请教如何将SQL转换成LINQ语句，语句如下
select document,max(P1) as P1,max(P2) as P2 from table group by document

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var source=from t in table group t by t.document into g select new{key=g.key,P1=g.Max(s=>s.P1),P2=g.Max(ss=>ss.P2)};