日期字段按年月统计，linq怎么写
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linq groupby
var query =
from n in test
group n by new { year = n["year"], month = n["month"] } into g
select new
{
year = g.Key.year,
month = g.Key.month
};
var query =
from n in test
group n by new { year = n["year"], month = n["month"] } into g
select new
{
year = g.Key.year,
month = g.Key.month
};
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