Cache缓存帮助类

using System;
using System.Web;
using System.Collections;

namespace MSCL
{
    /// <summary>
    /// Cache辅助类
    /// </summary>
    public class CacheHelper
    {
        /// <summary>
        /// 获取数据缓存
        /// </summary>
        /// <param name="CacheKey">键</param>
        public static object GetCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache[CacheKey];
        }

        /// <summary>
        /// 设置数据缓存
        /// </summary>
        public static void SetCache(string CacheKey, object objObject)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject);
        }

        /// <summary>
        /// 设置数据缓存
        /// </summary>
        public static void SetCache(string CacheKey, object objObject, TimeSpan Timeout)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, DateTime.MaxValue, Timeout, System.Web.Caching.CacheItemPriority.NotRemovable, null);
        }

        /// <summary>
        /// 设置数据缓存
        /// </summary>
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        }

        /// <summary>
        /// 移除指定数据缓存
        /// </summary>
        public static void RemoveAllCache(string CacheKey)
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            _cache.Remove(CacheKey);
        }

        /// <summary>
        /// 移除全部缓存
        /// </summary>
        public static void RemoveAllCache()
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
            while (CacheEnum.MoveNext())
            {
                _cache.Remove(CacheEnum.Key.ToString());
            }
        }
    }
}

var cache = MSCL.CacheHelper.GetCache("mydata");
List<TestTable> list = new List<TestTable>();
if (cache == null)
{
	int recordCount = 0;
	int totalPage = 0;
	list = RBAC.Dal.DataRootBase.QueryPagingMssql<TestTable>("TestTable", "*", "D_Id asc", 2, 10, "", out recordCount, out totalPage);
	//插入cache 缓存30秒
	MSCL.CacheHelper.SetCache("mydata", list, DateTime.Now.AddSeconds(30), TimeSpan.Zero);
}
else
{
	list = (List<TestTable>)cache;
}


foreach (var item in list)
{
	str += string.Format("用户名{0}密码{1}真实姓名{2}--{3}<br>", item.D_Id, item.D_Password, item.D_Name, DateTime.Now);
}