private void MapToRepresentation(Exception e, HttpRequestMessage req) { if (e is WithContextNOSException) { ArgumentsRepresentation.Format format = e is BadPersistArgumentsException ? ArgumentsRepresentation.Format.Full : ArgumentsRepresentation.Format.MembersOnly; RestControlFlags flags = e is BadPersistArgumentsException ? ((BadPersistArgumentsException)e).Flags : RestControlFlags.DefaultFlags(); var contextNosException = e as WithContextNOSException; if (contextNosException.Contexts.Any(c => c.ErrorCause == Cause.Disabled || c.ErrorCause == Cause.Immutable)) { representation = NullRepresentation.Create(); } else if (contextNosException.ContextSurface != null) { representation = ArgumentsRepresentation.Create(req, contextNosException.ContextSurface, format, flags, UriMtHelper.GetJsonMediaType(RepresentationTypes.BadArguments)); } else if (contextNosException.Contexts.Any()) { representation = ArgumentsRepresentation.Create(req, contextNosException.Contexts, format, flags, UriMtHelper.GetJsonMediaType(RepresentationTypes.BadArguments)); } else { representation = NullRepresentation.Create(); } } else if (e is ResourceNotFoundNOSException || e is NotAllowedNOSException || e is PreconditionFailedNOSException || e is PreconditionHeaderMissingNOSException || e is NoContentNOSException) { representation = NullRepresentation.Create(); } else { representation = ErrorRepresentation.Create(e); } }