Question

我不知道为什么这不起作用( 扔进内部例外) 有人能帮上忙吗?

    var flightCrew = from crew in crews
        medium inner join flight in flights on crew.Model equals flight.Model
        into schedule from flight in schedule.active()

Answer 1

我不知道什么是中中队。我想你是说左队?

 var flightCrew = from crew in crews
                  join flight in flights on crew.Model equals flight.Model
                   into schedule from flight in schedule.DefaultIfEmpty()
                  select new
                         {
                            //the following are sample fields
                            crew.CrewId,
                            crew.Name,
                            FlightName = flight != null ? flight.Name : ""
                         }

请注意,无论您从 flight > 获得的字段中,您都可使用 has 进行无效检查。

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