Quel est le but de suffixes .RequiredError, .FormatError, etc.

Question

La lecture du code source Oxite, j'ai trouvé que validateurs sauver mauvais nom de la propriété avec des suffixes (RequiredError, MaxLengthExceededError, InvalidError, formatError)

validationState.Errors.Add(CreateValidationError(user.Name, "Name.RequiredError", "Name is not set"));

validationState.Errors.Add(CreateValidationError(user.Name, "Name.MaxLengthExceededError", "Username must be less than or equal to {0} characters long.", 256));

validationState.Errors.Add(CreateValidationError(user.Email, "Email.InvalidError", "Email is invalid."));

Quel est le but dont suffixes? Comment les utiliser?

Answer 1

My guess is that they're constant, machine-friendly values that can be used to uniquely identify the error and can be used to fetch localized resources for your globalized site.

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I'm a good guesser:

    protected ValidationError CreateValidationError(
        object value, string validationKey, string validationMessage, 
        params object[] validationMessageParameters)
    {
        if (validationMessageParameters != null && 
            validationMessageParameters.Length > 0)
        {
            validationMessage = string.Format(
              validationMessage, validationMessageParameters);
        }

        return new ValidationError(
            validationKey,
            value,
            new InvalidOperationException(
              localize(validationKey, validationMessage))
            );
    }

    private string localize(string key, string defaultValue)
    {
        if (phrases == null)
            phrases = localizationService.GetTranslations();

        Phrase foundPhrase = phrases
          .Where(p => p.Key == key && p.Language == site.LanguageDefault)
          .FirstOrDefault();

        if (foundPhrase != null)
            return foundPhrase.Value;

        return defaultValue;
    }

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Curious, though. Since exceptions generally shouldn't be localized.