会话超时到期后如何运行自定义代码

在我的Startup.cs中，当时间跨度达到30分钟后，我将使用以下代码终止会话。

services.AddSession(options => {
     options.IdleTimeout = TimeSpan.FromMinutes(30); //Session Timeout.
});

what I am trying to achieve in my Startup.cs is that I want to include some sort of bool TimeExpired = true; when session expired and add the following code to update my database:

if(TimedExpired)
{ 
     RecordsContext oContext = new RecordsContext(); 
     List<Users> lUsers = oContext.Users.ToList();
     for(int i = 0; i < lUsers.Count; i++)
     {
          if(lUsers[i].usernameid == HttpContext.Session.GetString("usernameid")
          {
               lUsers[i].IsUserLoggedIn = false;
               oContext.SaveChanges();
               break;
          }
     }
}