/// <summary>
/// Validates a VAT number
/// </summary>
/// <param name="vat">The VAT (with country identification) of a registered company</param>
/// <returns>VatValidationResult</returns>
public static VatValidationResult IsValid(string vat)
{
vat = vat.Sanitize();
if (string.IsNullOrWhiteSpace(vat))
{
return(VatValidationResult.Failed("VAT number cannot be null or empty."));
}
if (vat.Length < 3)
{
return(VatValidationResult.Failed($"VAT number '{vat}' is too short."));
}
var countryCode = vat.Substring(0, 2);
if (!EUVatValidators.TryGetValue(countryCode, out var validator))
{
return(VatValidationResult.Failed($"{countryCode} is not a valid ISO_3166-1 European member state."));
}
var vatNumber = vat.Substring(2);
return(validator.Validate(vatNumber));
}
/// <summary>
///
/// </summary>
/// <param name="vat"></param>
/// <returns></returns>
/// <exception cref="ViesValidationException"></exception>
public VatValidationResult Validate(string vat)
{
if (Regex == null)
{
throw new ViesValidationException("The regex to validate format is null.");
}
return(!Regex.IsMatch(vat)
? VatValidationResult.Failed($"Invalid {CountryCode} vat: format")
: OnValidate(vat));
}
/// <summary>
/// Validates a given country code and VAT number
/// </summary>
/// <param name="countryCode">The two-character country code of a European member country</param>
/// <param name="vatNumber">The VAT number (without the country identification) of a registered company</param>
/// <returns>VatValidationResult</returns>
public static VatValidationResult IsValid(string countryCode, string vatNumber)
{
return(!EUVatValidators.TryGetValue(countryCode, out var validator)
? VatValidationResult.Failed($"{countryCode} is not a valid ISO_3166-1 European member state.")
: validator.Validate(vatNumber));
}