ASP.NET -- WebForm -- 缓存Cache的使用

把数据从数据库或文件中读取出来，放在内存中，后面的用户直接从内存中取数据，速度快。适用于经常被查询、但不经常变动的数据。

1. Test5.aspx文件与Test5.aspx.cs文件

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test5.aspx.cs" Inherits="Test5" %>

<!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:Label ID="LabelCurrentTime" runat="server" Text=""></asp:Label>

        <asp:Button ID="Button1" runat="server" Text="添加值至缓存" onclick="Button1_Click" />

        <asp:Button ID="Button2" runat="server" Text="移除缓存" onclick="Button2_Click" /><br />

        <asp:ListBox ID="ListBox1" runat="server"></asp:ListBox>

    </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;

public partial class Test5 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        LabelCurrentTime.Text = DateTime.Now.ToLongTimeString();

        if ( Cache["WeekData"]!=null)

        {

            ListBox1.DataSource = Cache["WeekData"];

            ListBox1.DataBind();

        }

        else

        {

            ListBox1.DataSource = null;

            ListBox1.DataBind();

        }

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        List<string> list = new List<string>();

        list.Add("星期日");

        list.Add("星期一");

        list.Add("星期二");

        list.Add("星期三");

        list.Add("星期四");

        list.Add("星期五");

        list.Add("星期六");

        Cache["WeekData"] = list;

    }

    protected void Button2_Click(object sender, EventArgs e)

    {

        Cache.Remove("WeekData");

    }

}