我有一个用户管理的人控制器,我试图弄清楚如何在用户从编辑页面提交时获取下拉选项。每当我点击页面提交时,视图模型中的任何值都不会传递到该帖子。我无法从下拉菜单中获得他们选择的价值来设置角色。从视图模型中的下拉菜单中获取提交的数据?
见下面的视图模型:
public class PersonViewModel
{
public int PersonId { get; set; }
[Display(Name = "Full Name")]
public string FullName { get; set; }
public string Email { get; set; }
[Display(Name = "Current Role")]
public string SetRole { get; set; }
public List<RoleListViewModel> Roles { get; set; }
}
见下控制器编辑功能:
// GET: People/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Person person = db.people.Find(id);
if (person == null)
{
return HttpNotFound();
}
PersonViewModel pvm = new PersonViewModel();
List<IdentityRole> roles = adb.Roles.ToList();
var rlvm = new List<RoleListViewModel>();
roles.ForEach(x => rlvm.Add(new RoleListViewModel { RoleId = x.Id, RoleName = x.Name }));
pvm.PersonId = person.PersonId;
pvm.FullName = person.FirstName + " " + person.LastName;
pvm.Email = person.Email;
pvm.Roles = rlvm;
ViewBag.RoleList = new SelectList(rlvm, "RoleName", "RoleName", person.CurrentRole);
return View(pvm);
}
// POST: People/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(PersonViewModel pvm)
{
if (ModelState.IsValid)
{
db.Entry(pvm).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
var usr = new AccountController();
var pers = db.people.Where(x => x.PersonId == pvm.PersonId).FirstOrDefault();
usr.UserManager.AddToRoleAsync(pers.NetId, /* their choice should go here but how? */);
db.SaveChanges();
return View(pvm);
}
这里是CSHTML:
<div class="form-group">
@Html.LabelFor(model => model.Roles, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="form-control-static">
@Html.DropDownList("RoleList", null, new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.Roles, "", new { @class = "text-danger" })
</div>
</div>
您绑定到名为'RoleList'的属性,该属性在模型中不存在。我假设你想'@ Html.DropDownListFor(m => m.SetRole,(SelectList)ViewBag.RoleList)'然后你需要删除'SelectList'构造函数中的最后一个参数(如果你想选择一个选项,那么你需要设置'SetRole'的值)。你的标签和验证信息应该绑定到'SetRole'而不是'Roles'。既然你有一个视图模型,'Roles'应该是'Enumerable'的类型,并且除掉'VIewBag'。 –
我建议你学习代码[这里](http://stackoverflow.com/questions/34366305/the-viewdata-item-that-has-the-key-xxx-is-of-type-system-int32-but -must-be-o) –