C# 如何在实体框架中包含（）子实体导航属性

我有一些实体 比如

---

但是如何在AirlineICketEntity中预加载“FlightSailEntity”

您不能使用include。那是目前。谢谢你的链接！

public class SalesOrderEntity
{
   public virtual ICollection<SalesOrderLineEntity> SalesOrderLineEntities { get; set; }
   ...
}
public class SalesOrderLineEntity
{
   public virtual SOCustomerEntity SOCustomerEntity { get; set; }
   ...
}
public class AirlineTicketEntity : SalesOrderLineEntity
{
   public virtual ICollection<FlightSailEntity> FlightSailEntities { get; set; }
   ...
}

        return _context.SalesOrderEntities
            .Include("SalesOrderLineEntities")
            .Include("SalesOrderLineEntities.SOCustomerEntity")