ASP.NET-DropDownListFor绑定model数据

在ASP.NET中，DropDownListFor绑定model数据比用html的select方便太多了，配合listmode这种模型集合就可以在controller里面直接foreach循环处理listmode里面的数据，不管是做什么都很方便，不再涉及对象的转来转去

   <td>
@Html.DropDownListFor(model => model[i].AdDirectoryViewModel.AccountType, ViewData["accounttypes"] as List<SelectListItem>, "--请选择账户类型--", new {@class = "dropdown", onchange = "ChangeCompanies()"})
  </td>
  <td>
  @Html.DropDownListFor(model => model[i].UIViewModel.Company, ViewData["accounttypes"] as List<SelectListItem>, "--请选择公司类型--", new { @class = "dropdown", id = "companies", onchange = "ChangeDepts()" })
  @*<select class="dropdown" id="companies" name="companies" onchange="ChangeDepts()">
  <option value="">--请选择公司--</option>
  </select>*@
  </td>
  <td>
  @Html.DropDownListFor(model => model[i].UIViewModel.Dept, ViewData["accounttypes"] as List<SelectListItem>, "--请选择部门类型--", new { @class = "dropdown", id = "depts", onchange = "ChangeTitles()" })
  @*<select class="dropdown" id="depts" name="depts" onchange="ChangeTitles()">
  <option value="">--请选择部门--</option>
  </select>*@
  </td>
  <td>
  @Html.DropDownListFor(model => model[i].UIViewModel.Title, ViewData["accounttypes"] as List<SelectListItem>, "--请选择职位类型--", new { @class = "dropdown", id = "titles" })
  @*<select class="dropdown" id="titles" name="titles">
  <option value="">--请选择职务--</option>
  </select>*@
  </td>

当然这样联动了jquery方法的dropdownlist提前显示下拉菜单，那就设置一个新的List来代替

例子一：只有一个“请选择”选项的下拉菜单：

 @Html.DropDownListFor(model => model[i].UIViewModel.Dept, new List<SelectListItem> {　　new SelectListItem() { Text = "请选择", Value = (null as bool?).ToString() }}, "--请选择部门类型--", new { @class = "dropdown", id = "depts", onchange = "ChangeTitles()" })

例子二：没有下选项的下拉菜单

@Html.DropDownListFor(model => model[i].UIViewModel.Dept, new List {　　new SelectListItem() {}}, "--请选择部门类型--", new { @class = "dropdown", id = "depts", onchange = "ChangeTitles()" })

在github上找到了一个关于listmode的详细事例的项目，可以研究研究参考一下

> http://pan.baidu.com/s/1i4QkaNV