Save data to Cache if it is not there : Cache class « Cache « ASP.NET Tutorial






  1. ASP.NET Tutorial
  2. Cache
  3. Cache class
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="SimpleDataCache" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Post Back" />
        <br />
        <br />
        <asp:Label ID="lblInfo" runat="server"></asp:Label>
    
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class SimpleDataCache : System.Web.UI.Page
{
  protected void Page_Load(Object sender, EventArgs e)
  {
    if (this.IsPostBack)
    {
      lblInfo.Text += "Page posted back.<hr />";
    }
    else
    {
      lblInfo.Text += "Page created.<hr />";
    }

    if (Cache["TestItem"] == null)
    {
      DateTime testItem = DateTime.Now;
      lblInfo.Text += "cache for 30 seconds.<hr />";
      Cache.Insert("TestItem", testItem, null,DateTime.Now.AddSeconds(30), TimeSpan.Zero);
    }
    else
    {
      lblInfo.Text += "Retrieving TestItem...<br />";
      DateTime testItem = (DateTime)Cache["TestItem"];
      lblInfo.Text += "TestItem is '" + testItem.ToString();
    }
  }

}








13.2.Cache class
13.2.1.Save data to Cache if it is not there
13.2.2.Using Data Caching