Question

我使用ASP.NET Identity，当用户想要注册时会收到此错误：

值不能为空。\ r \ nParameter name：manager。

这是我的注册行动代码：

public virtual ActionResult Register(string nm, string em, string ps)
    {
        var redirectUrlPanel = new UrlHelper(Request.RequestContext).Action("Index", "HomeUsers", new { area = "Users" });
        var redirectUrlAuction = new UrlHelper(Request.RequestContext).Action("Auction", "Default", new { area = "" });

        if (ModelState.IsValid)
        {
            try
            {
                var user = new Q_Users();
                user.UserName = nm;
                user.Email = em;
                user.SecurityStamp = Guid.NewGuid().ToString();

                var adminresult = UserManager.Create(user, ps);

                //Add User Admin to Role Admin
                if (adminresult.Succeeded)
                {
                    //Find Role Admin
                    var role = RoleManager.FindByName("Admin");
                    var result = UserManager.AddToRole(user.Id, role.Name);
                    if (result.Succeeded)
                    {
                        return Json(new { OK = "1", UrlPanel = redirectUrlPanel, UrlAuction = redirectUrlAuction });
                    }
                }
                else
                {
                    return Json(new { OK = "0", UrlPanel = redirectUrlPanel, UrlAuction = redirectUrlAuction });
                }
            }
            catch (Exception ex) { }
            return Json(new { OK = "0", UrlPanel = redirectUrlPanel, UrlAuction = redirectUrlAuction });
        }
        else
        {
            return Json(new { OK = "0", UrlPanel = redirectUrlPanel, UrlAuction = redirectUrlAuction });
        }
    }

此行中的错误：var adminresult = UserManager.Create(user, ps);

Answer 1

由于未初始化角色管理器而出现错误

要解决此问题，请按照以下步骤操作

在IdentityModels.cs文件夹的Models文件中，将下面的类添加到Models namespace。

  public class ApplicationRole : IdentityRole
  {
        public ApplicationRole() : base() { }
        public ApplicationRole(string name) : base(name) { }

  }

在IdentityConfig.cs文件夹中的App_Start文件中，添加下面的类

public class ApplicationRoleManager : RoleManager<ApplicationRole>
{
    public ApplicationRoleManager(IRoleStore<ApplicationRole, string> roleStore)
        : base(roleStore)
    {
    }

    public static ApplicationRoleManager Create(IdentityFactoryOptions<ApplicationRoleManager> options, IOwinContext context)
    {
        return new ApplicationRoleManager(new RoleStore<ApplicationRole>(context.Get<ApplicationDbContext>()));
    }
}

转到Startup.Auth.cs文件夹中的App_Start文件，并将下面的代码添加到ConfigureAuth方法中。
```
app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);
```

此后您应该停止获取错误。

希望这会有所帮助。

身份错误：值不能为空。\ r \ nParameter name：manager

1 个答案: