public async Task <IActionResult> Create([Bind("ID,Username,Password,ConfirmPassword, Name,Avatar,RememberToken, Roles, Permissions")] UserViewModel userViewModel, IFormFile Avatar)
        {
            User user = userViewModel.GetEntity();


            if (ModelState.IsValid)
            {
                //上传头像
                long size = Avatar.Length;
                await _storage.Put(Avatar, "images/avatar");

                string url = _storage.GetFileUrl();
                if (url.Length > 0)
                {
                    user.Avatar = url;
                }

                HashPair hashPair = Encrypt.Password(userViewModel.Password);
                user.Password = hashPair.Hashed;
                user.Salt     = hashPair.Salt;
                _context.Add(user);
                rbac.AddUserRoles(user, userViewModel.Roles);
                rbac.AddUserPermissions(user, userViewModel.Permissions);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            else
            {
                GetErrorListFromModelState(ModelState);
            }

            return(Create());
        }