从数据库更新类时如何保留MetadataType属性？

Question

After I made some changes on my database, I click "Update class from Database" in Visual Studio. When i do that all the Data Annotation i defined on each class disappeared. So I started to adding MetadataType attribute on classes instead of defining Data Annotation directly on the classes. It becomes less cumbersome than before. But now i have more than 10 classes and i still need to add [MetadataType(typeof(Models.MyModelClasses))] on each class again every time i update database no matter how small the changes are. Are there any better ways to keep MetadataType attribute instead of typing it again?

using System.ComponentModel.DataAnnotations;

[MetadataType(typeof(Models.Employee.EmployeeMetadata))]
public partial class employee
{
    public int ID { get; set; }
    public string PWD { get; set; }
    public string F_NAME { get; set; }
}

Answer 1

this article appears to address your issue.

-- You might also look that this SO answer thread .