结果实体框架5中的LINQ子查询

Question

I've the following class

public class Interview
{
    public int Id { get; set; }
    public ICollection<InterviewSlot> Slots { get; set; }
}

public class InterviewSlots
{
    public int Id { get; set; }
    public Candidate Candidate { get; set; }
}

public class Candidate
{
    public int Id { get; set; }
}

I want something like this,

var candidates = _DbContext.Interviews.Where(i => i.Id == Id).Select(s => s.Slots.Select(c => c.Candidate).ToList();

I want to get all the in a interview.

What would the be for this??

Answer 1

I'm thinking it may be along the lines of something like this in linq:

var candidates = _DbContext.Interviews.Where(i => i.Id == id)
    .SelectMany(interview => interview.Slots)
    .Select(slot => slot.Candidate)
    .ToList();

tho, without seeing exactly how you plan to use it, quite a tricky one to answer.

Answer 2

I don't really understand your question

What would the LINQ be for this??

But here's what you need in order to get all candidates in an interview.

Without null checking.

var interview = _DbContext.Interviews.Where(i => i.Id == Id).Single();
var candidates = interview.Slots.Select(s => s.Candidate);

With null checking

var interview = _DbContext.Interviews.Where(i => i.Id == Id).SingleOrDefault();
if (interview != null)
    var candidates = interview.Slots.Select(s => s.Candidate);

In one line

_DbContext.Interviews.Where(i => i.Id == Id)
                     .Single()
                        .Slots.Select(s => s.Candidate);