将用户添加到角色上在注册失败ASP.NET MVC3

Question

我希望使用户能够选择在asp.net mvc Web应用程序中注册时的角色。 我以前通过asp.net addministration工具添加角色。 这是我在注册方法中使用的代码

public ActionResult Register()  
{
ViewData["roleName"] = new SelectList(Roles.GetAllRoles(), "roleName");
return View();
}


 [HttpPost]
    public ActionResult Register(RegisterModel model)
    {
        if (ModelState.IsValid)
        {
            // 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)
            {
                Roles.AddUserToRole(model.UserName, "roleName");
                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);
    }

在注册视图中时，我得到了此代码

    <label for="roleName">Select Role:</label>
         @Html.DropDownList("roleName")
         @Html.ValidationMessage("roleName")

尽管角色是写在数据库和用户中的。 但是UsersInRoles表为空，我得到了此异常

System.Configuration.Provider.ProviderException：找不到角色“ roleName”。

有人有同样的问题吗？

Answer 1

您应将roleName参数添加到Register控制器操作中，以被用户roleName选择，或从FormCollection中检索roleName，此处是示例将您的Register post操作更改为：

        [HttpPost]
        public ActionResult Register(RegisterModel model, String roleName)
        {
            if (ModelState.IsValid)
            {
                // 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)
                {
                    Roles.AddUserToRole(model.UserName, roleName);
                    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);
        }