TSVCEO.CloudPrint.Proxy.CloudPrintProxy.UpdatePrintQueues C# (CSharp) Method

        private IEnumerable<CloudPrinter> UpdatePrintQueues()
        {
            if (PrintQueuesLastUpdated + PrintQueueUpdateInterval - TimeSpan.FromSeconds(5) < DateTime.Now)
            {
                try
                {
                    Dictionary<string, string> printerIds;

                    if (_Queues.Count == 0)
                    {
                        IEnumerable<dynamic> printers = HTTPHelper.PostCloudPrintUrlEncodedRequest(OAuthTicket, "list", new { proxy = Config.CloudPrintProxyID }).printers;
                        printerIds = printers.ToDictionary(p => (string)p.name, p => (string)p.id);
                    }
                    else
                    {
                        printerIds = _Queues.ToDictionary(p => p.Name, p => p.PrinterID);
                    }

                    List<CloudPrinter> queues = new List<CloudPrinter>();

                    foreach (CloudPrinter queue in PrintJobProcessor.GetPrintQueues())
                    {
                        if (!printerIds.ContainsKey(queue.Name))
                        {
                            RegisterCloudPrinter(queue);
                        }
                        else
                        {
                            queue.SetPrinterID(printerIds[queue.Name]);
                            UpdateCloudPrinter(queue);
                        }

                        queues.Add(queue);
                    }

                    foreach (KeyValuePair<string, string> printer_kvp in printerIds)
                    {
                        if (queues.Count(q => q.PrinterID == printer_kvp.Value) == 0)
                        {
                            DeleteCloudPrinter(printer_kvp.Value);
                        }
                    }

                    _Queues = queues;

                    PrintQueuesLastUpdated = DateTime.Now;

                    UpdateCloudPrintJobs();

                    return queues.AsEnumerable();
                }
                catch (Exception ex)
                {
                    Logger.Log(LogLevel.Warning, "Caught exception while updating printer queues:\n{0}", ex.ToString());
                    return _Queues.AsEnumerable();
                }
            }
            else
            {
                return _Queues.AsEnumerable();
            }
        }