继续优化读单

AllBase/ImageBuild.cs

@@ -386,7 +386,7 @@ namespace AllBase
             }
         }
 
-        public static BitmapImage LoadBitmipImageFromUrl(string url, int? width = 0, int? height = 0)
+        public static BitmapImage LoadBitmipImageFromUrl(string url, int? width = null, int? height = null)
         {
             BitmapImage bitmap = new BitmapImage();