How to change the ErrorMessage for int model validation in ASP.NET MVC?

Question

I have a model with a property defined like this:

    [Required(ErrorMessage="Please enter how many Stream Entries are displayed per page.")]
    [Range(0,250, ErrorMessage="Please enter a number between 0 and 250.")]
    [Column]
    public int StreamEntriesPerPage { get; set; }

This works unless the user enters something like "100q". Then a rather ugly error is displayed that says "The value '100q' is not valid for StreamEntriesPerPage."

Is there an attribute I can use to override the default error message when input is not an int?

score 25 · Accepted Answer · edited Jul 17 '18 at 00:01

25

Yes, you can use Data annotations extensions, mark your property as the following:

[Required(ErrorMessage = "Please enter how many Stream Entries are displayed per page.")]
[Range(0, 250, ErrorMessage = "Please enter a number between 0 and 250.")]
[Column]
[DataAnnotationsExtensions.Integer(ErrorMessage = "Please enter a valid number.")]
public int StreamEntriesPerPage { get; set; }

edited Jul 17 '18 at 00:01

Stefan Born

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answered Jul 05 '11 at 19:31

Feras Kayyali

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Not a fan of using third party software for such a small thing. – quakkels Jul 05 '11 at 19:57
4

the link is dead – ios_dotnet_superuser Mar 08 '17 at 11:25

score 10 · Answer 2 · answered Jul 05 '11 at 19:31

10

Try adding

[RegularExpression("\\d+", ErrorMessage = "some message here")]

Reference blog post

answered Jul 05 '11 at 19:31

Bala R

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Doesn't seem to work, I still get the default error text. – Kinetic Jun 10 '16 at 07:21
1

Seems that default integer validation has higher priority. – Sergei Apr 29 '18 at 09:08

score 10 · Answer 3 · answered Jul 05 '11 at 19:34

Much like Feras' suggestion, but without the external dependency:

using System;
using System.ComponentModel.DataAnnotations;

namespace MyDataAnnotations
{
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
    public class IntegerAttribute : DataTypeAttribute
    {
        public IntegerAttribute()
            : base("integer")
        {
        }

        public override string FormatErrorMessage(string name)
        {
            if (ErrorMessage == null && ErrorMessageResourceName == null)
            {
                ErrorMessage = "Enter an integer"; // default message
            }

            return base.FormatErrorMessage(name);
        }

        public override bool IsValid(object value)
        {
            if (value == null) return true;

            int retNum;

            return int.TryParse(Convert.ToString(value), out retNum);
        }
    }
}

Then you can decorate with an [Integer(ErrorMessage="...")] attribute.

This looks really cool. Do you have any resources I could browse to for information about inheriting from `DatatTypeAtribute`? — quakkels, Jul 05 '11 at 20:12
This doesn't seem to do anything. I created the namespace and the class with the overrides. Then, I used the namespace on my model class and added `[Integer(ErrorMessage="Please enter a whole number.")]`. When I enter '20d' I still get "The value '20d' is not valid for StreamEntriesPerPage." — quakkels, Jul 05 '11 at 20:30
It doesn't work for me either, if I use `int` as data type in my model (value of `value` is always `null`). Though if I use `string` instead of `int`, it works as expected, what could be wrong? — Gabrielius, Feb 28 '16 at 17:40

score 6 · Answer 4 · edited May 23 '17 at 12:02

I had the same problem, this solution resolved it:

Create App_GlobalResources folder for your project (right click to project -> Add -> Add ASP.NET folder -> App_GlobalResources).
Add a resx file in that folder. Say MyNewResource.resx.
Add resource key PropertyValueInvalid with the desired message format (e.g. "content {0} is invalid for field {1}"). If you want to change PropertyValueRequired too add it as well.
Add the code DefaultModelBinder.ResourceClassKey = "MyNewResource" to your Global.asax startup code.

from: How to change default validation error message in ASP.NET MVC?

score 1 · Answer 5 · answered Nov 25 '16 at 03:19

1

Try this:

[DataType(DataType.Currency, ErrorMessage ="......")]
public int YourProperty { get; set; }

answered Nov 25 '16 at 03:19

Thien

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This did not worked for me. Still getting Out of box error message "Not a valid number" – walter33 Dec 03 '21 at 07:52

score 0 · Answer 6 · edited Mar 28 '19 at 16:54

0

ErrorMessage didn't work with Range-attribute for me. I ended up using a RegularExpression-attribute.

Instead of:

[Range(0, 9, ErrorMessage = "...")]
public int SomeProperty { get; set; }

I used:

[RegularExpression("^[0-9]$", ErrorMessage = "..."]
public int SomeProperty { get; set; }

You can find regexp patterns for other ranges etc at: https://www.regular-expressions.info/numericranges.html

edited Mar 28 '19 at 16:54

openshac

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answered Aug 23 '18 at 06:49

Per

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you are missing a closing ). – domshyra Oct 02 '18 at 18:07

How to change the ErrorMessage for int model validation in ASP.NET MVC?

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