93 lines
3.1 KiB
C#
93 lines
3.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Web;
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using System.Web.Caching;
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namespace Epost.Common
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{
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public class CacheHelper
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{
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/// <summary>
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/// 创建缓存项的文件
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <param name="obj">object对象</param>
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public static void Insert(string key, object obj)
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{
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//创建缓存
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//HttpContext.Current.Cache.Insert(key, obj);
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HttpRuntime.Cache.Insert(key, obj);
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}
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/// <summary>
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/// 移除缓存项的文件
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/// </summary>
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/// <param name="key">缓存Key</param>
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public static void Remove(string key)
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{
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//创建缓存
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// HttpContext.Current.Cache.Remove(key);
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HttpRuntime.Cache.Remove(key);
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}
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/// <summary>
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/// 创建缓存项的文件依赖
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <param name="obj">object对象</param>
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/// <param name="fileName">文件绝对路径</param>
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public static void Insert(string key, object obj, string fileName)
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{
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//创建缓存依赖项
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CacheDependency dep = new CacheDependency(fileName);
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//创建缓存
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// HttpContext.Current.Cache.Insert(key, obj, dep);
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HttpRuntime.Cache.Insert(key, obj, dep);
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}
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/// <summary>
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/// 创建缓存项过期
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <param name="obj">object对象</param>
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/// <param name="expires">过期时间(分钟)</param>
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public static void Insert(string key, object obj, int expires)
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{
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//绝对过期：到了指定时间以后便会失效。
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// HttpContext.Current.Cache.Insert(key, obj, null, DateTime.Now.AddMinutes(expires), System.Web.Caching.Cache.NoSlidingExpiration);
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HttpRuntime.Cache.Insert(key, obj, null, DateTime.Now.AddMinutes(expires), System.Web.Caching.Cache.NoSlidingExpiration);
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//滑动过期：在指定时间内无访问请求便失效。
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//HttpContext.Current.Cache.Insert(key, obj, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, expires, 0));
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}
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/// <summary>
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/// 获取缓存对象
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <returns>object对象</returns>
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public static object Get(string key)
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{
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if (string.IsNullOrEmpty(key))
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{
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return null;
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}
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// return HttpContext.Current.Cache.Get(key);
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return HttpRuntime.Cache.Get(key);
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}
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/// <summary>
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/// 获取缓存对象
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/// </summary>
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/// <typeparam name="T">T对象</typeparam>
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/// <param name="key">缓存Key</param>
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/// <returns></returns>
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public static T Get<T>(string key)
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{
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object obj = Get(key);
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return obj == null ? default(T) : (T)obj;
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}
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}
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}
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