我的 SQL 查询如下所示,在 SQL 中运行良好 我需要将其转换为 LINQ 语法
SQL-
SELECT [Key], Id
FROM LocalizationKeys AS lk
WHERE NOT EXISTS (SELECT 1
FROM Languages AS l
JOIN LocalizationValues AS lv ON l.Id = lv.LanguageId
WHERE l.Title = 'en-US' AND lv.LocalizationKeyId = lk.Id)
我试过的 LINQ 语法
var result =
(from lk in localizationKey
where !(from l in lang
join lv in localizationValue on l.Id equals lv.LanguageId
where l.Title == "en-US" && lv.LocalizationKeyId == lk.Id select 1).FirstOrDefault()
select lk).ToList();
获取错误:
Operator '!' cannot be applied to operand of type 'int'
有什么地方出错了吗?
最佳答案
你可以这样尝试:
(from lk in localizationKey
where (from l in lang
join lv in localizationValue on l.Id equals lv.LanguageId
where (l.Title == "en-US" && lv.LocalizationKeyId == lk.Id)
select l).FirstOrDefault() == null
select lk).ToList();
或
(from lk in localizationKey
where !(from l in lang
join lv in localizationValue on l.Id equals lv.LanguageId
where !(l.Title == "en-US" && lv.LocalizationKeyId == lk.Id)
select l).FirstOrDefault().Any()
select lk).ToList();
关于c# - 使用不存在和连接的 SQL 查询到 LINQ 语法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36326800/