如何在LINQ中做GroupBy多列
SQL中类似的代码:
SELECT * FROM <TableName> GROUP BY <Column1>,<Column2>
如何将其转换为LINQ:
QuantityBreakdown
(
MaterialID int,
ProductID int,
Quantity float
)
INSERT INTO @QuantityBreakdown (MaterialID, ProductID, Quantity)
SELECT MaterialID, ProductID, SUM(Quantity)
FROM @Transactions
GROUP BY MaterialID, ProductID
当前回答
程序样例:
.GroupBy(x => new { x.Column1, x.Column2 })
其他回答
var Results= query.GroupBy(f => new { /* add members here */ });
group x by new {x. col, x. col}
.GroupBy(x => (x.MaterialID, x. producd))
好的，这个是:
var query = (from t in Transactions
group t by new {t.MaterialID, t.ProductID}
into grp
select new
{
grp.Key.MaterialID,
grp.Key.ProductID,
Quantity = grp.Sum(t => t.Quantity)
}).ToList();
使用匿名类型。
Eg
group x by new { x.Column1, x.Column2 }
