asp.net中缓存类DataCache（依赖文件缓存和时间缓存，或两者）
/// <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
}