ASP.NET MVC 2 - Property validation

Question

I'm new to MVC and have a question regarding validation. Is there a way to dynamically set the Error Message?

For example, how could I achieve the following (ignore the hardcoded 50, this could come from the Web.config or specific to the current logged).

[MetadataType(typeof(DocumentValidation))]
public partial class Document
{
    public class DocumentValidation
    {
        private const int MaxLength = 50;

        [Required(ErrorMessage = "Document Title is required")]
        [StringLength(MaxLength, ErrorMessage = "Must be under " + MaxLength.ToString() + " characters")]
        public string Title { get; set; }
    }

}

Thanks,

Community · Accepted Answer · 2017-05-23 11:48:23Z

1

+50

Check out IDataErrorInfo and this question I asked about IDataErrorInfo vs. DataAnnotations.

edited May 23, 2017 at 11:48

CommunityBot

11 silver badge

answered Sep 2, 2010 at 14:12

Martin

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1 Comment

Dave Hogan Over a year ago

Thanks you've certainly pointed me in the right direction. I did try awarding the bounty but it's saying I have to wait 23hours.

user151323 · Accepted Answer · 2010-09-02 14:18:04Z

1

This should be possible with dynamic attributes but involves some trickery:

Dynamic Attributes in C#

answered Sep 2, 2010 at 14:18

user151323

Comments

Tx3 · Accepted Answer · 2010-08-17 08:43:38Z

0

Depending how dynamically you're trying to change ErrorMessage. This might be one solution to your problem: haacked.com - Localizing ASP.NET MVC Validation

It's a good guide to get localized error message from the resources.´

answered Aug 17, 2010 at 8:43

Tx3

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1 Comment

Dave Hogan Over a year ago

Well I'm trying to set the StringLength ErrorMessage to be a variable string rather than a constant string. The above example doesn't compile with the error: An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type. I simply want to be able to give custom error messages depending on the circumstance.

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