C# System.NotSupportedException是否使用DateTime？Linq中的实体

我有一个System.NotSupportedException使用DateTime？在Linq中创建实体

我最初的方法如下所示：

public TransportOrderLine GetLastTransportOrderLine(bool isDriver, int? driverId, int? haulierId , DateTime date, IDatabaseContext db)
{
    var lines =
        db.Query<TransportOrderLine>()
          .Where(x => ((isDriver && x.TransportOrder.DriverId == driverId) ||
                      (!isDriver && x.TransportOrder.HaulierId == haulierId)) &&
                      x.StartDatePlanned.HasValue &&
                      EntityFunctions.TruncateTime(x.StartDatePlanned) <= date)
                      .ToList();

    return lines.OrderByDescending(x => x.TransportOrder.Sequence)
                .ThenByDescending(x => x.Sequence).LastOrDefault();
}

我也试过：

lines = lines.Where(x => (DateTime)EntityFunctions
             .TruncateTime((DateTime)x.StartDatePlanned.Value)
             .Value <= date).ToList(); //error here

任何人都知道解决办法

感谢您的关注：

这是我的解决方案：

var lines =
    db.Query<TransportOrderLine>()
      .Where(x => ((isDriver && x.TransportOrder.DriverId == driverId) ||
                  (!isDriver && x.TransportOrder.HaulierId == haulierId)) &&
                  x.StartDatePlanned.HasValue)
                  .ToList().Where(x => (DateTime)x.StartDatePlanned.Value <= date);

---

尝试EntityFunctions.TruncateTimex.StartDatePlanned.Value？Tim。唐，我已经试过了。请参阅最后一个代码块。请参阅：@IgorSemin EntityFunctions是专门为数据库知道的函数而存在的。@IgorSemin这将把LINQ2EF转换为LINQ2Object，sql server知道什么是EntityFunctions.TruncateTime

var lines =
    db.Query<TransportOrderLine>()
      .Where(x => ((isDriver && x.TransportOrder.DriverId == driverId) ||
                  (!isDriver && x.TransportOrder.HaulierId == haulierId)) &&
                  x.StartDatePlanned.HasValue)
                  .ToList().Where(x => (DateTime)x.StartDatePlanned.Value <= date);