c# - 如何在 LINQ 表达式中对多个级别进行排序？

Question

我有以下 LINQ 表达式:

public IList<Objective> GetObjectives(int examId)
    {
        var objectives = _objectivesRepository
            .GetAll()
            .Where(o => o.ExamId == examId || examId == 0)
            .Include(o => o.ObjectiveDetails)
            .ToList();
        return objectives;
    }

public partial class Objective
{
    public int ObjectiveId { get; set; }
    public int ExamId { get; set; }
    public int Number { get; set; }
    public virtual ICollection<ObjectiveDetail> ObjectiveDetails { get; set; }
}

public partial class ObjectiveDetail
{
    public int ObjectiveDetailId { get; set; }
    public int ObjectiveId { get; set; }
    public int Number { get; set; }
    public string Text { get; set; }
}

如何修改此表达式，以便按 Number 的顺序返回 Objective，并按 Number 的顺序返回 ObjectiveDetails？

Answer 1

public IList<Objective> GetObjectives(int examId)
    {
        var objectives = _objectivesRepository
            .GetAll()
            .Where(o => o.ExamId == examId || examId == 0)
            .Include(o => o.ObjectiveDetails.OrderBy(d => d.Number))
            .OrderBy(o => o.Number);
            .ToList();
        return objectives;
    }