无法使用关系在MVC4中加载嵌套数据

Question

这是DataController类：

    [HttpGet]
    public JsonResult EmployeeRequests()
    {
        List<EmployeeRequests> CO = new List<EmployeeRequests>();
        using (EmployeeContext dc = new EmployeeContext())
        {
            //var cust = dc.Employees.OrderBy(a => a.EmpName).ToList();
            var cust = dc.Employees.OrderBy(a => a.EmpName).ToList();
            foreach (var i in cust)
            {
                var requests = dc.Requests.Where(a => a.EmployeeID.Equals(i.EmployeeID)).OrderBy(a => a.RequestDate).ToList();


                CO.Add(new EmployeeRequests
                {
                    Employee = i,
                    Requests = requests
                });
            }
        }
        return new JsonResult { Data = CO, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
    }
}

一旦我删除它执行的表之间的关系，就无法使用关系在MVC4中加载嵌套数据。

我正在使用2个表Employee和Requests。