<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DemoCache.aspx.cs" Inherits="WebApplication1.DemoCache" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Cache存数据"
onclick="Button1_Click" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<asp:Button ID="Button2" runat="server" Text="取值" onclick="Button2_Click" />
<br />
<asp:Button ID="Button3" runat="server" Text="查看活动商品" onclick="Button3_Click" />
<br />
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
namespace WebApplication1
{
public partial class DemoCache : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
//Cache缓存对象
//Cache数据是公共的，存放在服务器内容中，可以设置过期或依赖项过期(如:改变文件时过期)
string n = TextBox1.Text;
//Cache.Insert("appName", n, null, DateTime.Now.AddDays(1), System.Web.Caching.Cache.NoSlidingExpiration);//绝对到期
Cache.Insert("appName", n, null,System.Web.Caching.Cache.NoAbsoluteExpiration, new TimeSpan(, , ));//多少时间后过期
Response.Write("OK");
}
protected void Button2_Click(object sender, EventArgs e)
{
//Cache 在使用的时候，有自动锁，所有没有Lock与unLock方法
object obj = Cache["appName"];
if (obj!=null)
{
Response.Write("名称为"+obj);
}
}
//查看商品
protected void Button3_Click(object sender, EventArgs e)
{
//将缓存数据呈现不通过访问数据库的方式
if (Cache["data"] != null)
{
DataTable d = Cache["data"] as DataTable;
GridView1.DataSource = d;
GridView1.DataBind();
}
else
{
BindList();
}
}
private void BindList()
{
string sql = "select * from student";
DataTable dt = SQLHelper.GetTable(sql);
//将数据放到缓存中，减少服务器压力
Cache.Insert("data", dt, null, DateTime.Now.AddDays(), System.Web.Caching.Cache.NoSlidingExpiration);
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
}