Merge pull request #1082 from ricaun/patch-2

Update UiApplication.cs

src/Wpf.Ui/UiApplication.cs

@@ -23,7 +23,22 @@ public class UiApplication
     /// </summary>
     public UiApplication(Application application)
     {
+        if (application is null)
+        {
+            return;
+        }
+
+        if (!ApplicationHasResources(application))
+        {
+            return;
+        }
+
         _application = application;
+
+        System.Diagnostics.Debug.WriteLine(
+                $"INFO | {typeof(UiApplication)} application is {_application}",
+                "Wpf.Ui"
+        );
     }
 
     /// <summary>
@@ -111,4 +126,11 @@ public void Shutdown()
     {
         _application?.Shutdown();
     }
+
+    private static bool ApplicationHasResources(Application application)
+    {
+        return application.Resources.MergedDictionaries
+            .Where(e => e.Source is not null)
+            .Any(e => e.Source.ToString().ToLower().Contains(Appearance.ApplicationThemeManager.LibraryNamespace));
+    }
 }