我怎麼能LINQ 3表

Question

我怎樣才能linq 3表我可以連接一個學生和學校。表是：Students, Depart, School.

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

下面是連接兩個表

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

Answer 1

你想要什麼？你可以加入他們的行列......

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

如果您有關聯cdonfigured正確，而不是加入，你也可以使用關聯：

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