FoodOrders/FoodOrdersFileImplement/Implements/ShopStorage.cs

@@ -85,12 +85,20 @@ namespace FoodOrdersFileImplement.Implements
         {
             var dish = source.Dishs.FirstOrDefault(x => x.Id == model.Id);
 
-            int countStore = source.Shops
-                .SelectMany(x => x.ShopDishs)
-                .Where(y => y.Key == model.Id)
-                .Sum(y => y.Value.Item2);
+            if (dish == null)
+            {
+                return false;
+            }
 
-            if (dish == null || count > countStore)
+
+            var shopDishs = source.Shops.SelectMany(shop => shop.ShopDishs.Where(c => c.Value.Item1.Id == dish.Id));
+
+            int countStore = 0;
+
+            foreach (var it in shopDishs)
+                countStore += it.Value.Item2;
+
+            if (count > countStore)
                 return false;
 
             foreach (var shop in source.Shops)