Adding custom property to Client Side Entity class

Question

I need to add a custom property to an Entity Framework class, however when I do I get the "The property name XXX specified for type XXX is not valid." error. Is there some attribute I can give the property so it is ignored and not mapped to anything?

Edit: If I add a custom property, as per Martin's example below, then the following code will raise the above error at the SaveChanges call.

MyEntities svc = new MyEntities(url);
MyEntity ent = new MyEntity();
ent.MyField = "Hello, world";
svc.AddMyEntity(ent);
svc.SaveChanges();

What is the type of exception thrown? What happens if you delete your custom property? What if you rename it? — Martin Liversage
– Martin Liversage, Commented Jul 27, 2009 at 12:53
I get a System.Data.Services.Client.DataServiceRequestException (An error occurred while processing this request.), and inside that a System.Data.Services.Client.DataServiceClientException (The property name XXX specified for type XXX is not valid.). If I delete my custom property, or make it a function, it all works fine. If its a different name, the same problem occurs. — Sprintstar
– Sprintstar, Commented Jul 27, 2009 at 18:12

Martin Liversage · Accepted Answer · 2009-07-27 12:53:24Z

2

You can add a property in code:

public partial class MyEntity {
  public String MyCustomProperty {
    get;
    set;
  }
}

The Entity Framework generate partial classes enabling you to customize the generated class.

Also, to comment on your code I think should change it to something like this:

MyEntities svc = new MyEntities(url);
// Create MyEntity using the factory method.
MyEntity ent = MyEntities.CreateMyEntity(...);
ent.MyField = "Hello, world";
svc.AddMyEntity(ent);
svc.SaveChanges();

This will ensure that your entity is properly initialized.

edited Jul 27, 2009 at 12:53

answered Jul 27, 2009 at 10:19

Martin Liversage

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3 Comments

Sprintstar Over a year ago

That's what I have done but that would cause me to receive the above error when using the MyEntity class.

Martin Liversage Over a year ago

Can you clarify when you get the error? During validation of you model, when you compile, or at run-time?

Sprintstar Over a year ago

When I try to use the object to update the database, eg: MyEntities svc = new MyEntities(url); MyEntity ent = new MyEntity(); ent.MyField = "Hello, world"; svc.AddMyEntity(ent); svc.SaveChanges(); I get an exception on SaveChanges.

Glorfindel · Accepted Answer · 2021-01-16 06:15:40Z

1

Here is the answer: http://social.msdn.microsoft.com/Forums/en-US/adodotnetdataservices/thread/b7a9e01d-c5c2-4478-8f01-00f7f6e0f75f

Edit: A better link describes the final compact answer of Adding an Attribute to prevent serialization of the Entity when sending to the Service.

edited Jan 16, 2021 at 6:15

Glorfindel

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answered Jul 29, 2009 at 9:35

Sprintstar

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