Feature load improvement (#374)

* use lambda expression  => improve database call

* use lambda instead  for each replace call to repository to reduce call to database

* improve readability and maintainability, and add order by

* clean semicolon

* fix use correct catalog item id

src/ApplicationCore/Specifications/CatalogItemsSpecification.cs

@@ -0,0 +1,14 @@
+using Microsoft.eShopWeb.ApplicationCore.Entities;
+using System;
+using System.Linq;
+
+namespace Microsoft.eShopWeb.ApplicationCore.Specifications
+{
+    public class CatalogItemsSpecification : BaseSpecification<CatalogItem>
+    {
+        public CatalogItemsSpecification(params int[] ids) : base(c => ids.Contains(c.Id))
+        {
+
+        }
+    }
+}