按多列分组

Question

如何在LINQ中执行GroupBy多列

SQL中与此类似的东西:

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

Answer 1

使用匿名类型.

例如

group x by new { x.Column1, x.Column2 }

Answer 2

程序样本

.GroupBy(x => new { x.Column1, x.Column2 })

Answer 3

好吧得到这个:

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();

Answer 4

对于按多列分组,请尝试此操作...

GroupBy(x=> new { x.Column1, x.Column2 }, (key, group) => new 
{ 
  Key1 = key.Column1,
  Key2 = key.Column2,
  Result = group.ToList() 
});

以同样的方式添加Column3,Column4等.

Answer 5

从C#7开始,你也可以使用值元组:

group x by (x.Column1, x.Column2)

要么

.GroupBy(x => (x.Column1, x.Column2))

Answer 6

您还可以使用元组<>进行强类型分组.

from grouping in list.GroupBy(x => new Tuple<string,string,string>(x.Person.LastName,x.Person.FirstName,x.Person.MiddleName))
select new SummaryItem
{
    LastName = grouping.Key.Item1,
    FirstName = grouping.Key.Item2,
    MiddleName = grouping.Key.Item3,
    DayCount = grouping.Count(), 
    AmountBilled = grouping.Sum(x => x.Rate),
}

Answer 7

C＃7.1或更大的使用Tuples和Inferred tuple element names（目前它只能linq to objects当需要表达式树例如，它不支持someIQueryable.GroupBy(...)。Github的问题）：

// declarative query syntax
var result = 
    from x in table
    group x by (x.Column1, x.Column2) into g
    select (g.Key.Column1, g.Key.Column2, QuantitySum: g.Sum(x => x.Quantity));

// or method syntax
var result2 = table.GroupBy(x => (x.Column1, x.Column2))
    .Select(g => (g.Key.Column1, g.Key.Column2, QuantitySum: g.Sum(x => x.Quantity)));

C＃3或更高版本，可使用anonymous types：

// declarative query syntax
var result3 = 
    from x in table
    group x by new { x.Column1, x.Column2 } into g
    select new { g.Key.Column1, g.Key.Column2, QuantitySum = g.Sum(x => x.Quantity) };

// or method syntax
var result4 = table.GroupBy(x => new { x.Column1, x.Column2 })
    .Select(g => 
      new { g.Key.Column1, g.Key.Column2 , QuantitySum= g.Sum(x => x.Quantity) });

Answer 8

虽然这个问题是按类属性询问,但是如果要针对ADO对象(如DataTable)按多个列进行分组,则必须将"新"项分配给变量:

EnumerableRowCollection<DataRow> ClientProfiles = CurrentProfiles.AsEnumerable()
                        .Where(x => CheckProfileTypes.Contains(x.Field<object>(ProfileTypeField).ToString()));
// do other stuff, then check for dups...
                    var Dups = ClientProfiles.AsParallel()
                        .GroupBy(x => new { InterfaceID = x.Field<object>(InterfaceField).ToString(), ProfileType = x.Field<object>(ProfileTypeField).ToString() })
                        .Where(z => z.Count() > 1)
                        .Select(z => z);