<%@ 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(0, 30, 0));//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(1), System.Web.Caching.Cache.NoSlidingExpiration); GridView1.DataSource = dt; GridView1.DataBind(); } } }