asp.net – DbFunctions.TruncateTime在ASP .NET CORE中的LINQ等

public ActionResult Index()
    {
        Dictionary<DateTime?,List<Event>> result;
        result = (from events in db.Events.Include("Activity")
                      where events.IsActive
                      group events by DbFunctions.TruncateTime(events.DateTimeFrom) into dateGroup
                      select new { EventDate = dateGroup.Key,Events = dateGroup.ToList() }).ToDictionary(x => x.EventDate,x => x.Events);

        return View(result);
    }

当我在ASP .NET CORE中使用它时,我不能使用DbFunctions.我如何重写它以使其在Microsoft.EntityFrameworkCore中工作？我正在使用SQLite,如果这有所作为.