.net文件依赖缓存

.net的文件依赖缓存,是指缓存内容依赖于某个文件的变更状态,一旦这个文件变更了,缓存内容则被清除失效。

下面这个例子,一旦html文件被改变,就向httpruntime.cache中insert一个新的数组:Cache.Insert("TimeNow", timestr, dep);

 

myCacheDependency.aspx

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



<!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>文件依赖缓存</title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

    

    </div>

    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />

    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

    </form>

</body>

</html>

 

myCacheDependency.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.Caching;



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

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            Label1.Text = DateTime.Now.ToString();

        }



    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        string timestr = Convert.ToString(HttpRuntime.Cache["TimeNow"]);

        if (String.IsNullOrEmpty(timestr))

        { 

            //如果获取失败,重载当前时间

            timestr = DateTime.Now.ToString();



            //新建缓存依赖

            CacheDependency dep = new CacheDependency(Server.MapPath("./myPageCache.htm"),DateTime.Now);



            //插入缓存

            Cache.Insert("TimeNow", timestr, dep);

        }

        //显示时间

        Label1.Text = timestr;

    }

}

 myPageCache.htm (内容略)

 

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