1using System;
 2using System.Configuration;
 3using System.Reflection;
 4using System.Web;
 5using System.Web.Caching;
 6
 7namespace NBBS.Factory
 8...{
 9    /**//// <summary>
10    /// 依赖注入提供者
11    /// 使用反射机制实现
12    /// </summary>
13    public sealed class DependencyProvider
14    ...{
15        /**//// <summary>
16        /// 取得数据访问层对象
17        /// 首先检查缓存中是否存在，如果不存在，则利用反射机制返回对象
18        /// </summary>
19        /// <param name="className">数据访问类名称</param>
20        /// <returns>数据访问层对象</returns>
21        public static object GetDALObject(string className)
22        ...{
23            /**//// <summary>
24            /// 取得数据访问层名称，首先检查缓存，不存在则到配置文件中读取
25            /// 缓存依赖项为Web.Config文件
26            /// </summary>
27            object dal = CacheAccess.GetFromCache("DAL");
28            if (dal == null)
29            ...{
30                CacheDependency fileDependency = new CacheDependency(HttpContext.Current.Server.MapPath("Web.Config"));
31                dal = ConfigurationManager.AppSettings["DAL"];
32                CacheAccess.SaveToCache("DAL", dal, fileDependency);
33            }
34
35            string dalName = (string)dal;
36
37            /**//// <summary>
38            /// 取得数据访问层对象，首先检查缓存，不存在则利用反射机制加载
39            /// 缓存依赖项为Web.Config文件
40            /// </summary>
41            string fullClassName = dalName + "." + className;
42            object dalObject = CacheAccess.GetFromCache(className);
43            if (dalObject == null)
44            ...{
45                CacheDependency fileDependency = new CacheDependency(HttpContext.Current.Server.MapPath("Web.Config"));
46                dalObject = Assembly.Load(dalName).CreateInstance(fullClassName);
47                CacheAccess.SaveToCache(className, dalObject, fileDependency);
48            }
49
50            return dalObject;
51        }
52
53        /**//// <summary>
54        /// 取得业务逻辑层对象
55        /// 首先检查缓存中是否存在，如果不存在，则利用反射机制返回对象
56        /// </summary>
57        /// <param name="className">业务逻辑类名称</param>
58        /// <returns>业务逻辑层对象</returns>
59        public static object GetBLLObject(string className)
60        ...{
61            /**//// <summary>
62            /// 取得业务逻辑层名称，首先检查缓存，不存在则到配置文件中读取
63            /// 缓存依赖项为Web.Config文件
64            /// </summary>
65            object bll = CacheAccess.GetFromCache("BLL");
66            if (bll == null)
67            ...{
68                CacheDependency fileDependency = new CacheDependency(HttpContext.Current.Server.MapPath("Web.Config"));
69                bll = ConfigurationManager.AppSettings["BLL"];
70                CacheAccess.SaveToCache("BLL", bll, fileDependency);
71            }
72
73            string bllName = (string)bll;
74
75            /**//// <summary>
76            /// 取得业务逻辑层对象，首先检查缓存，不存在则利用反射机制加载
77            /// 缓存依赖项为Web.Config文件
78            /// </summary>
79            string fullClassName = bllName + "." + className;
80            object bllObject = CacheAccess.GetFromCache(className);
81            if (bllObject == null)
82            ...{
83                CacheDependency fileDependency = new CacheDependency(HttpContext.Current.Server.MapPath("Web.Config"));
84                bllObject = Assembly.Load(bllName).CreateInstance(fullClassName);
85                CacheAccess.SaveToCache(className, bllObject, fileDependency);
86            }
87
88            return bllObject;
89        }
90    }
91}
92