在选择语句上使用联接时无法将 SQL 转换为 LINQ

Question

伙计们，

尝试将以下 SQL-Server 命令转换为 LINQ。我已经通过 SSMS 验证了 SQL 是否正确运行。

select top 100 tts.* from tblLCState tts
INNER JOIN
    (SELECT fldLCID, MAX(fldStateDate) AS Statedate
    FROM tblLCState
    GROUP BY fldLCID) grptts 
ON tts.fldLCID = grptts.fldLCID 
AND tts.fldStateDate = grptts.Statedate
where fldLCStateCode = 1
order by fldStateDate desc

我很困惑如何将表 tblLCState 加入到 select 语句中。我对 LNIQ 的尝试如下：

from tRow in tblLCState
join irow2 in (from iRow in tblLCState
    group iRow by iRow.fldLCID into g
    select new {fldLCID = g.Key, MaxStateDate =  (from t2 in g select t2.fldStateDate).Max()} ) 
on ((tRow.fldStateDate = irow2.MaxStateDate) and (tRow.fldLCID = irow2.g.fldLCID))

错误出现在 on 子句中的 and 运算符上，表明 a ) 是预期的。在这一点上，我还没有尝试过 where/order/top 100。只是花了很多时间寻找这种形式或任何其他形式没有运气的加入。我在另一张桌子上看到了很多要加入的帖子，但不幸的是我没有这种奢侈。

任何帮助将不胜感激。

谢谢

汤姆·D.

Answer 1

LINQ

  var result = (from tRow in tblLCState
                join irow2 in (from iRow in tblLCState
                                group iRow by iRow.fldLCID into g
                                select new { fldLCID = g.Key, MaxStateDate = g.Max(k => k.fldStateDate) })
                on new { StateDate = tRow.fldStateDate, tRow.fldLCID } equals new { StateDate = irow2.MaxStateDate, irow2.fldLCID }
                select tRow);