使用 linq 为 devexpress 网格控制创建主细节

Question

如何在两个列表之间建立关系，并在带有主详细信息的网格中显示它们。 我写了这个，但没有用：

        var students = (from s in new XPQuery<StudentOfClass>(session)
                       join e in new XPQuery<Exam>(session) on s equals e.StudentOfClass
                       select new
                       {
                           LastName = s.Student.LastName,
                           Score = e.Score,
                           Grade = e.GradeTitle,
                           Class = s.Class,
                       }).ToList();
        var classes = (from c in new XPQuery<Class>(session)
                      select new
                      {
                          Class = c,
                          StudentsOfClass = students.Where(x=>x.Class == c),
                      }).ToList();
        gcClass.DataSource = classes;

我还在网格中添加了一个关卡并将其命名为“StudentsOfClass”

where 子句有错误。

Answer 1

像这样写代码

var classes = from c in new XPQuery<Class>(session)
    select new Class
    {
        Class = c,
        Student = students,
    };

并创建与列表中所有列相同的网格列