在注册时将用户添加到角色mvc 5 [英] Adding user to role upon registration mvc 5

问题描述

我有2个角色Admin and Donor



注册后，任何用户都必须加入Donor角色。如何使用identity和mvc5实现此目的。

I have 2 roles Admin and Donor

Upon registration any user must be added to the Donor role. How do I achieve this with identity and mvc5.

[HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = model.GetUser();
                var result = await UserManager.CreateAsync(user, model.Password);
                UserManager.AddToRole(user.UserName, "User");
                if (result.Succeeded)
                {
                    return RedirectToAction("Index", "Account");
                }

            }

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

我收到以下错误System.InvalidOperationException：找不到UserId。

I getthe following error System.InvalidOperationException: UserId not found.

推荐答案

首先检查结果，然后只添加角色。这意味着更改UserManager.AddToRole的位置，如：

First check for result, then only add role. That mean change the position of UserManager.AddToRole like:

var user = model.GetUser();
var result = await UserManager.CreateAsync(user, model.Password);
if (result.Succeeded)
    result = UserManager.AddToRole(user.Id, "User");

如果您有角色列表，也可以添加多个角色。

You can add multiple roles too if you have a list of roles.

foreach(var role in roles)
{
   var isInRole = await UserManager.IsInRoleAsync(userid, role)
   if(!isInRole)
   {
      await UserManager.AddToRoleAsync(userid, role);
   }
}

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