LINQ TO DataSet:数据表上的多个分组依据 [英] LINQ TO DataSet: Multiple group by on a data table

问题描述

我正在使用 Linq to dataset 来查询数据表.如果我想对数据表的Column1"执行分组，我使用以下查询

I am using Linq to dataset to query a datatable. If i want to perform a group by on "Column1" on data table, I use following query

var groupQuery = from table in MyTable.AsEnumerable()
group table by table["Column1"] into groupedTable

select new
{
   x = groupedTable.Key,
   y = groupedTable.Count()
}

现在我想对两列Coulmn1"和Column2"执行分组.谁能告诉我语法或给我一个解释数据表上多个分组依据的链接??

Now I want to perform group by on two columns "Coulmn1" and "Column2". Can anybody tell me the syntax or provide me a link explaining multiple group by on a data table??

谢谢

推荐答案

您应该创建一个匿名类型来按多个列进行分组:

You should create an anonymous type to do a group by multiple columns:

var groupQuery = from table in MyTable.AsEnumerable()
group table by new { column1 = table["Column1"],  column2 = table["Column2"] }
      into groupedTable
select new
{
   x = groupedTable.Key,  // Each Key contains column1 and column2
   y = groupedTable.Count()
}

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