asp.net中缓存类DataCache（依赖文件缓存和时间缓存，或两者）

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using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.Caching;
using System.IO;
namespace Tools.Web
{
/// <summary>
/// 网页中的缓存类,使用示例：
/// object obj = DataCache.GetCache("file1",depfile);
///if (obj == null)
///{
/// string txt = "缓存内容";//从数据库或文件读取到的内容
/// DataCache.SetCacheDepFile("file1", txt, depfile);
/// }
/// else
/// {
/// string txt=obj.ToString();
/// }
/// </summary>
public partial class DataCache
{
#region 文件路径web.config
private static string _webconfigfile = string.Empty;
/// <summary>
/// 文件路径web.config
/// </summary>
public static string webconfigfile
{
get
{
if (string.IsNullOrEmpty(_webconfigfile)) _webconfigfile = HttpContext.Current.Server.MapPath("/web.config");
return _webconfigfile;
}
}
#endregion
#region 文件路径App_Data/ShopConfig.config
private static string _shopconfigfile = string.Empty;
/// <summary>
/// 文件路径App_Data/ShopConfig.config
/// </summary>
public static string shopconfigfile
{
get
{
if (string.IsNullOrEmpty(_shopconfigfile)) _shopconfigfile = HttpContext.Current.Server.MapPath("/App_Data/ShopConfig.config");
return _shopconfigfile;
}
}
#endregion
#region 文件路径App_Data/SiteConfig.config
private static string _siteconfigfile = string.Empty;
/// <summary>
/// 文件路径App_Data/SiteConfig.config
/// </summary>
public static string siteconfigfile
{
get
{
if (string.IsNullOrEmpty(_siteconfigfile)) _siteconfigfile = HttpContext.Current.Server.MapPath("/App_Data/SiteConfig.config");
return _siteconfigfile;
}
}
#endregion
#region 文件路径App_Data/Template.config
private static string _templateconfigfile = string.Empty;
/// <summary>
/// 文件路径App_Data/Template.config
/// </summary>
public static string templateconfigfile
{
get
{
if (string.IsNullOrEmpty(_templateconfigfile)) _templateconfigfile = HttpContext.Current.Server.MapPath("/App_Data/Template.config");
return _templateconfigfile;
}
}
#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，依赖时间
/// <summary>
/// 获取缓存，依赖时间
/// </summary>
/// <param name="CacheKey">键</param>
/// <returns></returns>
public static object GetCache(string CacheKey)
{
object obj_time=HttpRuntime.Cache[CacheKey + "_time"];
object obj_cache=HttpRuntime.Cache[CacheKey];
if (obj_time != null && obj_cache!=null)
{
if (Convert.ToDateTime(obj_time) < DateTime.Now)
{
DeleteCache(CacheKey);
DeleteCache(CacheKey + "_time");
return null;
}
else return obj_cache;
}
else
{
DeleteCache(CacheKey);
DeleteCache(CacheKey+"_time");
return null;
}
}
#endregion
#region 获取缓存，依赖文件
/// <summary>
/// 获取缓存，依赖文件
/// </summary>
/// <param name="CacheKey">键</param>
/// <param name="depFile">依赖的文件</param>
/// <returns></returns>
public static object GetCache(string CacheKey, string depFile)
{
object obj_time = HttpRuntime.Cache[CacheKey + "_time"];
object obj_cache = HttpRuntime.Cache[CacheKey];
if (File.Exists(depFile))
{
FileInfo fi = new FileInfo(depFile);
if (obj_time != null && obj_cache != null)
{
if (Convert.ToDateTime(obj_time) != fi.LastWriteTime)
{
DeleteCache(CacheKey);
DeleteCache(CacheKey + "_time");
return null;
}
else return obj_cache;
}
else
{
DeleteCache(CacheKey);
DeleteCache(CacheKey + "_time");
return null;
}
}
else
{
throw new Exception("文件(" + depFile + ")不存在！");
}
}
#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);
HttpRuntime.Cache.Insert(CacheKey + "_time", absoluteExpiration, null, absoluteExpiration, slidingExpiration);//存储过期时间
}
#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);
HttpRuntime.Cache.Insert(CacheKey + "_time", absoluteExpiration, null, absoluteExpiration, slidingExpiration);//存储过期时间
}
#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);
DateTime absoluteExpiration = System.Web.Caching.Cache.NoAbsoluteExpiration;
TimeSpan slidingExpiration=System.Web.Caching.Cache.NoSlidingExpiration;
System.Web.Caching.Cache objCache = HttpRuntime.Cache;
objCache.Insert(
CacheKey,
objObject,
dep,
System.Web.Caching.Cache.NoAbsoluteExpiration, //从不过期
slidingExpiration, //禁用可调过期
System.Web.Caching.CacheItemPriority.Default,
null);
if (File.Exists(depfilename))
{
FileInfo fi = new FileInfo(depfilename);
DateTime lastWriteTime = fi.LastWriteTime;
HttpRuntime.Cache.Insert(CacheKey + "_time", lastWriteTime, null, absoluteExpiration, slidingExpiration);//存储文件最后修改时间
}
}
#endregion
}
}

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