LINQ 从 2 个表中获取数据 1 加入 group by

Question

我有 2 张桌子。

Department         |              Questions
ID     Name        |         DepartmentID   QTitle   QDescription
1       a          |             1           aaa          bbb
2       b          |             1           ddd          ccc      
3       c          |             2           eee          fff
                   |             2           ggg          hhh

| 我想用 ViewModel 对数据进行分组并在 View 中显示。我可以使用 QTitle 获取分组数据，但 QDescription 不能。

Linq 查询

var questions= (from s in dbContext.Questions
                         join b in dbContext.Department
                         on s.DepartmentID equals b.ID
                         group s.QTitle by b.DepartmentID into g
                         select new QuestionGroupedViewModel
                         {
                             DepartmentName= g.Key,
                             QTitle= g.ToList()
                         }).ToList();

视图模型

public class QuestionGroupedViewModel
    {
     public string DepartmentName{ get; set; }
     public List<string> QDescription{ get; set; }
     public List<string> QTitle{ get; set; }
    }

Answer 1

var questions= (from s in dbContext.Questions
                         join b in dbContext.Department
                         on s.DepartmentID equals b.ID
                         group s by b.DepartmentName into g
                         select new QuestionGroupedViewModel
                         {
                             DepartmentName= g.Key,
                             QTitle= g.Select(x => x.QTitle).ToList(),
                             QDescription = g.Select(x => x.QDescription).ToList()
                         }).ToList();