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

Question

我有两个实体Candidate和CandidateLocation，其中候选人可以拥有多个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。

要尝试演示，请参阅下面的图片（考生可以有多个位置我将其保留为一个以简化插图）

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＆amp;导航属性我非常感谢帮助。

非常感谢

Answer 1

假设你在候选人和候选人地点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))
);