private static Func <object, ValidationResult> BuildValidator(string defaultValue, IInputValidator validator)
{
return(x => {
var value =
x is string && string.IsNullOrEmpty((string)x) &&
!string.IsNullOrEmpty(defaultValue)
? defaultValue
: x;
var validation = validator.GetValidation(value);
return validation == null ? null : new ValidationResult(validation);
});
}