.NET Cache公共类

using System; using System.Collections; using System.Web; using System.Web.Caching; namespace WebApi.Shared { /// <summary> /// HttpRuntime Cache读取设置缓存信息封装 /// <auther> /// <name>Kencery</name> /// <date>2015-8-11</date> /// </auther> /// 使用描述：给缓存赋值使用HttpRuntimeCache.Set(key,value....)等参数(第三个参数可以传递文件的路径(HttpContext.Current.Server.MapPath())) /// 读取缓存中的值使用JObject jObject=HttpRuntimeCache.Get(key) as JObject，读取到值之后就可以进行一系列判断 /// </summary> public class CacheHelper { /// <summary> /// 设置缓存时间，配置(从配置文件中读取) /// </summary> private const double Seconds = 20 * 60; /// <summary> /// 缓存指定对象，设置缓存 /// </summary> public static bool Set(string key, object value) { return Set(key, value, null, DateTime.Now.AddSeconds(Seconds), Cache.NoSlidingExpiration, CacheItemPriority.Default, null); } /// <summary> /// 缓存指定对象，设置缓存 /// </summary> public static bool Set(string key, object value, string path) { try { var cacheDependency = new CacheDependency(path); return Set(key, value, cacheDependency); } catch { return false; } } /// <summary> /// 缓存指定对象，设置缓存 /// </summary> public static bool Set(string key, object value, CacheDependency cacheDependency) { return Set(key, value, cacheDependency, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, CacheItemPriority.Default, null); } /// <summary> /// 缓存指定对象，设置缓存 /// </summary> public static bool Set(string key, object value, double seconds, bool isAbsulute) { return Set(key, value, null, (isAbsulute ? DateTime.Now.AddSeconds(seconds) : Cache.NoAbsoluteExpiration), (isAbsulute ? Cache.NoSlidingExpiration : TimeSpan.FromSeconds(seconds)), CacheItemPriority.Default, null); } /// <summary> /// 获取缓存对象 /// </summary> public static object Get(string key) { return GetPrivate(key); } /// <summary> /// 判断缓存中是否含有缓存该键 /// </summary> public static bool Exists(string key) { return (GetPrivate(key) != null); } /// <summary> /// 移除缓存对象 /// </summary> /// <param name="key"></param> /// <returns></returns> public static bool Remove(string key) { if (string.IsNullOrEmpty(key)) { return false; } HttpRuntime.Cache.Remove(key); return true; } /// <summary> /// 移除所有缓存 /// </summary> /// <returns></returns> public static bool RemoveAll() { IDictionaryEnumerator iDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator(); while (iDictionaryEnumerator.MoveNext()) { HttpRuntime.Cache.Remove(Convert.ToString(iDictionaryEnumerator.Key)); } return true; } //------------------------提供给上面方法进行调用----------------------------------- /// <summary> /// 设置缓存 /// </summary> public static bool Set(string key, object value, CacheDependency cacheDependency, DateTime dateTime, TimeSpan timeSpan, CacheItemPriority cacheItemPriority, CacheItemRemovedCallback cacheItemRemovedCallback) { if (string.IsNullOrEmpty(key) || value == null) { return false; } HttpRuntime.Cache.Insert(key, value, cacheDependency, dateTime, timeSpan, cacheItemPriority, cacheItemRemovedCallback); return true; } /// <summary> /// 获取缓存 /// </summary> private static object GetPrivate(string key) { return string.IsNullOrEmpty(key) ? null : HttpRuntime.Cache.Get(key); } } }