[英]How to use constant value in Linq left join?
我需要在Linq表達式中的sql下面的左聯接中使用常量值。 如何在linq表達式中實現這一目標。
SELECT *
FROM [dbo].[s1AlertLog] AS [Extent1]
LEFT OUTER JOIN [dbo].[smManualChapter] AS [Extent4] ON [Extent1].[mwEventDetailKey] = [Extent4].[ID] and [Extent1].mwEventTypeKey = 300 Where Extent1.mwcUsersKey = 8000
LINQ
var list = (from alert in ctx.Set<S1AlertLog>()
join smManualChapter in ctx.Set<SmManualChapter>() on new { alert.MwEventDetailKey, alert.MwEventTypeKey } equals new { smManualChapter.ID, 300}
into temp1
from tempChapter in temp1.DefaultIfEmpty()
select alert
);
var result = list.Where(x=>x.mwcUsersKey == 8000);
您需要在匿名類型中使用相同的字段名稱:
var list = (from alert in ctx.Set<S1AlertLog>()
join smManualChapter in ctx.Set<SmManualChapter>()
on new { d = alert.MwEventDetailKey, t = alert.MwEventTypeKey }
equals new { d = smManualChapter.ID , t = 300 }
into temp1
from tempChapter in temp1.DefaultIfEmpty()
select alert
);
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