Question

我很难将这个查询表达式转换为我的LINQ表达式。

SELECT 
    r.Disc_code
    ,r.SEX 
FROM RACE r     
WHERE r.EVENT_CODE = 100 
GROUP BY 
    r.SEX
    , r.disc_Code
order by r.disc_code

我可以使用一个表，但我没有看到任何链接stackoverflow或MSDN中的两个组表达式的示例。我错过了什么吗？

Answer 1

也许是这样的：

        var results = from r in dataContext.Race
                      where r.EVENT_CODE == 100
                      orderby r.Disc_Code ascending
                      group r by new { r.Sex, r.Disc_Code } into g
                      select g.Key;

Answer 2

以下是VB.NET中grouping by multiple列的示例。

Dim query = From r In db.Race _
            Where r.EVENT_CODE = 100 _
            Order By r.disc_Code _
            Group By Key = New With {r.Sex, r.disc_Code} Into Group _
            Select Key, Group

Answer 3

要根据多个条件进行分组，您必须执行以下操作：

var query = from book in books
group book by new {book.author, book.editor} into books;

访问它们：

var author = books.Key.author;
var editor = books.Key.editor;

将组SQL表达式转换为LINQ

3 个答案: