MVC3 更新关联数据有关问题

MVC3 更新关联数据问题
Model中：

C# code

[Table("CompanyInfo")]    public class CompanyInfo    {        [Key]        public int id { get; set; }        [Required(AllowEmptyStrings=false, ErrorMessage="请输入单位名称")]        public string CompanyName { get; set; }        [Required(AllowEmptyStrings=false, ErrorMessage="请选择省份")]        public string ProvinceId { get; set; }        [Required(AllowEmptyStrings = false, ErrorMessage = "请选择城市")]        public string CityId { get; set; }        public List<AccountInfo> AccountInfos{ get; set; }        public List<DepartmentId> DepartmentIds { get; set; }    }

C# code

[Table("AccountInfo")]    public class AccountInfo    {        [Key]        public int id { get; set; }        [Column("CompanyId")]        public int CompanyInfoId { get; set; }        public string AccountName { get; set; }        public string TaxNumber { get; set; }        public string Address { get; set; }        public string Telephone { get; set; }        public string Account { get; set; }        public string Bank { get; set; }    }

C# code

[Table("DepartmentId")]    public class DepartmentId    {        [Key]        public int id { get; set; }        [Column("CompanyId")]        public int CompanyInfoId { get; set; }        [Required(AllowEmptyStrings=false, ErrorMessage="请输入下属部门名称")]        public string DepartmentName { get; set; }    }

在对CompanyInfo对象进行“update”操作的时候，
自身的属性字段是可以编辑并更新成功的，但是对关联的表Account和表DepartmentId进行的编辑却无法更新成功，求帮助。
更新的代码：

C# code

public ActionResult Edit(int id)        {            CompanyInfo companyInfo = CRMDB.CompanyInfos.Include(x => x.AccountInfos).Include(x => x.DepartmentIds).Where(x => x.id == id).Single();            return View(companyInfo);        }[HttpPost]        public ActionResult Edit(CompanyInfo companyInfo)        {            if (ModelState.IsValid)            {                                CRMDB.Entry(companyInfo).State = EntityState.Modified;                CRMDB.SaveChanges();                return RedirectToAction("Index");            }            return View(companyInfo);        }

编辑页面中的代码：
//前部分对Company对象编辑
//对象中关联到Account 的list 将其逐一显示成编辑状态

这部分是其中的List部分
<fieldset>
  <legend>单位下属部门信息列表</legend>
  <p>
  @Html.ActionLink("Create New","Create", "AccountInfo", new { id = Convert.ToInt32(@ViewBag.companyInfoid) })
  </p>
  <table class='nqtable' width='100%'>
  @if (Model.DepartmentIds != null && Model.DepartmentIds.Count > 0)
  {
  <tr class='nqtrheader'>

  <th>
  部门名称
  </th>
  <th>
  操作
  </th>
  </tr>
   
  foreach (var item in Model.DepartmentIds)
  {
  @Html.HiddenFor(model => item.id)
  item.CompanyInfoId = Model.id;
  @Html.HiddenFor(model =>item.CompanyInfoId)

  <tr>
  <td>
  @Html.EditorFor(model => item.DepartmentName)
  @Html.ValidationMessageFor(model => item.DepartmentName)
  </td>
  <td>
  @Html.ActionLink("Delete", "Delete", "DepartmentIds", new { id = item.id })
  </td>
  </tr>
  }
  }
  </table>
  </fieldset>

  <p>
  <input type="submit" value="提交保存" />
  </p>

//提交更新——却没有修改保存关联部分的信息

[解决办法]
companyInfo在更新的时候，含有需要更新的对象吗？他们的数据是脏的吗？

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