/// <inheritdoc/>
public string ToDelimitedString()
{
CultureInfo culture = CultureInfo.CurrentCulture;
return(string.Format(
culture,
StringHelper.StringFormatSequence(0, 5, Configuration.FieldSeparator),
Id,
SetIdLan.HasValue ? SetIdLan.Value.ToString(culture) : null,
LanguageCode?.ToDelimitedString(),
LanguageAbilityCode != null ? string.Join(Configuration.FieldRepeatSeparator, LanguageAbilityCode.Select(x => x.ToDelimitedString())) : null,
LanguageProficiencyCode?.ToDelimitedString()
).TrimEnd(Configuration.FieldSeparator.ToCharArray()));
}