linq - linq 与 max() 并加入

Question

我正在使用 linq 语句

            var renewalQuery = from r in crnnsupContext.Renewals
                               from w in crnnsupContext.WorkPlaces
                               join p in crnnsupContext.ProvStates on p.ProvinceStateID equals r.EmployerProvState
                               where  r.RegNumber == _username && r.PlaceOfWork == w.WorkID
                               select r;

有一个r.RenewalYear我想得到最近一年的，所以我尝试了类似的东西

                var renewalQuery = from r in crnnsupContext.Renewals
                               group r by r.RenewalYear into g
                               from w in crnnsupContext.WorkPlaces
                               join p in crnnsupContext.ProvStates on p.ProvinceStateID equals r.EmployerProvState
                               where  r.RegNumber == _username && r.PlaceOfWork == w.WorkID
                               select g.max(r.RenewalYear);

显然它不起作用，有人知道正确的语法吗？非常感谢

Answer 1

选择您的年份，然后使用 Max() ：

var renewalQuery = (from r in crnnsupContext.Renewals
                               group r by r.RenewalYear into g
                               from w in crnnsupContext.WorkPlaces
                               join p in crnnsupContext.ProvStates on p.ProvinceStateID equals r.EmployerProvState
                               where  r.RegNumber == _username && r.PlaceOfWork == w.WorkID
                               select r.RenewalYear).Max();