统计网站在线人数

网站统计在线人数的功能已经很普遍，主要应用了全局变量application和session对象。描述说明就免了，大家都很熟悉简单贴一下代码，在Global.asax文件中写如下代码

 protected void Application_Start(object sender, EventArgs e)
        {
            HttpApplicationState applicationstate = GetApplicationstate();
            applicationstate["Count"] = 0;
        }

        private static HttpApplicationState GetApplicationstate()
        {
            //获取上下文对象
            HttpContext context = HttpContext.Current;
            //获得application对象
            HttpApplicationState applicationstate = context.Application;
            //在网站启动时默认当前在线人数为0
            return applicationstate;
        }

        protected void Session_Start(object sender, EventArgs e)
        {

            HttpApplicationState applicationstate = GetApplicationstate();
            //访问人数增加一个
            applicationstate["Count"] = (int)applicationstate["Count"]+1;
        }
        protected void Session_End(object sender, EventArgs e)
        {
            HttpApplicationState applicationstate = GetApplicationstate();
            //访问人数减少一个
            applicationstate["Count"] = (int)applicationstate["Count"] - 1;
        }

     然后在页面获取一下application["Count"]就可以了。在pageload事件中加上：this.lblCount.Text = this.Application["Count"].ToString();

在前台加一个label：

         当前在线人数：<asp:Label runat="server" ID="lblCount"></asp:Label>

统计在线人数就完成了。