asp.net 服务器内置对象（application对在线人数统计）

首先我们先添加一个“全局应用程序"然后再里面写代码

 protected void Application_Start(object sender, EventArgs e)
        {
            Application["conte"] = 0;
            Application["chat"]="";

            TimeoutException te = new TimeoutException();
            
        }

 protected void Session_Start(object sender, EventArgs e)
        {
            Application["conte"] = (int)Application["conte"] + 1;
        }

 protected void Session_End(object sender, EventArgs e)
        {
            Application["conte"] = (int)Application["conte"] - 1;
        }