我有5个表，我想使用linq从中获取一些信息。我正在使用以下查询从数据中读取数据。
var query = (from GRD in _tblStudents.GetQueryable()
join apt in _tblApplicants.GetQueryable()
on GRD.ApplicantID equals apt.ApplicantID
join cls in _tblClasses.GetQueryable()
on GRD.CityID equals cls.ClassID
join prg in _tblPrograms.GetQueryable()
on cls.ProgramID equals prg.ProgramID
join city in _tblCities.GetQueryable()
on GRD.CityID equals city.CityID
where GRD.AcademicYearID == yearId && cls.ProgramID == programId
group apt by new{apt.Gender} into grouped
select new CityWiseStudentModel
{
CityName=city.CityName,
//'city' does not exist in the current context
Gender = grouped.Count(),
programName=prg.Program,
//'prg' does not exist in the current context
}
);
我如何从城市表中获取城市名称和从PRG表中获取程序名称
group <--> by <--> into <--> 将您的范围更改为 IGrouping<a,b>
我的看法不仅apt.Gender是您的钥匙，city.CityName而且prg.Program
试试这个（或一些类似的）：
group apt by new{apt.Gender, city, prg} into grouped
select new CityWiseStudentModel
{
CityName = grouped.Key.city.CityName,
Gender = grouped.Count(), //rename GenderCount
programName = grouped.Key.prg.Program,
// Gender = grouped.Key.Gender,
}
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我来说两句