知识大全 petshop4体现的面向接口编程思想

Posted 2022-07-18 知

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　　petshop 充分体现了面向接口编程的思想就是给你一个接口你别管我是怎么实现的你只管用别说其他的 namespace PetShop BLL /// <summary> /// A business ponent to manage products /// </summary> public class Product // Get an instance of the Product DAL using the DALFactory // Making this static will cache the DAL instance after the initial load private static readonly IProduct dal = PetShop DALFactory DataAccess CreateProduct();

　　在bll层这里使用创建Produce的接口你只管调用他的方法

　　namespace PetShop IDAL /// <summary> /// Interface for the Product DAL /// </summary>

　　public interface IProduct /// <summary> /// Method to search products by category name /// </summary> /// <param name= category >Name of the category to search by</param> /// <returns>Interface to Model Collection Generic of search results</returns> IList<ProductInfo> GetProductsByCategory(string category); /// <summary> /// Method to search products by a set of keyword /// </summary> /// <param name= keywords >An array of keywords to search by</param> /// <returns>Interface to Model Collection Generic of search results</returns> IList<ProductInfo> GetProductsBySearch(string[] keywords); /// <summary> /// Query for a product /// </summary> /// <param name= productId >Product Id</param> /// <returns>Interface to Model ProductInfo for requested product</returns> ProductInfo GetProduct(string productId);

　　这里是定义了Product接口和他的虚方法 namespace PetShop SQLServerDAL public class Product : IProduct //Static constants private const string SQL_SELECT_PRODUCTS_BY_CATEGORY = SELECT Product ProductId Product Name Product Descn Product Image Product CategoryId FROM Product WHERE Product CategoryId = @Category ; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = SELECT ProductId Name Descn Product Image Product CategoryId FROM Product WHERE (( ; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = LOWER(Name) LIKE % + + % OR LOWER(CategoryId) LIKE % + + % ; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = ) OR ( ; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = )) ; private const string SQL_SELECT_PRODUCT = SELECT Product ProductId Product Name Product Descn Product Image Product CategoryId FROM Product WHERE Product ProductId = @ProductId ; private const string PARM_CATEGORY = @Category ; private const string PARM_KEYWORD = @Keyword ; private const string Parm_PRODUCTID = @ProductId ; /// <summary> /// Query for products by category /// </summary> /// <param name= category >category name</param> /// <returns>A Generic List of ProductInfo</returns> public IList<ProductInfo> GetProductsByCategory(string category) IList<ProductInfo> productsByCategory = new List<ProductInfo>();

　　这里是实现Product接口的类 namespace PetShop DALFactory /// <summary> /// This class is implemented following the Abstract Factory pattern to create the DAL implementation /// specified from the configuration file /// </summary> public sealed class DataAccess // Look up the DAL implementation we should be using private static readonly string path = ConfigurationManager AppSettings[ WebDAL ]; private static readonly string orderPath = ConfigurationManager AppSettings[ OrdersDAL ]; private DataAccess() public static PetShop IDAL ICategory CreateCategory() string className = path + Category ; return (PetShop IDAL ICategory)Assembly Load(path) CreateInstance(className);

　　这里是利用工厂模式来映射你需要你想创建哪一个

　　后面还有一些消息队列MSMQMessage利用cache缓存以后达到异步处理购物车里订单的功能！

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