asp.net-mvc Data annotations EDMx model - Data Annotation
Example
Edmx model internel
public partial class ItemRequest
{
public int RequestId { get; set; }
//...
}
Adding data annotation to this - if we modify this model directly, when a update to the model is made, the changes are lost . so
To add a attribute in this case 'Required'
Create a new class - any name Then
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
//make sure the namespace is equal to the other partial class ItemRequest
namespace MvcApplication1.Models
{
[MetadataType(typeof(ItemRequestMetaData))]
public partial class ItemRequest
{
}
public class ItemRequestMetaData
{
[Required]
public int RequestId {get;set;}
//...
}
}
or
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace YourApplication.Models
{
public interface IEntityMetadata
{
[Required]
Int32 Id { get; set; }
}
[MetadataType(typeof(IEntityMetadata))]
public partial class Entity : IEntityMetadata
{
/* Id property has already existed in the mapped class */
}
}
