Linq Navigation Properties复杂的ID in(从...中选择id)

Question

我有两个实体Candidate和CandidateLocation,其中候选人可以有多个CandidateLocation条目.

CandidateLocation包含CandidateId,ISO国家代码(例如US,GB)和类型列(1 =允许,2 =受限制).

规则规定如果候选人在CandidateLocation表中没有任何"Permitted"条目,他们可以在任何地方工作.如果他们有明确的"允许"位置,他们只能在明确允许的位置工作.他们不能在明确的限制地点工作.

要试一试这个,请看下面的图片(候选人可以有多个位置,我把它保持为一个,以简化图示)

在SQL中,实现此目的的一种方法是以下查询

SELECT  *
FROM    Candidate
WHERE   Candidate.IsArchived = 0
    AND
        -- Do not inlude restricted locations (RestrictionStatus = 2)
        Candidate.CandidateId NOT IN (SELECT CandidateId FROM CandidateLocation WHERE IsArchived = 0 AND CountryISOCode = @Location AND RestrictionStatus = 2)
    AND
        (
        -- Include Explicit Permitted Locations
        Candidate.CandidateId IN (SELECT CandidateId FROM CandidateLocation WHERE IsArchived = 0 AND CountryISOCode = @Location AND RestrictionStatus = 1)
        OR
        -- Include Candidates with no Explicit Permitted Locations
        Candidate.CandidateId NOT IN (SELECT CandidateId FROM CandidateLocation WHERE IsArchived = 0 AND RestrictionStatus = 1)
        )

如果有人知道如何使用linq和导航属性实现这一点,我将非常感谢帮助.

非常感谢

Answer 1

假设你在候选人和候选人之间有一对多的关联

Context.Candidates.Where(c => c.IsArchived == 0 &&
!c.CandidateLocations.Any(
    l => l.CountryISOCode == location && l.RestrictionStatus == 2) &&
(c.CandidateLocations.Any(
    l => l.CountryISOCode == location && l.RestrictionStatus == 1) ||
!c.CandidateLocations.Any(
    l => l.RestrictionStatus == 1))
);