每次 ManagementEventWatcher 发生更改时，我都会查询 Win32_PrintJob WMI 类，我获得了有关它的数据，例如：Document、HostPrintQueue、JobId、JobStatus、TotalPages 等。但 TotalPages 并不代表要打印的实际页数, 似乎目前获取这些数据的时候，打印作业还没有完成处理，并且在那一刻转移了要打印的页数，但实际总数是其他数字，完成后如何获得打印作业的实际数量处理？这是我的代码：
ManagementEventWatcher createPrintJobWatcher;
String strComputerName = ".";
// Create event query to be notified within 1 milli second of a change in a service
WqlEventQuery createPrintJobQuery = new WqlEventQuery("SELECT * FROM __InstanceCreationEvent WITHIN 0.001 WHERE TargetInstance ISA \"Win32_PrintJob\"");
createPrintJobWatcher = new ManagementEventWatcher();
createPrintJobWatcher.Scope = new ManagementScope("\\\\" + strComputerName + "\\root\\CIMV2");
createPrintJobWatcher.Query = createPrintJobQuery;
// times out watcher.WaitForNextEvent in 1 seconds
createPrintJobWatcher.Options.Timeout = new TimeSpan(0, 0, 1);
//set the print event handler
createPrintJobWatcher.EventArrived += new EventArrivedEventHandler(createPrintJobListener);
createPrintJobWatcher.Start();
Console.WriteLine("Listening...");
Console.ReadLine();
createPrintJobListener 方法：
static void createPrintJobListener(object sender, EventArrivedEventArgs e)
{
SelectQuery query = new SelectQuery("Win32_PrintJob");
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(query))
using (ManagementObjectCollection printJobs = searcher.Get())
foreach (ManagementObject printJob in printJobs)
{
Console.WriteLine("c1:", printJob);
Console.WriteLine("ID: {0}", printJob.GetPropertyValue("JobId").ToString());
Console.WriteLine("name: {0}", printJob.GetPropertyValue("name").ToString());
Console.WriteLine("status: {0}", printJob.GetPropertyValue("status").ToString());
if (printJob.GetPropertyValue("JobStatus") != null)
{
Console.WriteLine("JobStatus: {0}", printJob.GetPropertyValue("JobStatus").ToString());
}
else
{
Console.WriteLine("JobStatus: NULLLLLL");
}
Console.WriteLine("PC: {0}", printJob.GetPropertyValue("HostPrintQueue").ToString());
Console.WriteLine("TOTOAL PAGES: {0}", printJob.GetPropertyValue("TotalPages").ToString());
}
}