PrintQueueCollection.GetEnumerator Metoda

public:
 virtual System::Collections::Generic::IEnumerator<System::Printing::PrintQueue ^> ^ GetEnumerator();

public virtual System.Collections.Generic.IEnumerator<System.Printing.PrintQueue> GetEnumerator ();

abstract member GetEnumerator : unit -> System.Collections.Generic.IEnumerator<System.Printing.PrintQueue>
override this.GetEnumerator : unit -> System.Collections.Generic.IEnumerator<System.Printing.PrintQueue>

Public Overridable Function GetEnumerator () As IEnumerator(Of PrintQueue)

Zwraca

IEnumerator<PrintQueue>

Obiekt, który implementuje rodzajowy IEnumerator i który może przechodzić przez PrintQueue obiekty, które PrintQueueCollection zawiera.An object that implements the generic IEnumerator and that can iterate through the PrintQueue objects that the PrintQueueCollection contains.

Implementuje

Przykłady

Poniższy przykład pokazuje, jak używać tej metody do testowania możliwości drukarki i konfigurowania zadania drukowania, aby korzystać z nich.The following example shows how to use this method to test a printer's capabilities and configure a print job to take advantage of them.

// ---------------------- GetPrintTicketFromPrinter -----------------------
/// <summary>
///   Returns a PrintTicket based on the current default printer.</summary>
/// <returns>
///   A PrintTicket for the current local default printer.</returns>
PrintTicket^ GetPrintTicketFromPrinter ()
{
   PrintQueue^ printQueue = nullptr;

   LocalPrintServer^ localPrintServer = gcnew LocalPrintServer();

   // Retrieving collection of local printer on user machine
   PrintQueueCollection^ localPrinterCollection = localPrintServer->GetPrintQueues();

   System::Collections::IEnumerator^ localPrinterEnumerator = localPrinterCollection->GetEnumerator();

   if (localPrinterEnumerator->MoveNext())
   {
      // Get PrintQueue from first available printer
      printQueue = ((PrintQueue^)localPrinterEnumerator->Current);
   } else
   {
      return nullptr;
   }
   // Get default PrintTicket from printer
   PrintTicket^ printTicket = printQueue->DefaultPrintTicket;

   PrintCapabilities^ printCapabilities = printQueue->GetPrintCapabilities();

   // Modify PrintTicket
   if (printCapabilities->CollationCapability->Contains(Collation::Collated))
   {
      printTicket->Collation = Collation::Collated;
   }
   if (printCapabilities->DuplexingCapability->Contains(Duplexing::TwoSidedLongEdge))
   {
      printTicket->Duplexing = Duplexing::TwoSidedLongEdge;
   }
   if (printCapabilities->StaplingCapability->Contains(Stapling::StapleDualLeft))
   {
      printTicket->Stapling = Stapling::StapleDualLeft;
   }
   return printTicket;
};// end:GetPrintTicketFromPrinter()

// ---------------------- GetPrintTicketFromPrinter -----------------------
/// <summary>
///   Returns a PrintTicket based on the current default printer.</summary>
/// <returns>
///   A PrintTicket for the current local default printer.</returns>
private PrintTicket GetPrintTicketFromPrinter()
{
    PrintQueue printQueue = null;

    LocalPrintServer localPrintServer = new LocalPrintServer();

    // Retrieving collection of local printer on user machine
    PrintQueueCollection localPrinterCollection =
        localPrintServer.GetPrintQueues();

    System.Collections.IEnumerator localPrinterEnumerator =
        localPrinterCollection.GetEnumerator();

    if (localPrinterEnumerator.MoveNext())
    {
        // Get PrintQueue from first available printer
        printQueue = (PrintQueue)localPrinterEnumerator.Current;
    }
    else
    {
        // No printer exist, return null PrintTicket
        return null;
    }

    // Get default PrintTicket from printer
    PrintTicket printTicket = printQueue.DefaultPrintTicket;

    PrintCapabilities printCapabilities = printQueue.GetPrintCapabilities();

    // Modify PrintTicket
    if (printCapabilities.CollationCapability.Contains(Collation.Collated))
    {
        printTicket.Collation = Collation.Collated;
    }

    if ( printCapabilities.DuplexingCapability.Contains(
            Duplexing.TwoSidedLongEdge) )
    {
        printTicket.Duplexing = Duplexing.TwoSidedLongEdge;
    }

    if (printCapabilities.StaplingCapability.Contains(Stapling.StapleDualLeft))
    {
        printTicket.Stapling = Stapling.StapleDualLeft;
    }

    return printTicket;
}// end:GetPrintTicketFromPrinter()

' ---------------------- GetPrintTicketFromPrinter -----------------------
''' <summary>
'''   Returns a PrintTicket based on the current default printer.</summary>
''' <returns>
'''   A PrintTicket for the current local default printer.</returns>
Private Function GetPrintTicketFromPrinter() As PrintTicket
    Dim printQueue As PrintQueue = Nothing

    Dim localPrintServer As New LocalPrintServer()

    ' Retrieving collection of local printer on user machine
    Dim localPrinterCollection As PrintQueueCollection = localPrintServer.GetPrintQueues()

    Dim localPrinterEnumerator As System.Collections.IEnumerator = localPrinterCollection.GetEnumerator()

    If localPrinterEnumerator.MoveNext() Then
        ' Get PrintQueue from first available printer
        printQueue = CType(localPrinterEnumerator.Current, PrintQueue)
    Else
        ' No printer exist, return null PrintTicket
        Return Nothing
    End If

    ' Get default PrintTicket from printer
    Dim printTicket As PrintTicket = printQueue.DefaultPrintTicket

    Dim printCapabilities As PrintCapabilities = printQueue.GetPrintCapabilities()

    ' Modify PrintTicket
    If printCapabilities.CollationCapability.Contains(Collation.Collated) Then
        printTicket.Collation = Collation.Collated
    End If

    If printCapabilities.DuplexingCapability.Contains(Duplexing.TwoSidedLongEdge) Then
        printTicket.Duplexing = Duplexing.TwoSidedLongEdge
    End If

    If printCapabilities.StaplingCapability.Contains(Stapling.StapleDualLeft) Then
        printTicket.Stapling = Stapling.StapleDualLeft
    End If

    Return printTicket
End Function ' end:GetPrintTicketFromPrinter()

Uwagi

Zalecamy używanie foreach instrukcji do iteracji wszystkich elementów członkowskich kolekcji.We recommend that you use the foreach statement to iterate through all members of the collection. Należy używać GetEnumerator tylko wtedy, gdy trzeba dostosować iteracje, na przykład przez pominięcie każdego innego elementu członkowskiego.Use GetEnumerator only when you need to customize iteration, such as by skipping every other member.

Dotyczy