C#缓存-依赖 CacheHelper

缓存依赖文件或文件夹

//创建缓存依赖项

CacheDependency dep = new CacheDependency(fileName);//Server.MapPath("");

//创建缓存

HttpRuntime.Cache.Insert(key, obj, dep);

fileName:可以是文件或者文件夹目录

若fileName是文件，则你创建的缓存依赖该文件，该文件若更改，则缓存更新。

若fileName是一个文件夹目录，则缓存依赖该文件夹，该文件夹跟目录下的文件若有变动，则缓存更新。

 

缓存依赖多个文件或文件夹

CacheDependency dep1 = new CacheDependency(fileName1); 
CacheDependency dep2 = new CacheDependency(fileName2);
CacheDependency[] deps = new CacheDependency[] { dep1, dep2 };
AggregateCacheDependency mulDep = new AggregateCacheDependency(); //多个依赖项
mulDep.Add(deps);
HttpRuntime.Cache.Insert(key, obj, mulDep);

 

MVC缓存

[OutputCache(Duration = 20)]

 

MVC数据库依赖缓存

 

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<connectionStrings>        <add name="Am_WeixinWeb" connectionString="data source=192.168.1.200;initial catalog=Am_WeixinWeb;uid=sa;password=lh1234;"  /> </connectionStrings>

 

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<caching>       <sqlCacheDependency enabled="true" pollTime="2000">         <databases>           <add name="Test" connectionStringName="Am_WeixinWeb" />         </databases>       </sqlCacheDependency> </caching>

注：pollTime，毫秒为单位，意识是每隔2秒检测下数据库，检测表是否有发生变化。connectionStringName为数据库链接字符串。

 

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//mvc缓存依赖         [OutputCache(Duration = 20, SqlDependency = "Test:Am_recProScheme")] //Test:为缓存配置的key，后面跟的是缓存依赖表         public ActionResult Index()         {                       Response.Write(db.Am_recProScheme.FirstOrDefault().recContent);             return View();         }

效果：数据库Am_WeixinWeb中表Am_recProScheme中的数据有所变动，则清空缓存，重新写入。

 

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Web.Caching; using System.Web;   namespace Framework.Common {     /// <summary>     /// 缓存辅助类     /// </summary>     public class CacheHelper     {         /// <summary>         /// 创建缓存项的文件依赖         /// </summary>         /// <param name="key">缓存Key</param>         /// <param name="obj">object对象</param>         /// <param name="fileName">文件绝对路径</param>         public static void Insert(string key, object obj, string fileName)         {             //创建缓存依赖项             CacheDependency dep = new CacheDependency(fileName);             //创建缓存             HttpRuntime.Cache.Insert(key, obj, dep);         }           /// <summary>         /// 创建缓存项过期         /// </summary>         /// <param name="key">缓存Key</param>         /// <param name="obj">object对象</param>         /// <param name="expires">过期时间(分钟)</param>         public static void Insert(string key, object obj, int expires)         {             if (string.IsNullOrEmpty(key) || obj == null)             {                 return;             }             HttpRuntime.Cache.Insert(key, obj, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, expires, 0));         }           /// <summary>         /// 获取缓存对象         /// </summary>         /// <param name="key">缓存Key</param>         /// <returns>object对象</returns>         public static object Get(string key)         {             if (string.IsNullOrEmpty(key))             {                 return null;             }             return HttpRuntime.Cache.Get(key);         }           /// <summary>         /// 获取缓存对象         /// </summary>         /// <typeparam name="T">T对象</typeparam>         /// <param name="key">缓存Key</param>         /// <returns></returns>         public static T Get<T>(string key)         {             object obj = Get(key);             return obj == null ? default(T) : (T)obj;         }     } }

　　

参考：http://www.cnblogs.com/knowledgesea/p/3904929.html