public async Task <IEnumerable <ChatMessageDTO> > GetAllMessagesBySessionId(Guid sessionId) { _logger.Info(String.Format($"{"ChatService",-20} >>> {"GetAllMessagesBySessionId",-20} >>> {"Start",-10} >>> {"SessionId",-10}{sessionId}")); IEnumerable <ChatMessageDTO> result = null; //if (sessionId == null || sessionId == Guid.Empty) // return result; result = await _chatRepository.GetAllMessagesBySessionId(sessionId); _logger.Debug($"{"ChatService:",-20} >>> {"GetAllMessagesBySessionId",-20} >>> {"Result:",-10} {JsonConvert.SerializeObject(result)}, {"SessionId:",-10}{sessionId}."); return(result); }