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我有一些实体,例如

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; }
   ...
}

我可以用这种方式预加载其他实体

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

但我怎么能在 AirlineTicketEntity 中预加载“FlightSailEntity”

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