我有一个简单的查询，
var RoundList = (from t1 in entities.RPlays.AsNoTracking()
where t1.Start.ToString("d") == "01/03/2017" && t1.VId == 32
select new
{
TimePlayed = t1.TimePlayed,
MatchPlayed = t1.MatchPlayed
});
让我得到消息＆＃34;表达式树可能不包含动态操作＆＃34;但它并没有说出哪里:(
我在where行上遇到了问题。
我做错了什么？
答案 0 :(得分：2)
这是由于DECLARE @loans TABLE
(
LoanID INT ,
[Month] DATETIME ,
Rate DECIMAL(4, 2) ,
[Action] VARCHAR(10)
);
INSERT @loans
( LoanID, Month, Rate, Action )
VALUES ( 1, '5/1/2000', 5.50, 'New ' ),
( 1, '9/1/2000', 6.00, 'Closed ' ),
( 2, '3/1/2000', 5.25, 'New ' ),
( 2, '5/2/2000', 5.50, 'Closed ' );
DECLARE @rates TABLE
(
Month DATETIME ,
Rate DECIMAL(4, 2)
);
INSERT @rates
( Month, Rate )
VALUES ( '1/1/2000', 5.00 ),
( '2/1/2000', 5.25 ),
( '3/1/2000', 5.25 ),
( '4/1/2000', 5.25 ),
( '5/1/2000', 5.50 ),
( '6/1/2000', 5.50 ),
( '7/1/2000', 5.50 ),
( '8/1/2000', 6.00 ),
( '9/1/2000', 6.00 ),
( '10/1/2000', 6.50 );
WITH loanStart
AS ( SELECT *
FROM @loans
WHERE Action = 'New'
),
loanEnd
AS ( SELECT *
FROM @loans
WHERE Action = 'Closed'
),
loanRanges ( loanId, lStart, lEnd )
AS ( SELECT ls.LoanID ,
ls.Month ,
le.Month
FROM loanStart ls
INNER JOIN loanEnd le ON ls.LoanID = le.LoanID
)
SELECT lr.loanId ,
r.Month ,
r.Rate ,
COALESCE(ls.Action, le.Action) AS action
FROM @rates r
INNER JOIN loanRanges lr ON r.Month >= lr.lStart
AND r.Month <= lr.lEnd
LEFT JOIN loanStart ls ON ls.LoanID = lr.loanId
AND YEAR(ls.Month) = YEAR(r.Month)
AND MONTH(ls.Month) = MONTH(r.Month)
LEFT JOIN loanEnd le ON le.LoanID = lr.loanId
AND YEAR(le.Month) = YEAR(r.Month)
AND MONTH(le.Month) = MONTH(r.Month)
ORDER BY lr.loanId ,
r.Month;
。
您应该尝试比较这样的日期：
ToString("d")