我有以下课程：
public class Problem : AuditableTable
{
public Problem()
{
this.Questions = new List<Question>();
}
public int ProblemId { get; set; }
public string Title { get; set; }
public virtual ICollection<Question> Questions { get; set; }
}
public Question()
{
this.Answers = new List<Answer>();
}
public int QuestionId { get; set; }
public int ProblemId { get; set; }
public virtual ICollection<Answer> Answers { get; set; }
public virtual Problem Problem { get; set; }
}
public class Answer : AuditableTable
{
public int AnswerId { get; set; }
public int QuestionId { get; set; }
public string Text { get; set; }
public virtual Question Question { get; set; }
}
我想发出这样的查询：
var problems = _problemsRepository.GetAll()
.Where(p => p.ProblemId == problemId)
.Include(p => p.Questions)
.Include(p => p.Questions.Answers)
.ToList();
return problems;
所以我可以看到问题,问题和答案信息.但我的最后一个包含有一个问题,我无法弄清楚如何包含答案.
有人可以给我一些建议.
解决方法
您可以使用.Select().
var problems = _problemsRepository.GetAll()
.Where(p => p.ProblemId == problemId)
.Include(p => p.Questions.Select(q => q.Answers))
.ToList();
现在你的答案将被包括在内.
