如何向实体框架生成的.cs文件添加属性

Question

I am creating a ASP.net MVC web app and trying to add validation attributes to a ClientsTbl.cs file I have generated from a SQL server using entity framework. I have done scaffolding and created the view and the controller for the Table(Model), but for some reason the scaffold did not recognize the primary key column as a primary key. On top of that it will not let me add attributes in []. I can't even change the field description that appears above the views form text box. How do I do the above in the following class?

namespace Testit.Models
{
using System;
using System.Collections.Generic;

public partial class ClientsTbl
{
    public ClientsTbl()
    {
        this.ProgramClientTbls = new HashSet<ProgramClientTbl>();
    }

    public int id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int CenterId { get; set; }
    public string MiddleName1 { get; set; }
    public string MiddleName2 { get; set; }
    public System.DateTime DateAdded { get; set; }

    public virtual CenterTbl CenterTbl { get; set; }
    public virtual ICollection<ProgramClientTbl> ProgramClientTbls { get; set; }
}
}

Answer 1

You can create a metadata class to do that. For example, if Id, FirstName, and LastName are required fields, you can create a new class like below.

public class ClientsTblMetadata
{
    [Required()]
    public int Id { get; set; }

    [Required()]
    public string FirstName { get; set; }

    [Required()]
    public string LastName { get; set; }
}

Then you need to add a new partial class with a MetadataType attribute. Please make sure that this class is located under the same namespace, otherwise it won't work.

namespace Testit.Models
{
    [MetadataType(typeof(ClientsTblMetadata))] // you need this line of code.
    public partial class ClientsTbl