企业库2.0实践之缓存实践

webconfig配置：
<configSections>
    <section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings, Microsoft.Practices.EnterpriseLibrary.Caching, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
  </configSections>

 <connectionStrings>
</connectionStrings>
  <cachingConfiguration defaultCacheManager="CacheManager">
    <cacheManagers>
      <add expirationPollFrequencyInSeconds="60" maximumElementsInCacheBeforeScavenging="1000"
        numberToRemoveWhenScavenging="10" backingStoreName="Null Storage"
        name="CacheManager" />
    </cacheManagers>

cs:
 protected void Page_Load(object sender, EventArgs e)
 {
        cacheMgr = CacheFactory.GetCacheManager();
        if (!Page.IsPostBack)
        {
            cacheBlodTest();
        }
        else
        {
            readCache();
        }
}
public void cacheBlodTest()
    {
     
        Database DB = DatabaseFactory.CreateDatabase("localDB");
        DbCommand cmd = DB.GetSqlStringCommand("select top 6 newsid,newsline,newsday,imgpath,news_color,url from dbo.VIEW_NEWS_TITLE_INDEX ORDER BY news_sort DESC, index_id DESC");
        dt = DB.ExecuteDataSet(cmd).Tables[0];
        //cacheMgr["key1"]
        //约对过期策略
        cacheMgr.Add("dtkey", dt, CacheItemPriority.Normal,
            null, new ICacheItemExpiration[] { new AbsoluteTime(TimeSpan.FromSeconds(10)) });

        //相对过期策略
       // cacheMgr.Add("key2", "value2",
          //  CacheItemPriority.Normal, null,
           // new SlidingTime(TimeSpan.FromMinutes(1)));
        readCache();
    }
    public void readCache()
    {
        DataTable toBeDisplay = (DataTable)cacheMgr.GetData("dtkey");
 //判断是否为空
 if (this.ListBox1.Items.Count > 0)
        {
            this.ListBox1.Items.Clear();
        }
             if(toBeDisplay.Rows.Count >0)
            {
                foreach (DataRow dr in toBeDisplay.Rows)
                 {
                         this.ListBox1.Items.Add(dr[0].ToString());
                 }
                    
              }
    }