificationFlyout.Wpf.UI/Helpers/SystemPersonalisationHelper.cs

@@ -37,8 +37,8 @@ namespace NotificationFlyout.Wpf.UI.Helpers
 
         private SystemTheme GetSystemTheme()
         {
-            var uiTheme = _settings.GetColorValue(UIColorType.Background).ToString();
+            var color = _settings.GetColorValue(UIColorType.Background).ToString();
-            return uiTheme == "#FFFFFFFF" ? SystemTheme.Light : SystemTheme.Dark;
+            return color == "#FFFFFFFF" ? SystemTheme.Light : SystemTheme.Dark;
         }
 
         private void OnColorValuesChanged(UISettings sender, object args)