c# – 重置密码时出错

我在Web服务器中部署此项目时收到以下错误消息.它完全在我的localhost模式下工作.

错误信息

Cannot edit this User The data protection operation was unsuccessful.
This may have been caused by not having the user profile loaded for
the current thread’s user context,which may be the case when the
thread is impersonating.!

这是忘记密码的方法

[AllowAnonymous]
    public ActionResult ForgotPassword()
    {
        return View();
    }            

    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> ForgotPassword(ForgotPasswordViewModel model)
    {

        if (model.UserName == null)
        {
            ModelState.AddModelError("","Please enter the Username");
        }

        if (model.Email == null)
        {
            ModelState.AddModelError("","Please enter the Email ID");
        }

        if (model.Email == null & model.UserName == null)
        {
            ModelState.AddModelError("","Please enter the Username and Email ID");
        }

        if(ModelState.IsValid)
        {
            var username = await UserManager.FindByNameAsync(model.UserName);
            var user = await UserManager.FindByEmailAsync(model.Email);



            if (user != null && username != null)
            {
                ApplicationDbContext context = new ApplicationDbContext();
                UserStore<ApplicationUser> store = new UserStore<ApplicationUser>(context);


                var provider = new Microsoft.Owin.Security.DataProtection.DpapiDataProtectionProvider("MyProject"); 
                UserManager.UserTokenProvider = new Microsoft.AspNet.Identity.Owin.DataProtectorTokenProvider<ApplicationUser>(provider.Create("EmailConfirmation"));
                var code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);

                System.Net.Mail.MailMessage m = new System.Net.Mail.MailMessage(
                new System.Net.Mail.MailAddress("sample@email.lk","My Application"),new System.Net.Mail.MailAddress(user.Email));
                m.Subject = "Reset your Password";
                m.IsBodyHtml = true;

                m.Body = string.Format("<img src="@@IMAGE@@" alt=""><BR/><BR/>Hi {0},<BR/><BR/>Please click the below link to reset your password. <BR/><BR/> <a href="{1}" title="Reset Password">Reset Password</a>",user.UserName,Url.Action("ResetPassword","Account",new { UserId = user.Id,code = code },Request.Url.Scheme)) + string.Format("<BR/><BR/>Regards,<BR/>We Are <BR/>");



                 string attachmentPath = Server.MapPath("~/Images/hec-logo.png");

                string contentID = Path.GetFileName(attachmentPath).Replace(".","") + "@zofm";

                Attachment inline = new Attachment(attachmentPath);
                inline.ContentDisposition.Inline = true;
                inline.ContentDisposition.DispositionType = DispositionTypeNames.Inline;
                inline.ContentId = contentID;
                inline.ContentType.MediaType = "image/png";
                inline.ContentType.Name = Path.GetFileName(attachmentPath);
                m.Attachments.Add(inline);

                // replace the tag with the correct content ID
                m.Body = m.Body.Replace("@@IMAGE@@","cid:" + contentID);

                System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("11.11.11.111");
                smtp.Port = 11;
                smtp.Credentials = new System.Net.NetworkCredential("sample@email.lk","8888888");
                smtp.EnableSsl = false;
                smtp.Send(m);

                // Don't reveal that the user does not exist or is not confirmed

            }



            return View("ForgotPasswordConfirmation");
        }


      else 
      {
            ModelState.AddModelError("","The Username or Email ID is invalid.");
      }
        // If we got this far,something failed,redisplay form
        return View(model);
    }