LINQ 查询按最旧和按 id 选择

Question

I am having this issue to select items. By now I am using this query:

var eventQuery = dbContext.ClientEvents
                          .Where(f => f.ClientEventStatusLogs.Any(e => e.StatusId == 2))
                          .Select(TransformEvent());

ClientEvents is a list of events and every event can have another list of ClientEventStatusLogs . This query works fine most of the time. But If I have new ClientEventStatusLogs on this event with StatusId not 2 it will still gives me this ClientEvent , because of ANY. ClientEventStatusLogs have date column, so I would like to check if StatusId == 2 only for the latest log.

I hope you understand my problem.

Answer 1

It sounds like you want

dbContext.ClientEvents.Where(
    f => f.ClientEventStatusLogs
        .OrderByDescending(e => e.Date)
        .FirstOrDefault()?.StatusId == 2)

Just change Date to whatever the date property name is.