C#打印队列ID问题

Question

我之前用这种方法得到ID，但是不正确
            LocalPrintServer ps = new LocalPrintServer();
            PrintQueueCollection queue = ps.GetPrintQueues();
            foreach (PrintQueue pq in queue)
            {
                pq.Refresh();
                if (pq.NumberOfJobs > 0)
                {
                    try
                    {
                        PrintJobInfoCollection jobs = pq.GetPrintJobInfoCollection();
                        if (jobs!=null)
                        {
                            foreach (PrintSystemJobInfo job in jobs)
                            {
                                job.Refresh();
                                CancelPrintJob(job.PositionInPrintQueue);
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                    }
                }
            }

Answer 1

下面是获取打印任务的代码，从队列集合中取出任务名字或者ID，然后调用取消函数
How to get Printer Submitted Jobs in C# ?#region GetPrintJobsCollection        /// <summary>
        /// Returns the jobs in printer queue
        /// </summary>
        /// <param name="printerName">Printer Name.</param>
        /// <returns>StringCollection</returns>
        public StringCollection GetPrintJobsCollection(string printerName)
        {
            StringCollection printJobCollection = new StringCollection();
            try
            {
                //Query the printer to get the files waiting to print.
                string searchQuery = "SELECT * FROM Win32_PrintJob";                ManagementObjectSearcher searchPrintJobs = new ManagementObjectSearcher(searchQuery);
                ManagementObjectCollection prntJobCollection = searchPrintJobs.Get();
                foreach (ManagementObject prntJob in prntJobCollection)
                {
                    String jobName = prntJob.Properties["Name"].Value.ToString();                    //Job name would be of the format [Printer name], [Job ID]
                    char[] splitArr = new char[1];
                    splitArr[0] = Convert.ToChar(",");
                    string prnName = jobName.Split(splitArr)[0];
                    string documentName = prntJob.Properties["Document"].Value.ToString();
                    if (String.Compare(prnName, printerName, true) == 0)
                    {
                        printJobCollection.Add(documentName);
                    }
                }
            }
            catch (Exception ex)
            {
                // Log the exception.
            }
            return printJobCollection;
        }        #endregion GetPrintJobsCollection
How to Cancel Printing in C# ?#region CancelPrintJob        /// <summary>
        /// Cancel the print job. This functions accepts the job number.
        /// An exception will be thrown if access denied.
        /// </summary>
        /// <param name="printJobID">int: Job number to cancel printing for.</param>
        /// <returns>bool: true if cancel successfull, else false.</returns>
        public bool CancelPrintJob(int printJobID)
        {
            // Variable declarations.
            bool isActionPerformed = false;
            string searchQuery;
            String jobName;
            char[] splitArr;
            int prntJobID;
            ManagementObjectSearcher searchPrintJobs;
            ManagementObjectCollection prntJobCollection;
            try
            {
                // Query to get all the queued printer jobs.
                searchQuery = "SELECT * FROM Win32_PrintJob";
                // Create an object using the above query.
                searchPrintJobs = new ManagementObjectSearcher(searchQuery);
                // Fire the query to get the collection of the printer jobs.
                prntJobCollection = searchPrintJobs.Get();                // Look for the job you want to delete/cancel.
                foreach (ManagementObject prntJob in prntJobCollection)
                {
                    jobName = prntJob.Properties["Name"].Value.ToString();
                    // Job name would be of the format [Printer name], [Job ID]
                    splitArr = new char[1];
                    splitArr[0] = Convert.ToChar(",");
                    // Get the job ID.
                    prntJobID = Convert.ToInt32(jobName.Split(splitArr)[1]);
                    // If the Job Id equals the input job Id, then cancel the job.
                    if (prntJobID == printJobID)
                    {
                        // Performs a action similar to the cancel
                        // operation of windows print console
                        prntJob.Delete();
                        isActionPerformed = true;
                        break;
                    }
                }
                return isActionPerformed;
            }
            catch (Exception sysException)
            {
                // Log the exception.
                return false;
            }
        }        #endregion CancelPrintJob