Asp.net通用的应用程序缓存方法

/*********************************************************
 * 创 建 人：事理
 * 创建时间：2012-09-03 11:56
 * 版权所有：Copyright © 
 * 描    述：通用应用程序缓存辅助类
 * *******************************************************/
using System;
using System.Data;
using System.Web;
using System.Collections.Generic;

public static class CacheHelper
{
    public delegate T GetDataMethod<T>();//获取数据的方法

    /// <summary>
    /// 通用应用程序缓存方法,缓存数据未指定时间
    /// </summary>
    /// <typeparam name="T">缓存数据的类型，一般是集合，如IList&lt;UsersData&gt;</typeparam>
    /// <param name="key">键</param>
    /// <param name="cacheTimeout">缓存时间，分钟单位</param>
    /// <param name="getDataMethod">获取数据的方法</param>
    /// <returns>数据列表</returns>
    public static T GetCache<T>(string key, DateTime cacheTimeout, GetDataMethod<T> getDataMethod)
    {
        //T dataList = getDataMethod();
        //return dataList;

        if (HttpRuntime.Cache[key] == null)
        {
            T dataList = getDataMethod();
            HttpRuntime.Cache.Add(key, dataList, null, cacheTimeout,
                TimeSpan.Zero, System.Web.Caching.CacheItemPriority.High, null);
            return dataList;
        }
        return (T)HttpRuntime.Cache[key];
    }

    /// <summary>
    /// 移除应用程序缓存
    /// </summary>
    /// <param name="key">键</param>
    public static void RemoveCacheByKey(string key)
    {
        HttpRuntime.Cache.Remove(key);
    }

    /// <summary>
    /// 移除Key相似的缓存
    /// </summary>
    /// <param name="similarKey">key相似的部分</param>
    public static void RemoveCacheBySimilarKey(string similarKey)
    {
        System.Collections.IDictionaryEnumerator cacheEnum = HttpRuntime.Cache.GetEnumerator();
        List<string> keys = new List<string>();
        while (cacheEnum.MoveNext())
        {
            if (cacheEnum.Key.ToString().Contains(similarKey))
                keys.Add(cacheEnum.Key.ToString());
        }
        for (int i = 0; i < keys.Count; i++)
        {
            HttpRuntime.Cache.Remove(keys[i]);
        }
    }
}

//使用示例
rptTop.DataSource = CacheHelper.GetCache("Menu", new CacheHelper.GetDataMethod<IList<PlateData>>(
　　delegate() { return PlateBll.GetAllByPlateType(new int[] { 1 }, 0, new int[] { 0, 1 }); }
));

rptTop.DataBind();