public bool IsValidForCharacter([NotNull] CharacterInfo character)
{
if (character == null)
{
throw new ArgumentNullException(nameof(character));
}
var fieldValues = character.Fields.SingleOrDefault(f => f.FieldId == FieldId)?.FieldValue?.Split(',');
var allowByField = FieldId == 0 || AllowedValues.Intersect(fieldValues ?? Enumerable.Empty <string>()).Any();
var allowByGroup = ShowForGroups.Length == 0 ||
ShowForGroups.Intersect(character.Groups.Select(g => g.CharacterGroupId)).Any();
var disallowByGroup = SkipForGroups.Intersect(character.Groups.Select(g => g.CharacterGroupId)).Any();
return(allowByField && allowByGroup && !disallowByGroup);
}