ParseRating -> TryParseRating

Program.cs

@@ -166,7 +166,7 @@ public class Photo {
 
   public async void Load() {
     image = await Image.LoadAsync<Rgba32>(File);
-    ParseRating(image);
+    TryParseRating(image.Metadata.XmpProfile, out Rating);
     ExifProfile? exifs = image.Metadata.ExifProfile;
     if (exifs != null) {
       // FIXME: handle Orientation
@@ -240,27 +240,27 @@ public class Photo {
     }
   }
 
-  private void ParseRating(Image image) {
-    XmpProfile? xmp = image.Metadata.XmpProfile;
+  private bool TryParseRating(XmpProfile? xmp, out int rating) {
+    rating = 0;
     if (xmp == null) {
-      return;
+      return false;
     }
     XDocument? doc = xmp.GetDocument();
     if (doc == null) {
-      return;
+      return false;
     }
     XElement? root = doc.Root;
     if (root == null) {
-      return;
+      return false;
     }
     foreach (XElement elt in root.Descendants()) {
       if (elt.Name == "{http://ns.adobe.com/xap/1.0/}Rating") {
-        int rating;
         if (int.TryParse(elt.Value, out rating)) {
-          Rating = rating;
+          return true;
         }
       }
     }
+    return false;
   }
 
   public Texture Texture() {