C# Linq to entities orderby提供了不明确的列名错误

我在LINQtoEntities（4.0）中创建了一个查询，这让我感到困惑，因为我连接了几个表，其中两个表共享一个列名（DateCreated）。当我尝试在具有相同列名的两个表之间使用orderby时，我得到了以下错误：“order子句中的列'DateCreated'不明确”

我感到困惑，因为我认为指定表意味着它将传递给SQL查询。在下面的示例中，我指定了“orderby a.Datecreated”，但在TSQL中，它只有ORDER BY

Datecreated

，而我希望看到ORDER BY

Extent1

Datecreated

using (PDFActionsEntities pdfEntities = new PDFActionsEntities())
{
    var actions = (from a in pdfEntities.PDFActions
               join f in pdfEntities.Files on a.FileID equals f.FileID into list1
               from l1 in list1.DefaultIfEmpty()
               join wp in pdfEntities.WebPages on a.WebPageID equals wp.webpageid into list2
               from l2 in list2.DefaultIfEmpty()
               orderby a.DateCreated
               select new
               {
                   ID = a.ID,
                   FileID = a.FileID,
                   WebPageID = a.WebPageID,
                   UserID = a.UserID,
                   FilePath = l1.Path,
                   URLPath = l2.url,
                   DateCreated = a.DateCreated
               });

}

下面是它创建的T-SQL

SELECT
`Extent1`.`FileID`, 
`Extent1`.`ID`, 
`Extent1`.`WebPageID`, 
`Extent1`.`UserID`, 
`Extent2`.`Path`, 
`Extent3`.`url`, 
`Extent1`.`DateCreated`
FROM `tblpdfactions` AS `Extent1` LEFT OUTER JOIN
 `tblfiles` AS `Extent2` ON `Extent1`.`FileID` = `Extent2`.`FileID` LEFT OUTER JOIN 
`tblwebpageprints` AS `Extent3` ON `Extent1`.`WebPageID` = `Extent3`.`webpageid`
ORDER BY `DateCreated` ASC

我是错过了什么还是做错了什么

另外，如果这有什么不同的话，它正在连接MySQL

---

编辑：

就在我问了这个问题之后，我看到了另一个基于左连接的问题，这让我写下：

var actions = (from a in pdfEntities.PDFActions
           join f in pdfEntities.Files on a.FileID equals f.FileID into list1
           from l1 in list1.DefaultIfEmpty()
           join wp in pdfEntities.WebPages on a.WebPageID equals wp.webpageid into list2
           from l2 in list2.DefaultIfEmpty()
           select new 
           {
               ID = a.ID,
               FileID = a.FileID,
               WebPageID = a.WebPageID,
               UserID = a.UserID,
               FilePath = l1.Path,
               URLPath = l2.url,
               DateCreated = a.DateCreated
           }).OrderBy(x => x.DateCreated);

---

我在selectnew上添加了Orderby。这现在起作用了。然而，我仍然不明白为什么当orderby在主查询中时它不会做同样的事情。嘿嘿！有点恼人，我花了大约5个小时在这几天和几秒钟内张贴，我找到了答案

您是否尝试将

orderby

移动到查询末尾的select关键字后面？ 比如：

---

TSQL可能是作为特定select new语句的部分构造生成的。您是否尝试过将财产名称更改为其他名称，如：

select new
{
    ID = a.ID,
    FileID = a.FileID,
    WebPageID = a.WebPageID,
    UserID = a.UserID,
    FilePath = l1.Path,
    URLPath = l2.url,
    Created = a.DateCreated  // Change is here
}

---

是的，我刚刚试过，而且很有效。我已经修改了操作。谢谢你的帮助。最后一个属性实际上是在以后添加的，不会影响整体结果@Pr0fess0rX给出了几乎正确的答案。谢谢。@SteveA:是啊，我的回答更像是一个骗局。我一看到他，就投了他的赞成票。

select new
{
    ID = a.ID,
    FileID = a.FileID,
    WebPageID = a.WebPageID,
    UserID = a.UserID,
    FilePath = l1.Path,
    URLPath = l2.url,
    Created = a.DateCreated  // Change is here
}