/// <summary>
        /// 取消打印任务
        /// </summary>
        /// <param name="printJobID">任务ID</param>
        /// <returns></returns>
        protected bool CancelPrintJob(int printJobID)
        {
            bool isActionPerformed = false;
            string searchQuery;
            String jobName;
            char[] splitArr;
            int prntJobID;
            ManagementObjectSearcher searchPrintJobs;
            ManagementObjectCollection prntJobCollection;
            try
            {
                searchQuery = "SELECT * FROM Win32_PrintJob";
                searchPrintJobs = new ManagementObjectSearcher(searchQuery);
                prntJobCollection = searchPrintJobs.Get();
                foreach (ManagementObject prntJob in prntJobCollection)
                {
                    jobName = prntJob.Properties["Name"].Value.ToString();
                    splitArr = new char[1];
                    splitArr[0] = Convert.ToChar(",");
                    prntJobID = Convert.ToInt32(jobName.Split(splitArr)[1]);
                    if (prntJobID == printJobID)
                    {
                        prntJob.Delete();
                        isActionPerformed = true;
                        break;
                    }
                }
                return isActionPerformed;
            }
            catch (Exception sysException)
            {
                Log.Error(sysException);
                return false;
            }
        }
        /// <summary>
        /// 获取本地打印机的打印任务集合
        /// </summary>
        /// <param name="PrinterName"></param>
        /// <returns></returns>
        protected Dictionary<string, int> GetPrintQueue(string PrinterName)
        {
            Dictionary<string, int> tempDict = new Dictionary<string, int>();
            LocalPrintServer pr = new LocalPrintServer();
            pr.Refresh();
            EnumeratedPrintQueueTypes[] enumerationFlags =
            {
                EnumeratedPrintQueueTypes.Local,
                EnumeratedPrintQueueTypes.Connections,
            };
            foreach (PrintQueue pq in pr.GetPrintQueues(enumerationFlags))
            {
                if (pq.Name == PrinterName && pq.NumberOfJobs > 0)
                {
                    var jobs = pq.GetPrintJobInfoCollection();
                    foreach (var job in jobs)
                    {
                        tempDict.Add(job.Name +"_"+ job.JobIdentifier.ToString(), job.JobIdentifier);
                    }
                }
            }
            return tempDict;
        }