Why can't I use resources as ErrorMessage with DataAnnotations?

Posted by Jova on Stack Overflow See other posts from Stack Overflow or by Jova
Published on 2010-04-22T07:17:58Z Indexed on 2010/04/22 8:03 UTC
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Why can't I do like this?

[Required(ErrorMessage = "*")]
[RegularExpression("^[a-zA-Z0-9_]*$", ErrorMessage = Resources.RegistrationModel.UsernameError)]
public string Username { get; set; }

What is the error message telling me?

An attribute argument must be a constant expression , typeof expression or array creation expression of an attribute parameter type.

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