Global

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;
using System.Text.RegularExpressions;
using System.Data;
namespace Web
{
    public class Global : System.Web.HttpApplication
    {
                protected void Application_Start(object sender, EventArgs e)
        {
            DataTable dtS = DBUtility.DbHelperSQL.Query("select * from 表名").Tables[0];
            DataTable dtT = DBUtility.DbHelperSQL.Query("select * from 表名").Tables[0];
            int count = dtS.Rows.Count + dtT.Rows.Count;
            Application.Add("total", count);
            Application.Add("online", 0);
        }

        protected void Session_Start(object sender, EventArgs e)
        {
            Application.Lock();//关闭会话，解决同时发生的情况
            Application["total"] = (int)Application["total"] + 1;//总的访问量加1
            Application["online"] = (int)Application["online"] + 1;//当前在线人数加1
            Application.UnLock();
        }

        protected void Application_BeginRequest(object sender, EventArgs e)
        {
            // 非法字符过滤
            Security.FilterModule.Filter(Request);
        }

        protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {

        }

        protected void Application_Error(object sender, EventArgs e)
        {

        }

        protected void Session_End(object sender, EventArgs e)
        {
            Application.Lock();//锁
            Application["online"] = (int)Application["online"] - 1;//当前在线人数减1
            if(Session["usertype"].ToString()=="student")
            {
                DataTable dt = DBUtility.DbHelperSQL.Query("select * from 表名 where  Day(CreateTime)=Day(getdate()) and UserName='" + Session["username"] + "'").Tables[0];
                if (dt.Rows.Count > 0)
                {
                    smodel = sbll.GetModel(int.Parse(dt.Rows[0]["Id"].ToString()));
                    smodel.Online = false;
                    smodel.ExitTime = DateTime.Now;
                    smodel.UpdateTime = DateTime.Now;
                    sbll.Update(smodel);
                }
            }
            if (Session["usertype"].ToString() == "teacher")
            {
                DataTable dt = DBUtility.DbHelperSQL.Query("select * from 表名 where Day(CreateTime)=Day(getdate()) and UserName='" + Session["username"] + "'").Tables[0];
                if (dt.Rows.Count > 0)
                {
                    tmodel = tbll.GetModel(int.Parse(dt.Rows[0]["Id"].ToString()));
                    tmodel.Online = false;
                    tmodel.ExitTime = DateTime.Now;
                    tmodel.UpdateTime = DateTime.Now;
                    tbll.Update(tmodel);
                }
            }
            Application.UnLock();//解锁
        }

        protected void Application_End(object sender, EventArgs e)
        {

        }
    }
}