c# - DropDownListFor 报告类型不匹配

Question

模型：

    [Required(ErrorMessage = "You must assign this user a role")]
    [Display(Name = "Role")]
    public string UserRole { get; set; }

    public IEnumerable<System.Web.Mvc.SelectListItem> UserRoles { get; set; }

控制器：

    public ActionResult CreateNewUser()
    {
        CreateNewUserModel model = new CreateNewUserModel();
        model.UserRoles = new []
        {
            new SelectListItem{Value="Administrator", Text="Administrator"},
            new SelectListItem{Value="User", Text="User"}
        };
        //model.UserRole = "Administrator";
        return View(model);
    }

看法：

    @Html.DropDownListFor(x => x.UserRole, Model.UserRoles,"Select a role")
    @Html.ValidationMessageFor(x=>x.UserRole)

加载创建新用户的页面时，我有一个异常说明UserRole must be of type IEnumerable<SelectList>

Answer 1

尝试改变：

model.UserRoles = new []
    {
        new SelectListItem{Value="Administrator", Text="Administrator"},
        new SelectListItem{Value="User", Text="User"}
    };

至：

model.UserRoles = List<SelectListItem>
    {
        new SelectListItem{Value="Administrator", Text="Administrator"},
        new SelectListItem{Value="User", Text="User"}
    };