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  • 缓存DataSet(转载)

    using System;
    using System.Data;
    using System.Configuration;
    using System.Collections;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using System.Data.SqlClient;

    public partial class Default4 : System.Web.UI.Page
    {

    protected void Page_Load(object sender, EventArgs e)
    {
    //构建新的dataset,并用Cache.Get()方法的结果为它赋值,
    //该方法返回匹配指定键名的Object实列.所以要阄它转化为dataset类型
    DataSet dst = (DataSet)Cache.Get("CachedDataSet");
    //如果dst中没有内容即为空
    if (dst == null)
    {
    //重新填充dst 并设置在内存中的保存时间...
    this.Label1.Text = "The data came from a connction to the database";
    SqlConnection con
    = new SqlConnection(ConfigurationManager.AppSettings["myCon"]);
    con.Open();
    SqlCommand cmd
    = new SqlCommand("select * from Test", con);
    SqlDataAdapter dap
    = new SqlDataAdapter(cmd);
    dst
    = new DataSet();
    dap.Fill(dst,
    "Test");
    //得到现在系统时间
    dst.ExtendedProperties.Add("CreateTime", DateTime.Now.ToLongTimeString());
    //设置在内存中的保存时间
    Cache.Insert("CachedDataSet", dst, null, DateTime.Now.AddMinutes(5), TimeSpan.Zero);
    }
    else
    {
    //dataset中已经有数据时
    this.Label1.Text = "The Data come from the cahe,It was created at:" + dst.ExtendedProperties["CreateTime"].ToString() +"<br>The current Time is:"+DateTime.Now.ToLongTimeString();
    }
    this.GridView1.DataSource = dst.Tables[0].DefaultView;//不要忘记绑定数据,两句常在一起哟。。。
    this.GridView1.DataBind();
    }

    }
    转自:
    http://www.cnblogs.com/yrScience/archive/2010/10/15/1852061.html
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  • 原文地址:https://www.cnblogs.com/johnwonder/p/1907680.html
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