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使用application对象显示在线人数，Global.asax文件
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Security; using System.Web.SessionState; namespace ManageStudent { public class Global : System.Web.HttpApplication { protected void Application_Start(object sender, EventArgs e) { //在应用程序启动时运行的代码 //初始化变量：UserCount（） Application.Lock();//临界变量，使用加锁功能 Application["UserCount"] = 0; Application.UnLock();//临界变量被解锁 } protected void Session_Start(object sender, EventArgs e) { //在新会话启动时运行的代码 //用户数量加1 Application.Lock(); Application["UserCount"] = Int32.Parse(Application["UserCount"].ToString()) + 1; Application.UnLock(); } protected void Application_BeginRequest(object sender, EventArgs e) { } protected void Application_AuthenticateRequest(object sender, EventArgs e) { } protected void Application_Error(object sender, EventArgs e) { } protected void Session_End(object sender, EventArgs e) { //在新会话结束时运行的代码 //注意：只有在web.config文件中的sessionstate模式设置为InProc时。 //如果会话模式设置为StateServer或SQLServer，则不会引发该事件 //用户数量减一 Application.Lock(); Application["UserCount"] = Int32.Parse(Application["UserCount"].ToString())- 1; Application.UnLock(); } protected void Application_End(object sender, EventArgs e) { } } }
接下来，需要在web.config配置文件中<system,web>标签内添加如下一条语句
<sessionState mode="InProc"/>
在ApplicationDemo.aspx中写入代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ApplicationDemo.aspx.cs" Inherits="ManageStudent.ApplicationDemo" %> <!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></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="lblUserCount" runat="server" Text=""></asp:Label><br /> <asp:Button ID="btnLogout" runat="server" Text="注销" OnClick="btnLogout_Click" /> </div> </form> </body> </html>
在cs文件中，写入代码，用于显示在线人数
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace ManageStudent { public partial class ApplicationDemo : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { lblUserCount.Text = "网站在线人数：" + Application["UserCount"] + "人"; } } protected void btnLogout_Click(object sender, EventArgs e) { //销毁Session Session.Abandon(); } } }
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原文地址：http://www.cnblogs.com/niexianxue/p/4439746.html
