asp.net mvc validation must be a number custom error

Question

I am new to asp.net and I have a problem. When the users insert in a editor for a decimal field something other than numbers, they get an error "Field name" is not a number. But I don't want them to receive this message I want them to receive another message. I have no problem with this with required and range validators. Is there any way for me to do this?

I am not refering necessarily to changing the culture just displaying another message.

Thanks.

Answer 1

Hope I understand your, to change RangeValidator ErrorMessage just initialize ErrorMessage parameter:

[Range(0, 100, ErrorMessage = "Some another error message insert here!")]
[RegularExpression("\d", ErrorMessage = "!!!")]
public decimal DecimalField { get; set; }

Answer 2

This is the actual answer:

Create a class CustomClientDataTypeModelValidatorProvider. Copy the code from the MVC sources. Change the method MakeErrorString to output the appropiate message like this:

private static string MakeErrorString(string displayName)
{
    return string.Format(
        CultureInfo.CurrentCulture, 
        Core.Resources.Errors.EroareNuENr, 
        displayName);
}

I couldn't find a way not to copy the code just extend it as it uses this static method. If anyone knows this please tell me.

Then, in global.asax, I wrote this:

var cdProvider = ModelValidatorProviders.Providers.SingleOrDefault(p => p.GetType().Equals(typeof(ClientDataTypeModelValidatorProvider)));
            if(cdProvider != null)
            {
                ModelValidatorProviders.Providers.Remove(cdProvider);
                ModelValidatorProviders.Providers.Add(
                        new CustomClientDataTypeModelValidatorProvider());
            }

so that the flow would actually be routed to my class and not the class in the asp.net MVC dll

I got the idea from here: