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
var Results= query.GroupBy(f => new { /* add members here */ });
其他回答
var Results= query.GroupBy(f => new { /* add members here */ });
对于多列组，试试这个…
GroupBy(x=> new { x.Column1, x.Column2 }, (key, group) => new
{
Key1 = key.Column1,
Key2 = key.Column2,
Result = group.ToList()
});
同样的方法，您可以添加Column3, Column4等。
对于VB和匿名/lambda:
query.GroupBy(Function(x) New With {Key x.Field1, Key x.Field2, Key x.FieldN })
.GroupBy(x => (x.MaterialID, x. producd))
.GroupBy(x => x.Column1 + " " + x.Column2)
