using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Security;using System.Web.SessionState;using System.IO;namespace ZhengGong{    public class Global : System.Web.HttpApplication    {        protected void Application_Start(object sender, EventArgs e)        {            Application.Lock();            Application["dateTime"] = DateTime.Now.ToShortDateString();            Application["ipList"] = new List
     
      ();            //默认总访问记录数为0            Application["count"] = 0;            //默认当前在线数为0            Application["online"] = 0;            //将当前人数写入文件中            WriteCountPerson(0);            Application.UnLock();        }        protected void Session_Start(object sender, EventArgs e)        {            //临时日期和系统记录的日期对比，若不相等表示不是同一天            string tempDate = DateTime.Now.ToShortDateString();            string appDate = Application["dateTime"].ToString();            if (!tempDate.Equals(appDate))            {                Application["dateTime"] = tempDate;                Application["ipList"] = null;                int countNums = ReadCountPerson();                WriteCountPerson(countNums + int.Parse(Application["count"].ToString()));            }            //发起会话的客户端IP地址            string tempIp = Context.Request.UserHostAddress;            //设置一个会话的作用时间为一分钟，即一分钟内不做任何操作的话，该会话就会失效。            Session.Timeout = 1;            //用于存储客户端的IP地址集合，若没有则表示是新的一天并且实例化出集合对象            List
      
        ipList = Application["ipList"] as List
       
        ;            if (ipList == null)            {                ipList = new List
        
         ();        //如果ipList集合为空那么实例化他            }            //读取出文件中保存的总访问人数            int countNums_2 = ReadCountPerson();            if (!ipList.Contains(tempIp))            {                //在ip集合中添加客户端IP地址                ipList.Add(tempIp);                Application["ipList"] = ipList;                //总访问数在文件中保存的数据累加1                countNums_2 += 1;                WriteCountPerson(countNums_2);            }            //当前在线人数累加1            Application["online"] = (int)Application["online"] + 1;            Application["count"] = countNums_2;            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)        {            Application.Lock();            Session.Abandon();                                            //当以一个会话结束后，注销该会话            int online = int.Parse(Application["online"].ToString());            if (online <= 0)            {                Application["online"] = 0;            }            else            {                Application["online"] = (int)Application["online"] - 1;            }            Application.UnLock();        }        protected void Application_End(object sender, EventArgs e)        {        }        /// 
         
        /// 写入网页总访问人数        /// 
        /// 
                 public void WriteCountPerson(int nums)        {            string filePath = System.Web.HttpRuntime.AppDomainAppPath + "ConfigFiles\\countPersonNums.ini";            if (!File.Exists(filePath))            {                File.Create(filePath);            }            StreamWriter sw = new StreamWriter(filePath, false);            sw.WriteLine("访问总数为:" + nums);            sw.Flush();            sw.Close();        }        /// 
         
        /// 读取网页总访问人数        /// 
        public int ReadCountPerson()        {            try            {                int nums = 0;                string filePath = System.Web.HttpRuntime.AppDomainAppPath + "ConfigFiles\\countPersonNums.ini";                if (!File.Exists(filePath))                {                    return 0;                }                FileStream fs = new FileStream(filePath, FileMode.Open);                StreamReader streamReader = new StreamReader(fs);                string strLine = streamReader.ReadLine();                string[] split = strLine.Split(':');                if (split.Length <= 1)                {                    return 0;                }                int.TryParse(split[1], out nums);                fs.Flush();                fs.Close();                streamReader.Close();                streamReader.Dispose();                return nums;            }            catch (Exception ex)            {                throw ex;            }        }    }}
        
       
      
     

直接贴出代码，使用c# 的Global.asax 全局配置文件来做处理，效果测试过大致可以但是有个小bug就是  关闭浏览器再打开浏览器那个sestion_start事件会再次执行，那么当前在线人数会有误，有待解决。