一，FileCache.aspx页面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="FileCache.aspx.cs" Inherits="WebApplication1.FileCache" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="Label1" runat="server" /> </div> </form> </body> </html>
二，FileCache.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.Xml.Linq; namespace WebApplication1 { public partial class FileCache : System.Web.UI.Page { /// <summary> /// 获取当前应用程序指定CacheKey的Cache对象值 /// </summary> /// <param name="cacheKey">索引键值</param> /// <returns>返回缓存对象</returns> public static object GetCache(string cacheKey) { System.Web.Caching.Cache objCache = HttpRuntime.Cache; return objCache[cacheKey]; } /// <summary> /// 设置以缓存依赖的方式缓存数据 /// </summary> /// <param name="cacheKey">索引键值</param> /// <param name="objObject">缓存对象</param> /// <param name="dep"></param> public static void SetCache(string cacheKey, object objObject, System.Web.Caching.CacheDependency caDep) { System.Web.Caching.Cache objCache = HttpRuntime.Cache; objCache.Insert( cacheKey, objObject, caDep, System.Web.Caching.Cache.NoAbsoluteExpiration, //从不过期 System.Web.Caching.Cache.NoSlidingExpiration, //禁用可调过期 System.Web.Caching.CacheItemPriority.Default, null); } protected void Page_Load(object sender, EventArgs e) { Dictionary<string, string> dic = new Dictionary<string, string>(); string CacheKey = "CacheKey"; Dictionary<string, string> objModel = GetCache(CacheKey) as Dictionary<string, string>;//从缓存中获取 if (objModel == null) //缓存里没有 { string path = Server.MapPath("SX.xml"); //读取服务器路径下的XML文件，生成Dictionary储存到缓存，并依赖这个文件 XElement root = XElement.Load(path); foreach (var item in root.Elements("Settings").Elements("row")) { var xAttribute = item.Attribute("Name"); if (xAttribute != null && !dic.ContainsKey(xAttribute.Value)) { dic.Add(xAttribute.Value, item.Attribute("Value").Value); } } System.Web.Caching.CacheDependency dep = new System.Web.Caching.CacheDependency(path); SetCache(CacheKey, dic, dep);//写入缓存，并依赖SX.xml文件 } objModel = GetCache(CacheKey) as Dictionary<string, string>; if (objModel != null) Label1.Text = objModel["V"]; //当更改服务器的SX.xml的Name=V的value时，缓存会自动更新值 } } }
三，服务器下的SX.xml
<?xml version="1.0" encoding="utf-8"?> <root> <Settings> <row Name="V" Value="13"></row> <row Name="V1" Value="11"></row> <row Name="V2" Value="12"></row> </Settings> </root>
设计思路是：将XML文件读取，储存到Dictionary<string,string>中，并同时将这个Dictionary储存到缓存并依赖XML文件，当XML文件发生变化是，缓存会自动更新改变的值