Question

我有一个管理员站点供管理员创建用户。在这里，他必须为用户选择角色 - 比如Asp.NET配置站点。我制作了3个不同角色的复选框。

[Authorize(Roles = "Admin")]
    [HttpPost]
    public ActionResult Register(RegisterModel model)
    {
        if (ModelState.IsValid)
        {

            var Rolemodel = model.RolesContainer; 
            // Attempt to register the user
            MembershipCreateStatus createStatus;
            Membership.CreateUser(model.UserName, model.Password, model.Email, null, null, true, null, out createStatus);
            if (createStatus == MembershipCreateStatus.Success)
            {
                FormsAuthentication.SetAuthCookie(model.UserName, false /* createPersistentCookie */);
                return RedirectToAction("Index", "Home");
            }
            else
            {
                ModelState.AddModelError("", ErrorCodeToString(createStatus));
            }
        }


        // If we got this far, something failed, redisplay form
        return View(model);
    }


   [Authorize(Roles = "Admin")]
    public ActionResult Register()
    {
        List<SelectListItem> tempRoles = new List<SelectListItem>();
        tempRoles.Add(new SelectListItem{ Text = "Admin", Selected = false, Value = "Admin" });
            tempRoles.Add(new SelectListItem{ Text = "Production", Selected = false, Value = "Production"});
                tempRoles.Add(new SelectListItem{ Text = "Sale", Selected = false, Value = "Sale"});

                return View(new RegisterModel { RolesContainer = tempRoles });
    }

---- --------查看

@{ foreach (var item in Model.RolesContainer)
               {
                    @Html.DisplayFor(m => item.Text)
                    @Html.CheckBoxFor(m => item.Selected)
               }
            }

当我检查并提交时，我会在Register操作中找到断点，但此时RolesContainer为空 - 有人可以告诉我为什么会这样吗？

Answer 1

我将您的代码（cshtml除外）复制并粘贴到以下文件中，并按预期工作。

<强> HomeController.cs

using System.Collections.Generic;
using System.Web.Mvc;
using MvcApplication1.Models;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {
            List<SelectListItem> tempRoles = new List<SelectListItem>();
            tempRoles.Add(new SelectListItem { Text = "Admin", 
                                               Selected = false, 
                                               Value = "Admin" });
            tempRoles.Add(new SelectListItem { Text = "Production", 
                                               Selected = false, 
                                               Value = "Production" });
            tempRoles.Add(new SelectListItem { Text = "Sale", 
                                               Selected = false, 
                                               Value = "Sale" });

            return View(new RegisterModel { RolesContainer = tempRoles });
        }

    }
}

<强> RegisterModel

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

namespace MvcApplication1.Models
{
    public class RegisterModel
    {
        [Required]
        [Display(Name = "Brugernavn")]
        public string UserName { get; set; }

        [Required]
        [DataType(DataType.EmailAddress)]
        [Display(Name = "Email adresse")]
        public string Email { get; set; }

        public List<SelectListItem> RolesContainer { get; set;}
    }
}

主/ Index.cshtml

@model MvcApplication1.Models.RegisterModel @{ foreach (var item in Model.RolesContainer) { @Html.DisplayFor(m => item.Text) @Html.CheckBoxFor(m => item.Selected) } }

您的Register.cshtml文件中很可能出现了问题，我们无需对其进行验证。

Answer 2

目前，当您将值分配给RolesContainer时，它尚未初始化。您只需要在类的构造函数中初始化它：

public class RegisterModel
{
    public RegisterModel() {
        RolesContainer = new List<SelectListItem>;
    }

    // rest of your code
}

或者你可以创建一个接受List<>作为参数的构造函数，但上面的方法适用于你当前的代码结构。

Answer 3

如果我理解得很好（可能我完全错了），您发布到httppost寄存器（RegisterModel）的模型不包含您期望的RolesContainer。我认为，asp.net mvc无法将多个复选框与List<SelectListItem>匹配，ListBox应该更好

Asp.net MVC3中的多个角色

3 个答案: