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  • 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     }
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  • 原文地址:https://www.cnblogs.com/CodeBase/p/3150716.html
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