问Asp.net内核如何在视图模型实体框架中加载相关数据

EN

public class Question
{
    [Key]
    public int questionID { get; set; }
    public string questionTitle { get; set; }
    public string GroupID { get; set; }
}

1 row in questionTbl
---------
questionID = 1
questionTitle = 'What is Your Name ?'
GroupID = '3,4,5'

public class Group
{
    [Key]
    public int GroupID { get; set; }
    public string GroupName { get; set; }
}

public class GetQuestionViewModel
{
    public int questionID { get; set; }
    public string questionTitle { get; set; }
    public ICollection<Group> QuestionGroups { get; set; }
}

var questionQuery = (from a in _db.QuestionTbl
                             select new GetQuestionViewModel()
                             {
                                 questionID = a.questionID,
                                 questionTitle = a.questionTitle
                             })
                             .Include(q => q.QuestionGroups)
                             .ToList();