《.NET应用架构设计：原则、模式与实践》新书博客--试读-2.1.2 设计原则实战

using System;

usingSystem.Collections.Generic;

usingSystem.Web;

using AgileSharp.Chapter2.Repository;

using AgileSharp.Chapter2.Domain;



namespace AgileSharp.Chapter2.Service

{

        public class ProductService

        {

        private ProductRepository productRepository = null;



        public ProductService()

                {

                productRepository = new ProductRepository();

                }



        public List<Product> GetAllProductsFrom(intcategoryId)

                {

                        List<Product> result = new List<Product>();

                try

                        {

                                string cacheKey = string.Format("products_in_category_{0}"，categoryId);

                result = HttpContext.Current.Cache.Get(cacheKey) as List<Product>;



                if (result == null)

                                {

                        result = productRepository.GetProductsFrom(categoryId);

                        if (result != null &&result.Count> 0)

                                            {

                        HttpContext.Current.Cache.Insert(cacheKey， result);

                                            }

                                }

                        }

                catch (Exception ex)

                        {

                                //Log will add here later


                        }

                return result;

                }

        }

}