c# - 向 POCO 添加方法或创建单独的类来更新 POCO 的值是一种好的做法吗？

Question

向 POCO 添加方法或创建单独的类以在我们需要时更新 POCO 的值是一种好的做法吗？

例如，

public class ForUser
{
    [Required]
    public int Depratment { get; set; }

    public List<SelectListItem> DepartmentsList { get; set; }

    [Required]
    public int Role { get; set; }

    [Required]
    [StringLength(200, MinimumLength = 3, ErrorMessage = "Length Of The First Name Should  Be More Than Three Letters")]
    public string FirstName { get; set; }

    [StringLength(200, MinimumLength = 3, ErrorMessage = "Length Of The Mid Name Should  Be More Than Three Letters")]
    public string MidName { get; set; }

    [Required]
    [StringLength(200, MinimumLength = 3, ErrorMessage = "Length Of The Last Name Should  Be More Than Three Letters")]
    public string LastName { get; set; }

    [Required]
    [EmailAddress(ErrorMessage = "Invalid Email Address")]
    public string Email { get; set; }

    [StringLength(14, MinimumLength = 10 , ErrorMessage = "Length Of The Mid Name Should  Be More Than Nine Letters and Less than fourteen Letters")]
    [RegularExpression(@"^[+]?[0-9]*", ErrorMessage="Phone Number is not correct")]
    public string PhoneNumber { get; set; }

    [Required]
    public string Password { get; set; }


    public int UserId { get; set; }
    public int Company { get; set; }
    public int Country { get; set; }
    public List<SelectListItem> Roles { get; set; }
}

我只是用它来保存数据以更新 model entity 或将数据返回到 View 。有时我需要在将 object 发送到 View 之前更新一些属性，例如上面示例中名为 Roles 的列表，所以我想知道是否应该添加POCO 类的方法还是创建一个类来更新属性更好？

Answer 1

Here是这个问题的答案:

A POCO is not a DTO. POCO stands for Plain Old CLR Object, or PlainOld C# Object. It’s basically the .Net version of a POJO, Plain OldJava Object. A POCO is your Business Object. It has data,validation, and any other business logic that you want to put inthere. But there’s one thing a POCO does not have, and that’s whatmakes it a POCO. POCOs do not have persistence methods. If you havea POCO of type Person, you can’t have a Person.GetPersonById() method,or a Person.Save() method. POCOs contain only data and domain logic,no persistence logic of any kind. The term you’ll hear for thisconcept is Persistence Ignorance (PI). POCOs are PersistenceIgnorant.

我更喜欢通读整篇文章，不仅是为了得到您问题的答案，也是为了了解POCO 和DTO 之间的区别。