【转】缓存操作类

 1using System;
 2using System.Collections.Generic;
 3using System.Text;
 4using System.Web.Caching;
 5using System.Web;
 6
 7namespace Koyee.Common
 8{
 9    public class CacheHelp
10    {
11
12        /**//// 简单创建/修改Cache，前提是这个值是字符串形式的
13        /// <summary>
14        /// 简单创建/修改Cache，前提是这个值是字符串形式的
15        /// </summary>
16        /// <param name="strCacheName">Cache名称</param>
17        /// <param name="strValue">Cache值</param>
18        /// <param name="iExpires">有效期，秒数（使用的是当前时间+秒数得到一个绝对到期值）</param>
19        /// <param name="priority">保留优先级，1最不会被清除，6最容易被内存管理清除（1:NotRemovable；2:High；3:AboveNormal；4:Normal；5:BelowNormal；6:Low）</param>
20        public static void Insert(string strCacheName, object strValue, int iExpires, int priority)
21        {
22            //TimeSpan ts = new TimeSpan(0, 0, iExpires);
23            CacheItemPriority cachePriority;
24            switch (priority)
25            {
26                case 6:
27                    cachePriority = CacheItemPriority.Low;
28                    break;
29                case 5:
30                    cachePriority = CacheItemPriority.BelowNormal;
31                    break;
32                case 4:
33                    cachePriority = CacheItemPriority.Normal;
34                    break;
35                case 3:
36                    cachePriority = CacheItemPriority.AboveNormal;
37                    break;
38                case 2:
39                    cachePriority = CacheItemPriority.High;
40                    break;
41                case 1:
42                    cachePriority = CacheItemPriority.NotRemovable;
43                    break;
44                default:
45                    cachePriority = CacheItemPriority.Default;
46                    break;
47            }
48            HttpContext.Current.Cache.Insert(strCacheName, strValue, null, DateTime.Now.AddHours(iExpires), System.Web.Caching.Cache.NoSlidingExpiration, cachePriority, null);
49        }
50
51        /**//// 简单读书Cache对象的值
52        /// <summary>
53        /// 简单读书Cache对象的值
54        /// </summary>
55        /// <param name="strCacheName">Cache名称</param>
56        /// <returns>Cache字符串值</returns>
57        public static object Get(string strCacheName)
58        {
59            if (HttpContext.Current.Cache[strCacheName] == null)
60            {
61                return null;
62            }
63            return HttpContext.Current.Cache[strCacheName];
64        }
65
66        /**//// 删除Cache对象
67        /// <summary>
68        /// 删除Cache对象
69        /// </summary>
70        /// <param name="strCacheName">Cache名称</param>
71        public static void Del(string strCacheName)
72        {
73            HttpContext.Current.Cache.Remove(strCacheName);
74        }
75
76    }
77}

以上就是缓存操作类，需要声明的一点就是，这里把缓存时间默认为了以小时为单位，这是酷易商城系统决定的。
通过以上静态方法就可以非常方便的进行缓存操作，首先看一下首页商品列表的缓存加载，
调用方法下：
protected void StartLoad(int PageIndex, Repeater rep, string strWhere, string ClassID, string type, int count)
        {
            string cacheName = listcacheName + type;
            if (CacheHelp.Get(cacheName) == null)
            {
                DataTable data;
                //此处为信息查询
                CacheHelp.Insert(cacheName, data, 300, 3);//把查询数据输入到缓存中
            }
            rep.DataSource = CacheHelp.Get(cacheName) as DataTable;
            //设置数据源
            rep.DataBind();
        }