ASP.NET -- WebForm -- 缓存Cache的使用

2018-11-22 08:44:13来源：博客园阅读 ()

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>

View Code

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");
    }
}