Question

linq用group分组后怎么得到多个字段

Answer 1

var sta = from s in LocalEdM.rain_hour
where s.rhTime > Starttime && s.rhTime <= Endtime
group s by s.CityName into g
select new { CityName = g.Key, totalP = g.Sum(p => p.prec),lon=g.FirstOrDefault().lon,lat=g.FirstOrDefault().lat };

Answer 2

var ary = from t in list
group t by new { t.ustomerid, t.productid } into g
select new { key = g.Key, source = g};