asp.net mvc - optional/default value for integer field

Question

Say I have a viewmodel like so:

public class User 
{
    public int Id { get; set; }

    [Required(ErrorMessage="Username is required")]
    public string Username { get; set; }

    [Range(0, 255)]
    public int Owner { get; set; }
}

The page is submitted to it's controller where I check if ModelState.IsValid, however it doesn't pass. Obviously, owner is required. Why is that? I thought the default value for an unassigned int was 0. If I debug the app and inspect the object that is sent to the controller, the value is indeed 0.

If I don't want to force the user to enter 0, what's the best approach? I've tried adding a [DefaultValue(0)] attribute to the Owner property in the class but it does not seem to do any difference.

Some guidance would be nice even if this is such a newbie or trivial getting-used-to-the-concept kind of problem.

Regards,

Leniel Maccaferri · Accepted Answer · 2012-06-23 13:44:07Z

3

Did you try making the Owner int a nullable value?

[Range(0, 255)]
public int? Owner { get; set; }

answered Jun 23, 2012 at 13:44

Leniel Maccaferri

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1 Comment

Brian Sweeney Over a year ago

this is not working for me - maybe the Range attribute is required?

Forty-Two · Accepted Answer · 2012-09-24 16:28:57Z

0

You could check if it's null before checking modelState:

if (viewModel.Owner == null)
{
  viewModel.Owner = 0;
}

if(ModelState.IsValid)
...

answered Sep 24, 2012 at 16:28

Forty-Two

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