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var query = 源数据.GroupBy(p => p.ClientId).Select(p => p.OrderBy(x => x.Time).First());
from p in tb
group p by p.ClientId into g
select new {
key = g.Key,
first = (from i in g
orderby i.Time descending
select i).First()
}
descending 降序。from l in list
group l by l.ClientId into g
select g.OrderBy(x=>x.Time).First()