C＃如何保持數據本地，而不是從數據庫中加載數據多次？

Question

我有一個保存功能和刷新功能。保存調用刷新功能。 保存需要4'756ms，刷新需要4'187ms - >保存不刷新需要569ms。 在刷新功能中，它將重新加載數據庫中的數據。 我怎樣才能保存我的數據本地，但保存到數據庫的更改，以便我有多次不加載數據庫中的數據？

我使用實體框架5並使用存儲庫。

謝謝。

Answer 1

您可以使用緩存像HttpContext.Current.Cache：

internal static class Cache<T> 
    { 
     public static void Save(IList<T> list, int insertAt, string cacheKey) 
     { 
     // Cache key per Session 
     cacheKey = HttpContext.Current.Session.SessionID + "~" + cacheKey; 

     if (list != null && list.Count > 0) 
     { 
      // if list is already there, insert items in list. 
      IList<T> cachedList = HttpContext.Current.Cache[cacheKey] as IList<T>; 
      if (cachedList != null) 
      { 
       // remove list from cache. 
       HttpContext.Current.Cache.Remove(cacheKey); 

       // insert items at position. 
       if (insertAt < 0) 
       { 
        insertAt = cachedList.Count; 
       } 
       foreach (T item in list) 
       { 
        cachedList.Insert(insertAt, item); 
        insertAt++; 
       } 
      } 
      else 
      { 
       // check that list is no array, because that cannot be removed. 
       cachedList = list.GetType().IsArray ? new List<T>(list) : list; 
      } 

      // save list in cache for 30 seconds. 
      HttpContext.Current.Cache.Insert(
              cacheKey 
              , cachedList 
              , null 
              , DateTime.Now.AddSeconds(30) 
              , Cache.NoSlidingExpiration 
              ); 
     } 
     } 

     public static void Save(IList<T> list, string cacheKey) 
     { 
     Save(list, -1, cacheKey); 
     } 
     public static void Save(IList<T> list, int insertAt) 
     { 
     Save(list, insertAt, typeof(T).Name); 
     } 

     public static int Remove(T item, string cacheKey) 
     { 
     // index of removed item. 
     int removedIndex = -1; 
     // cache key per Session 
     cacheKey = HttpContext.Current.Session.SessionID + "~" + cacheKey; 

     if (item != null) 
     { 
      // remove from cache. 
      IList<T> cachedList = HttpContext.Current.Cache[cacheKey] as IList<T>; 
      if (cachedList != null) 
      { 
       // remove list from cache. 
       HttpContext.Current.Cache.Remove(cacheKey); 

       // remove item from cached list.. 
       removedIndex = cachedList.IndexOf(item); 
       cachedList.Remove(item); 

       // insert list for 30 sec. 
       HttpContext.Current.Cache.Insert(
               cacheKey 
              , cachedList 
              , null 
              , DateTime.Now.AddSeconds(30) 
              , Cache.NoSlidingExpiration 
               ); 
      } 
     } 
     return removedIndex; 
     } 

     public static int Remove(T item) 
     { 
     return Remove(item, typeof(T).Name); 
     } 

     public static void Clear(string cacheKey) 
     { 
     // cache Key per Session 
     cacheKey = HttpContext.Current.Session.SessionID + "~" + cacheKey; 

     HttpContext.Current.Cache.Remove(cacheKey); 
     } 

     public static void Clear() 
     { 
     Clear(typeof(T).Name); 
     } 

}