Question

我正在尝试将用户添加到角色中并且正在获取＆＃34;值不能为空＆＃34;在register.cshtml类的dropdownlist部分。

Register.Cshtml

@model BlogMVC.Models.RegisterViewModel
@{
    ViewBag.Title = "Register";

}

<h2>@ViewBag.Title.</h2>

@using (Html.BeginForm("Register", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
    @Html.AntiForgeryToken()
    <h4>Create a new account.</h4>
    <hr />
    @Html.ValidationSummary("", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(m => m.RoleName, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.DropDownListFor(m=>m.RoleName, new SelectList(ViewBag.Roles,"Value","Text"),new {@class="form-control"})
        </div>
    </div>

的AccountController

   public ActionResult Register()
        {
            List<SelectListItem> list = new List<SelectListItem>();
            foreach (var role in RoleManager.Roles)
            {
                list.Add(new SelectListItem() {Value = role.Name, Text = role.Name});
            }
            ViewBag.Roles = list;
            return View();
        }

模型

public class RegisterViewModel
    {
        [Required]
        [EmailAddress]
        [Display(Name = "Email")]
        public string Email { get; set; }

        [Required]
        [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
        [DataType(DataType.Password)]
        [Display(Name = "Password")]
        public string Password { get; set; }

        [DataType(DataType.Password)]
        [Display(Name = "Confirm password")]
        [Compare("Password", ErrorMessage = "The password and confirmation password do not match.")]
        public string ConfirmPassword { get; set; }
        public string RoleName { get; set; }

我可以创建角色，但我可以添加或注册具有特定角色的新用户。可能是我错过了什么。我只是想练习一些MVC示例，我遇到了这个问题，而且我已经被困了一段时间。如果你们需要更多信息，请告诉我。我很感激任何指导。谢谢。

值不能为空。参数名称：items

0 个答案: