線上使用者列表統計

線上人員統計，Global.asax：using System;using System.Collections;using System.Configuration;using System.Data;using System.Linq;using System.Web;using System.Web.Security;using System.Web.SessionState;using System.Xml.Linq; namespace CountPerson{    publicclass Global: System.Web.HttpApplication    {         protectedvoid Application_Start(objectsender, EventArgs e)        {            #region OnlineUsers            try            {                DataTable userTable = newDataTable();                userTable.Columns.Add("SessionID");               userTable.Columns.Add("UserIP");               userTable.Columns.Add("Browser");               userTable.Columns.Add("OSName");                userTable.AcceptChanges();                Application.Lock();                Application["OnlineUsers"] = userTable;               Application.UnLock();            }            catch            {             }            #endregion        }         protectedvoid Session_Start(objectsender, EventArgs e)        {            try            {                string sessionid = Session.SessionID;                string userIP = Request.UserHostAddress;                HttpBrowserCapabilities bc = Request.Browser;                string osName = "win2000";                //判斷作業系統                switch (bc.Platform)                {                    case "WinNT5.1":                    case "WinXP":                        osName = "Windows XP";                        break;                    case "WinNT 5.0":                        osName = "Win2000";                        break;                    case "WinNT":                        osName = "Win2003";                        break;                    default:                        osName = bc.Platform;                        break;                }                string browser = bc.Type;                DataTable userTable = (DataTable)Application["OnlineUsers"];                if (userTable == null)                    return;                DataRow[] curRow = userTable.Select("SessionID='" + sessionid + "'");                if (curRow.Length == 0)                {                    DataRow row = userTable.NewRow();                    row["SessionID"] = sessionid;                    row["UserIP"] = userIP;                    row["Browser"] = browser;                    row["OSName"] = osName;                    userTable.Rows.Add(row);                   userTable.AcceptChanges();                     Application.Lock();                    Application["OnlineUsers"] = userTable;                   Application.UnLock();                }            }            catch            {            }        }         protectedvoid Application_BeginRequest(object sender, EventArgse)        {         }         protectedvoid Application_AuthenticateRequest(object sender, EventArgse)        {         }         protectedvoid Application_Error(objectsender, EventArgs e)        {         }         protectedvoid Session_End(objectsender, EventArgs e)        {            HashtableonlineUserHashtable = (Hashtable)Application["OnlineUsers"];           onlineUserHashtable.Remove(Request.UserHostAddress);            try            {                string sessionid = Session.SessionID;                DataTable userTable = (DataTable)Application["OnlineUsers"];                if (userTable == null)                    return;                foreach (DataRowrow in userTable.Select("SessionID='" + sessionid + "'"))                {                   userTable.Rows.Remove(row);                }               userTable.AcceptChanges();                Application.Lock();                Application["OnlineUsers"]= userTable;                Application.UnLock();            }            catch            {            }        }         protectedvoid Application_End(objectsender, EventArgs e)        {         }    }} 在頁面中使用GridView綁定使用者列表：protected void Page_Load(object sender, EventArgse)        {            DataTableuserTable = null;            try            {                userTable = (DataTable)Application["OnlineUsers"];            }            catch            {                Response.Write("獲得記憶體線上資料失敗");            }            if(userTable != null)            {                GridView1.DataSource= userTable;               GridView1.DataBind();            }        }