asp.net中缓存类DataCache（依赖文件缓存和时间缓存，或两者）

[csharp] 

/// <summary>  

/// 数据缓存类  

/// </summary>  

public class datacache  

{  

 

    #region 缓存依赖文件web.config  

    private static string _webconfigfile = string.empty;  

    /// <summary>  

    /// 缓存依赖文件web.config  

    /// </summary>  

    public static string webconfigfile  

    {  

        get  

        {  

            if (_webconfigfile == string.empty) _webconfigfile = httpcontext.current.server.mappath("/web.config");  

            return _webconfigfile;  

        }  

    }   

    #endregion  

 

    #region 删除缓存  

    /// <summary>  

    /// 删除缓存  

    /// </summary>  

    /// <param name="cachekey">键</param>  

    public static void deletecache(string cachekey)  

    {  

        httpruntime.cache.remove(cachekey);  

    }   

    #endregion  

 

    #region 获取缓存  

    /// <summary>  

    /// 获取缓存  

    /// </summary>  

    /// <param name="cachekey">键</param>  

    /// <returns></returns>  

    public static object getcache(string cachekey)  

    {  

        return httpruntime.cache[cachekey];  

    }   

    #endregion  

 

    #region 简单的插入缓存  

    /// <summary>  

    /// 简单的插入缓存  

    /// </summary>  

    /// <param name="cachekey">键</param>  

    /// <param name="objobject">数据</param>  

    public static void setcache(string cachekey, object objobject)  

    {  

        httpruntime.cache.insert(cachekey, objobject);  

    }   

    #endregion  

 

    #region 有过期时间的插入缓存数据  

    /// <summary>  

    /// 有过期时间的插入缓存数据  

    /// </summary>  

    /// <param name="cachekey">键</param>  

    /// <param name="objobject">数据</param>  

    /// <param name="absoluteexpiration">过期时间</param>  

    /// <param name="slidingexpiration">可调度参数，传null就是禁用可调度</param>  

    public static void setcache(string cachekey, object objobject, datetime absoluteexpiration, timespan slidingexpiration)  

    {  

        if (slidingexpiration == null) slidingexpiration = cache.noslidingexpiration;  

        httpruntime.cache.insert(cachekey, objobject, null, absoluteexpiration, slidingexpiration);  

    }   

    #endregion  

 

    #region 插入缓存数据，指定缓存多少秒  

    /// <summary>  

    /// 插入缓存数据，指定缓存多少秒  

    /// </summary>  

    /// <param name="cachekey">缓存的键</param>  

    /// <param name="objobject">缓存的数据</param>  

    /// <param name="seconds">缓存秒数</param>  

    /// <param name="slidingexpiration">传null就是禁用可调度过期</param>  

    public static void setcachesecond(string cachekey, object objobject, int seconds, timespan slidingexpiration)  

    {  

        datetime absoluteexpiration = datetime.now.addseconds(seconds);  

        if (slidingexpiration == null) slidingexpiration = cache.noslidingexpiration;  

        httpruntime.cache.insert(cachekey, objobject, null, absoluteexpiration, slidingexpiration);  

    }   

    #endregion  

 

    #region 依赖文件的缓存，文件没改不会过期  

    /// <summary>  

    /// 依赖文件的缓存，文件没改不会过期  

    /// </summary>  

    /// <param name="cachekey">键</param>  

    /// <param name="objobject">数据</param>  

    /// <param name="depfilename">依赖文件，可调用 datacache 里的变量</param>  

    public static void setcachedepfile(string cachekey, object objobject, string depfilename)  

    {  

        //缓存依赖对象  

        system.web.caching.cachedependency dep = new system.web.caching.cachedependency(depfilename);  

        system.web.caching.cache objcache = httpruntime.cache;  

        objcache.insert(  

            cachekey,  

            objobject,  

            dep,  

            system.web.caching.cache.noabsoluteexpiration, //从不过期  

            system.web.caching.cache.noslidingexpiration, //禁用可调过期  

            system.web.caching.cacheitempriority.default,  

            null);  

    }   

    #endregion  

  

}