Asp.Net MVC 4.0 Model Localization With RegularExp

Question

How to create my custom RegularExpressionValidator that gets the RegularExpression and ErrorMessage from Resource file?

 [RegularExpression(@"\d{5}(-\d{4})?",
          ErrorMessageResourceType = typeof(Global), ErrorMessageResourceName = "regExpValforPostal_ErrorMessage")]
        public string PostalCode { get; set; }

Answer 1

if your resources file called Validations.he.resx and inside it you have both 'RegexExpression' and 'ErrorMessage' you should use this:

UPDATE #1: Option 2 added

• Option 1:

  public class LocalizedRegexAttribute :RegularExpressionAttribute
  {
      public LocalizedRegexAttribute () : base(Validations.RegexExpression)
      {
  
      }
  
      public override string FormatErrorMessage(string name)
      {
          return base.FormatErrorMessage(ValidationStrings.ErrorMessage);
      }
  }
  

• Option 2:

public class EmailAddressAttribute :ValidationAttribute {
public EmailAddressAttribute()
{

}

public override bool IsValid(object value)
{
    Regex regex = new Regex(Validations.RegexExpression);
    return regex.IsMatch(value.ToString());
}

public override string FormatErrorMessage(string name)
{
    return base.FormatErrorMessage(ValidationStrings.ErrorMessage);
} }

than you will use it like this:

[LocalizedRegexAttribute]
public string PostalCode { get; set; }

Answer 2

The resource file name is Global :

Global.resx, Global.zh.resx, Global.fr-ca.resx

 [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)]
    public class LocalizedRegexAttribute : RegularExpressionAttribute
    {


        static LocalizedRegexAttribute()
        {
            // necessary to enable client side validation
            DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(LocalizedRegexAttribute), typeof(RegularExpressionAttributeAdapter));
        }

        public LocalizedRegexAttribute(string _RegularExpression, string _ErrorMessageResourceName, Type _ErrorMessageResourceType)
            : base(LoadRegex(_RegularExpression))
        {
            ErrorMessageResourceType = _ErrorMessageResourceType;
            ErrorMessageResourceName = _ErrorMessageResourceName;

        }

        private static string LoadRegex(string key)
        {
            var resourceManager = new ResourceManager(typeof(Water.Localization.Resources.Global));
            return resourceManager.GetString(key);
        }

In your model class you need to pass 3 parameters with the custom data annotation as follows:

[LocalizedRegex("regExpValforPostal_ValidationExpression", "regExpValforPostal_ErrorMessage", typeof(Global))]
        public string PostalCode { get; set; }