RequiredAttribute on private fields

Question

I have a entity

public class Avatar
{
      [Key]
      public int Id { get; set; }
      [Required]
      private string _linkInString { get; set; }

      [NotMapped]
      public Uri Link
      {
           get { return new Uri(_linkInString); }
           set { _linkInString = value.AbsoluteUri; }
      }

 }

which has a private field (_linkInString) because URI couldn't be saved in database as Uri, only as string.

When at first run, my database is creating I gettable Avatar with only Id column.

Any ideas on how to get around this?

EDIT I just found out that: - names with underscore as first letter are abandoned. - use of internal gives the same result.

score 2 · Answer 1 · edited Apr 03 '14 at 20:00

2

Create a public mapped string field which returns what you want to save as a string representation of your URI. Since your public URI is not mapped all works as you described of course.

Edit:

Please change this:

[Required]
private string _linkInString { get; set; }

Into this:

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

How does it save now?

edited Apr 03 '14 at 20:00

Moe Howard

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answered Oct 06 '11 at 18:12

Davide Piras

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could you show me some example? I don't understand you good because of my poor english. – user278618 Oct 06 '11 at 18:20
yes, of course. So, I actually understood your answer before, but it's hard me to understand that I can't use private fields – user278618 Oct 07 '11 at 06:52

score 1 · Accepted Answer · edited May 23 '17 at 09:59

1

There is one very big limitation of code mapping in EF. It follows accessibility rules. So private field is private to your class and it is not mapped because context doesn't see it.

If you want to play with EF this way give up code first / fluent mapping and use EDMX where this is possible.

edited May 23 '17 at 09:59

Community

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answered Oct 07 '11 at 08:37

Ladislav Mrnka

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RequiredAttribute on private fields

2 Answers2