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如何選擇實體框架中兩個字段之間的差異作爲持續時間。以下是相應的SQL查詢:選擇計算字段
SELECT InitiateTime, StartTime, EndTime, Ano,Bno, datediff(s,StartTime,EndTime) as duration
FROM [NEPALIVR2].[dbo].[CDR]
WHERE StartTime >= startDate and StartTime <= endDate order by StartTime desc
LINQ
from u in db.CDRs
where u.InitiateTime >= startDate && u.InitiateTime <= endDate
orderby u.InitiateTime descending
select new
{
InitiateTime = u.InitiateTime,
StartTime = u.StartTime,
EndTime = u.StartTime,
Ano = u.Ano,
Bno = u.Bno,
Duration = (SqlFunctions.DateDiff("mi", u.StartTime, u.EndTime))/360,
};
這將返回錯誤:喜歡你的問題
Cannot implicitly convert type
'System.Linq.IQueryable<AnonymousType#1>'
to'System.Linq.IQueryable<IVRControlPanel.Models.CDR>'
. An explicit conversion exists (are you missing a cast?)
如果我有創造新的CDR則錯誤爲'沒有在CDR' – CodeManiac 2013-02-27 06:19:53
@CodeManiac時間的定義,您使用的CodeFirst,或映射到現有的數據庫? – 2013-02-27 06:20:36
映射到現有的數據庫.. – CodeManiac 2013-02-27 06:22:52