c# - Linq查询中的'IN'和 'NOT IN'

我已经在LINQPad中测试了以下查询，它运行良好，但是VS2010不喜欢它。

var topJobs = from j in streetlightDBEntities.Job
    let mjobid = from m in streetlightDBEntities.Job.Include("Streetlight")
                 where m.Streetlight.StreetlightId == j.Streetlight.StreetlightId
                 orderby m.DateCompleted descending
                 select m.JobId
        where mjobid.Take(5).Contains(j.JobId)
        select j.JobId;

var notTopJobs = streetlightDBEntities.Job.Where(c => !topJobs.Contains(c.JobId));

我收到以下错误:

最佳答案

使用Queryable.Any <TSource> 。

代替这个:

var notTopJobs = streetlightDBEntities
      .Job
      .Where(c => !topJobs.Contains(c.JobId));

做这个:

var notTopJobs = streetlightDBEntities
      .Job
      .Where(c => !topJobs.Any(x => x.JobId == c.JobId))

对原始查询执行相同的操作。

关于c# - Linq查询中的'IN'和 'NOT IN'，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4301023/