使用自定义模型进行编辑时出现的问题

Question

我有这个数据模型：

public class User
    {
        public long UserID { get; set; }

        [Required(ErrorMessage = "User name is required.")]
        [MaxLength(50, ErrorMessage = "User name cannot be longer than 50 characters.")]
        public string UserName { get; set; }

        [Email]
        [Required(ErrorMessage = "Email is required.")]        
        [MaxLength(100, ErrorMessage = "Email cannot be longer than 100 characters.")]
        public string Email { get; set; }

        [Required(ErrorMessage = "Password is required.")]
        [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
        [DataType(DataType.Password)]        
        public string Password { get; set; }

        [MaxLength(150, ErrorMessage = "Full name cannot be longer than 150 characters.")]
        public string FullName { get; set; }

        public int UserTypeID { get; set; }

        public virtual UserType UserType { get; set; }
        public virtual ICollection<Page> Pages { get; set; }
    }

并且我使用此模型仅编辑某些字段（密码不应可编辑）：

public class EditUserModel
    {
        public long UserID { get; set; }

        [Required]
        [Display(Name = "User name")]
        public string UserName { get; set; }

        [Email]
        [Required(ErrorMessage = "Email is required.")]
        [MaxLength(100, ErrorMessage = "Email cannot be longer than 100 characters.")]
        public string Email { get; set; }

        [DataType(DataType.Text)]
        [Display(Name = "Full name")]
        [MaxLength(150, ErrorMessage = "Full name cannot be longer than 150 characters.")]
        public string FullName { get; set; }

        public int UserTypeID { get; set; }

        public virtual UserType UserType { get; set; }
    }

但我对如何将 EditUserModel 传递到我的数据上下文以更新它感到困惑。抱歉，如果看起来很简单，但我真的很困惑。

这是我修改的自动生成的编辑操作：

[IsAdministrator]
[HttpPost]
        public ActionResult Edit(EditUserModel user)
        {
            if (ModelState.IsValid)
            {
                db.Entry(user).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            ViewBag.UserTypeID = new SelectList(db.UserTypes, "UserTypeId", "Name", user.UserTypeID);
            return View(user);
        }

这是我遇到问题的行：

db.Entry(user).State = EntityState.Modified;

我创建自定义类的原因是为了避免从视图中暴露密码。

Answer 1

这不起作用，因为您正在尝试保存视图模型。

您可以使用 AutoMapper 将数据从视图模型重写到数据模型。之后您应该能够保存更改。

User userModel = Mapper.Map<EditUserModel, User>(user);
userModel = // todo: get password from database
// todo: attach your model to context and save changes

我正在使用实体框架代码优先，这种方法效果很好。