身份密码重置令牌无效

我书面方式MVC 5和使用Identity 2.0。

I'm writting MVC 5 and using Identity 2.0.

现在我米试图重设密码。但我总是得到无效令牌错误重置密码令牌。

Now I m trying to reset password. But i always getting "invalid token" error for reset password token.

    public class AccountController : Controller
{
    public UserManager<ApplicationUser> UserManager { get; private set; }

    public AccountController()
        : this(new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext())))
    {
    }

和我设置DataProtectorTokenProvider，

and i set DataProtectorTokenProvider,

        public AccountController(UserManager<ApplicationUser> userManager)
    {   
        //usermanager config
        userManager.PasswordValidator = new PasswordValidator { RequiredLength = 5 };  
        userManager.EmailService = new IddaaWebSite.Controllers.MemberShip.MemberShipComponents.EmailService(); 

        var provider = new Microsoft.Owin.Security.DataProtection.DpapiDataProtectionProvider();
        userManager.UserTokenProvider = new Microsoft.AspNet.Identity.Owin.DataProtectorTokenProvider<ApplicationUser>(provider.Create("UserToken"))
                                                    as IUserTokenProvider<ApplicationUser, string>;




        UserManager = userManager;

    }

我生成密码重置发送邮件之前

i generate password reset before sending mail

 [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> ManagePassword(ManageUserViewModel model)
    {
        if (Request.Form["email"] != null)
        {
          var email = Request.Form["email"].ToString();
          var user = UserManager.FindByEmail(email);
          var token = await UserManager.GeneratePasswordResetTokenAsync(user.Id);
           //mail send
        }
   }

我点击链接的邮件和我越来越passwordreset令牌，使用

i click link in mail and i'm getting passwordreset token and using

var result = await UserManager.ResetPasswordAsync(model.UserId, model.PasswordToken, model.NewPassword);

结果总是假的，它说：无效令牌。 我应该在哪里解决？

the result always false and it says "Invalid Token". Where should i fix ?