Cnic.CacheHelper<T>

  1     public class UserBLL
  2     {
  3         public class UserInfo
  4         {
  5             public int ID { get; set; }
  6             public string Email { get; set; }
  7             public string UserName { get; set; }
  8         }
  9 
 10         public UserInfo GetModel(int id)
 11         {
 12             return null;//dal.GetModel(id);
 13         }
 14         public UserInfo GetModelByCache(int id)
 15         {
 16             CacheHelper<UserInfo> cacheHelper = new CacheHelper<UserInfo>();
 17             cacheHelper.CacheTime = 10000;
 18             cacheHelper.CacheKey = "Model.UserInfo." + id;
 19             return cacheHelper.GetValue(id, new CacheHelper<UserInfo>.IntHandel(GetModel));
 20         }
 21 
 22         public UserInfo GetModel(string email)
 23         {
 24             return null;//dal.GetModel(email);
 25         }
 26         public UserInfo GetModelByCache(string email)
 27         {
 28             CacheHelper<UserInfo> cacheHelper = new CacheHelper<UserInfo>();
 29             cacheHelper.CacheTime = 10000;
 30             cacheHelper.CacheKey = "Model.UserInfo." + email;
 31             return cacheHelper.GetValue(email, new CacheHelper<UserInfo>.StringHandel(GetModel));
 32         }
 33 
 34         public int Update(UserInfo model)
 35         {
 36             int rtun = 0;//dal.Update(model);
 37             if (rtun > 0)
 38             {
 39                 new CacheHelper<UserInfo>() { CacheKey= "Model.UserInfo." + model.Email }.Remove();
 40                 new CacheHelper<UserInfo>() { CacheKey = "Model.UserInfo." + model.ID }.Remove();
 41             }
 42             return rtun;
 43         }
 44     }
 45 
 46     public class CacheHelper<T>
 47     {
 48         /// <summary>
 49         /// 多长时间没有访问后过期
 50         /// </summary>
 51         /// <param name="key"></param>
 52         /// <param name="value"></param>
 53         /// <param name="time"></param>
 54         public static void Insert(string key, object value, TimeSpan time)
 55         {
 56             if (value != null)
 57             {
 58                 System.Web.HttpRuntime.Cache.Insert(
 59                    key,
 60                    value,
 61                    null,
 62                    System.Web.Caching.Cache.NoAbsoluteExpiration,
 63                    time);
 64             }
 65         }
 66         /// <summary>
 67         /// 指定时间过期
 68         /// </summary>
 69         /// <param name="key"></param>
 70         /// <param name="value"></param>
 71         /// <param name="time">DateTime.UtcNow.AddSeconds(10)</param>
 72         public static void Add(string key, object value, DateTime time)
 73         {
 74             if (value != null)
 75             {
 76                 System.Web.HttpRuntime.Cache.Add(
 77                     key,
 78                     value,
 79                     null,
 80                     time,//10秒
 81                     System.Web.Caching.Cache.NoSlidingExpiration,
 82                     System.Web.Caching.CacheItemPriority.High,
 83                     null);
 84             }
 85         }
 86 
 87         public static object Remove(string key)
 88         {
 89             if (key == null) { return null; }
 90             return System.Web.HttpRuntime.Cache.Remove(key);
 91         }
 92 
 93         public class CacheObject
 94         {
 95             //public bool IsExist { get; set; }
 96             public T Value { get; set; }
 97         }
 98 
 99         public string CacheKey { get; set; }
100         public int CacheTime { get; set; }
101         public IntHandel CacheIntHandel { get; set; }
102         public StringHandel CacheStringHandel { get; set; }
103 
104         public delegate T IntHandel(int id);
105         public delegate T StringHandel(string key);
106 
107 
108         public T GetValue(int id, IntHandel handel)
109         {
110             CacheObject rtun = System.Web.HttpRuntime.Cache[CacheKey] as CacheObject;
111             if (rtun == null)
112             {
113                 rtun = new CacheObject();
114                 rtun.Value = handel(id);
115                 //rtun.IsExist = rtun.Value != null;
116                 Insert(CacheKey, rtun, TimeSpan.FromSeconds(CacheTime));
117             }
118             return rtun.Value;
119         }
120         public T GetValue(string key, StringHandel handel)
121         {
122             CacheObject rtun = System.Web.HttpRuntime.Cache[CacheKey] as CacheObject;
123             if (rtun == null)
124             {
125                 rtun = new CacheObject();
126                 rtun.Value = handel(key);
127                 //rtun.IsExist = rtun.Value != null;
128                 Insert(CacheKey, rtun, TimeSpan.FromSeconds(CacheTime));
129             }
130             return rtun.Value;
131         }
132         public T Remove()
133         {
134             CacheObject rtun = System.Web.HttpRuntime.Cache[CacheKey] as CacheObject;
135             if (rtun == null) { return default(T); }
136             return rtun.Value;
137         }
138     }