Linq to SQL等效于SUM GROUP BY SQL语句

Question

我很难弄清楚如何将这个简单的SQL语句转换为（c＃）linq到SQL：

SELECT  table1.vat, SUM(table1.QTY * table2.FLG01 + table1.QTY * table2.FLG04) 
FROM table1
inner join table2 on table2.key= table1.key
where  '2010-02-01' <= table1.trndate   and  table1.trndate <= '2010-02-28'
Group by table1.vat

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Answer 1

我仍在学习LINQ，但这似乎可行

var result = from t1 in table1
             from t2 in table2
             where t1.key == t2.key && DateTime.Parse("2010-02-01") <= t1.trndate && t1.trndate <= DateTime.Parse("2010-02-28")
             group new {t1,t2} by t1.vat into g
             select new { vat = g.Key, sum = g.Sum(p => p.t1.QTY*p.t2.FLG01 + p.t1.QTY*p.t2.FLG04)};

我希望能够很好地将LINQ转换为SQL，因为我仅在对象上进行过尝试。