我正在尝试填充一个DropDownList并在提交表单时获取选定的值：
这是我的模特儿：
public class Book
{
public Book()
{
this.Clients = new List<Client>();
}
public int Id { get; set; }
public string JId { get; set; }
public string Name { get; set; }
public string CompanyId { get; set; }
public virtual Company Company { get; set; }
public virtual ICollection<Client> Clients { get; set; }
}
我的控制器：
[Authorize]
public ActionResult Action()
{
var books = GetBooks();
ViewBag.Books = new SelectList(books);
return View();
}
[Authorize]
[HttpPost]
public ActionResult Action(Book book)
{
if (ValidateFields()
{
var data = GetDatasAboutBookSelected(book);
ViewBag.Data = data;
return View();
}
return View();
}
我的形式：
@using (Html.BeginForm("Journaux","Company"))
{
<table>
<tr>
<td>
@Html.DropDownList("book",(SelectList)ViewBag.Books)
</td>
</tr>
<tr>
<td>
<input type="submit" value="Search">
</td>
</tr>
</table>
}
当我单击时,Action中的参数’book’始终为空.
我究竟做错了什么？
解决方法
在HTML中,下拉框仅发送简单的标量值.在你的情况下,这将是所选书籍的ID：
@Html.DropDownList("selectedBookId",(SelectList)ViewBag.Books)
然后调整您的控制器操作,以便您从传递给控制器操作的ID中检索该书籍：
[Authorize]
[HttpPost]
public ActionResult Action(string selectedBookId)
{
if (ValidateFields()
{
Book book = FetchYourBookFromTheId(selectedBookId);
var data = GetDatasAboutBookSelected(book);
ViewBag.Data = data;
return View();
}
return View();
}
