asp.net代码练习 work084 使用Cache的示例

Shun

webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="work084.WebForm1" %>
<!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>使用Cache的示例</title>
</head>
<body>
  <form id="form1" runat="server">
  <div>
    <asp:TextBox ID="txtContent" runat="server" Columns="50" Rows="10" TextMode="MultiLine"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="显示文件内容"  />
  </div>
  </form>
</body>
</html>

webfrom1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace work084
{
  public partial class WebForm1 : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
      string content = Cache["Content"] as string;
      if (content == null)
      {
        string path = Server.MapPath("~/Content.txt");
        string text = System.IO.File.ReadAllText(path, System.Text.Encoding.UTF8);
        System.Web.Caching.CacheDependency dependency = new System.Web.Caching.CacheDependency(path);
        System.Web.Caching.CacheItemRemovedCallback callBack = new System.Web.Caching.CacheItemRemovedCallback(ItemRemovedCallBack);
        Cache.Add("Content", text, dependency, System.Web.Caching.Cache.NoAbsoluteExpiration, new TimeSpan(0,30,0), System.Web.Caching.CacheItemPriority.Default, callBack);
        txtContent.Text = text;
      }
      else
      {
        txtContent.Text = content;
      }
    }
    private void ItemRemovedCallBack(string key, object value, System.Web.Caching.CacheItemRemovedReason reason)
    {
      string path = Server.MapPath("~/Log.txt");
      string log = string.Format("键为{0}的缓存项于{1}被删除，原因是：{2}。\r\n",key,DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),reason.ToString());
      System.IO.File.AppendAllText(path, log);
    }
  }
}

[R语言] asp.net代码练习 work084 使用Cache的示例

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