[置顶] 页面缓存，cache，设置缓存过期时间，OutputCache

页面缓存

方法一：

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //缓存有数据
            if (Cache["List"] == null)
            {
                string sql = "select * from [dbo].[sys_user]";

                ////没有过期时间
                ////Cache["List"] = AutoCodeKldder.SqlHelper.ExeccutDataTable(sql);
                //Cache.Insert("List", AutoCodeKldder.SqlHelper.ExeccutDataTable(sql));
                
                //带过期时间(15秒)
                Cache.Insert("List", AutoCodeKldder.SqlHelper.ExeccutDataTable(sql), null, DateTime.Now.AddSeconds(15), System.Web.Caching.Cache.NoSlidingExpiration);
            }
            //从缓存拿数据
            DataTable data = Cache["List"] as DataTable;
            StringBuilder str = new StringBuilder();
            if (data.Rows.Count > 0)
            {
                foreach (DataRow row in data.Rows)
                {
                    string name = row["loginId"].ToString().Trim();
                    str.Append(name + "<br />");
                }
            }
            Response.Write(str.ToString().Trim());
        }
    }

方法二：

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //前台有<%@ OutputCache Duration="15" VaryByParam="none" %>标记 页面缓存15秒
            //Duration 以秒为单位的缓存时间
            //VaryByParam 区分参数 带参数的为： VaryByParam="id" or VaryByParam="id;name" or VaryByParam="*"
            string sql = "select * from [dbo].[sys_user]";
            DataTable data = AutoCodeKldder.SqlHelper.ExeccutDataTable(sql);
            StringBuilder str = new StringBuilder();
            if (data.Rows.Count > 0)
            {
                foreach (DataRow row in data.Rows)
                {
                    string name = row["loginId"].ToString().Trim();
                    str.Append(name + "<br />");
                }
            }
            Response.Write(str.ToString().Trim());
            Response.Write(DateTime.Now.ToString());
        }
    }

。前台有<%@ OutputCache Duration="15" VaryByParam="none" %>标记 页面缓存15秒
。Duration 以秒为单位的缓存时间
。VaryByParam 区分参数 带参数的为： VaryByParam="id" or VaryByParam="id;name" or VaryByParam="*"