ASP.NET C# 實現即時使用者線上

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public static class UserOnline{    /// <summary>    /// 擷取或設定線上列表    /// </summary>    public static Hashtable OnlineUserList    {        get        {            if (HttpContext.Current.Application["OnlineUserList"] == null)            {                Hashtable onlineUserList = new Hashtable();                HttpContext.Current.Application["OnlineUserList"] = onlineUserList;            }            return (Hashtable)HttpContext.Current.Application["OnlineUserList"];        }        set        {            HttpContext.Current.Application["OnlineUserList"] = value;        }    }    /// <summary>    /// 添加線上成員    /// </summary>    public static bool OnlineUserList_Add(string key, string value)    {        try        {            if (OnlineUserList.Contains(key))                OnlineUserList[key] = value;            else                OnlineUserList.Add(key, value);            return true;        }        catch        {            return false;        }    }    /// <summary>    /// 添加線上成員    /// </summary>    public static bool OnlineUserList_Add(string key)    {        string value = DateTime.Now.ToString();        return OnlineUserList_Add(key, value);    }    /// <summary>    /// 離線刪除使用者    /// </summary>    public static bool OnlineUserList_Delete(string key)    {        bool re = false;        if (OnlineUserList.Contains(key))        {            Hashtable userList = OnlineUserList;            userList.Remove(key);            OnlineUserList = userList;            return true;        }        return re;    }    /// <summary>    /// 判斷使用者是否線上    /// </summary>    public static bool UserIsOnline(string adminName)    {        OnlineClearUserOutTimeInOnLineList();        return OnlineUserList.Contains(adminName) ? true : false;    }    /// <summary>    /// 刪除逾時線上使用者    /// </summary>    public static void OnlineClearUserOutTimeInOnLineList()    {        int OnlineTimeOut = 20;        Hashtable list = new Hashtable();        Hashtable temList = new Hashtable();        list = OnlineUserList;        temList = new Hashtable(list);        foreach (DictionaryEntry de in temList)        {            //刪除逾時            DateTime onlineTime = Convert.ToDateTime(de.Value);            TimeSpan timeSpan = DateTime.Now - onlineTime;            //線上時間和目前時間間隔大於逾時分鐘數就刪除(註：使用者非法關閉瀏覽器)            if (timeSpan.TotalMinutes >= (double)OnlineTimeOut)            {                list.Remove(de.Key);            }        }        OnlineUserList = list;    }}

 

ASP.NET C# 實現即時使用者線上