首先，我们需要定义一对多关系的ViewModel。假设我们有一个学校，一个学校可以有多个班级，每个班级又可以有多个学生。我们可以定义以下ViewModel：

public class SchoolViewModel{
    public int SchoolId { get; set; }
    public string Name { get; set; }
    public List Classes { get; set; }
}

public class ClassViewModel{
    public int ClassId { get; set; }
    public string Name { get; set; }
    public List Students { get; set; }
}

public class StudentViewModel{
    public int StudentId { get; set; }
    public string Name { get; set; }
}

接下来，我们可以创建包含一些基本操作的控制器，如下所示：

public class SchoolController : Controller{
    private readonly ApplicationDbContext _context;

    public SchoolController(ApplicationDbContext context){
        _context = context;
    }

    public IActionResult Index(){
        List schools = new List();
        foreach (var school in _context.Schools){
            var classes = _context.Classes.Where(c => c.SchoolId == school.SchoolId)
                                          .Select(c => new ClassViewModel{
                                              ClassId = c.ClassId,
                                              Name = c.Name,
                                              Students = _context.Students.Where(s => s.ClassId == c.ClassId)
                                                                         .Select(s => new StudentViewModel{
                                                                             StudentId = s.StudentId,
                                                                             Name = s.Name
                                                                         })
                                                                         .ToList()
                                          })
                                          .ToList();
            schools.Add(new SchoolViewModel{
                SchoolId = school.SchoolId,
                Name = school.Name,
                Classes = classes
            });
        }
        return View(schools);
    }

    public IActionResult Create(){
        return View();
    }

    [HttpPost]
    public async Task Create(SchoolViewModel schoolViewModel){
        if (ModelState.IsValid){
            School school = new School{
                Name = schoolViewModel.Name
            };
            _context.Schools.Add(school);
            await _context.SaveChangesAsync();
            return RedirectToAction(nameof(Index));
        }
        return View(schoolViewModel);
    }

    public async Task Edit(int id){
        var school = await _context.Schools.FindAsync(id);
        if (school == null){
            return NotFound();
        }
        SchoolViewModel schoolViewModel = new SchoolViewModel{
            SchoolId = school.SchoolId,
            Name = school.Name,
            Classes = _context.Classes.Where(c => c.SchoolId == school.SchoolId)
                                       .Select(c => new ClassViewModel{
                                           ClassId = c.ClassId,
                                           Name = c