我怎么能linq 3表

Question

如何linq我可以将学生与学校联系起来的3个表格。表格是：Students, Depart, School.

studentId(pk), departId(fk) departId(pk), schoolId(fk) schoolId(pk)

下面是连接两个表

@foreach (var student in Model.students.Where(s => s.schoolId == item.schoolId)) 

Answer 1

你想要什么？你可以加入他们......

var query = (from depart in Model.Depart
             join school in Model.School on depart.departId equals school.departId
             join student in Model.students on school.schoolId equals student.schoolId
             where students.schoolId == item.schoolId
             select new
             {
                 depart,
                 school,
                 student
             });

...或

Answer 2

如果您的关联正确配置，而不是连接，您也可以使用关联：

var query = from school in Model.Schools
            from dept in school.Departments
            from student in dept.Students
            select new { student, dept, school};