application 简介绍与计数器实例
event-handling方法描述
application_start()发生当应用程序的开始
这是他第一次收到任何用户的要求。
application_end()发生当应用程序正在关闭的时候,通常而言,是因为网络服务器正在重新启动。
application_beginrequest()中,发生在每个请求的应用得到的,就在这个页面代码被执行。
application_endrequest()
简单存值实例
<%@ page language="vb" %>
<script runat="server">
sub page_load(sender as object, e as eventargs)
lbloutput.text = "page loading" & _
"application started at: " & application("time") & "<br>" & _
"current time: " & datetime.now & "<br>"
end sub
sub click(obj as object, e as eventargs)
session.abandon()
end sub
</script>
<html><body>
<form runat="server">
<asp教程:label id="lbloutput" runat="server"/>
<asp:button id="btsubmit" runat="server" onclick="click" text="end this session"/>
</form>
</body></html>
利用application 做简单计数器
<%@ page language="c#" %>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en"
"http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<script runat="server">
void page_load()
{
lblsessioncount.text = application["sessioncount"].tostring();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="head1" runat="server">
<title>show session count</title>
</head>
<body>
<form id="form1" runat="server">
<div>
total application sessions:
<asp:label
id="lblsessioncount"
runat="server" />
</div>
</form>
</body>
</html>
锁定application
<%@ page language="c#" autoeventwireup="true" codefile="default.aspx.cs" inherits="_default" %>
<!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>untitled page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
the page has been requested
<asp:label id="mylabel" runat="server" />
times!
</div>
</form>
</body>
</html>
file: default.aspx.cs
using system;
using system.data;
using system.configuration;
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 _default : system.web.ui.page
{
protected void page_load(object sender, eventargs e)
{
if (application["pagecounter"] != null &&
(int)application["pagecounter"] >= 10)
{
application.remove("pagecounter");
}
if (application["pagecounter"] == null)
{
application["pagecounter"] = 1;
}
else
{
application.lock();
application["pagecounter"] =
(int)application["pagecounter"] + 1;
application.unlock();
}
mylabel.text = convert.tostring(application["pagecounter"]);
}
}