如何在 .NET Core 中打印 PDF 文件

以下代码片段也适用于 Aspose.PDF.Drawing 库。

在 .NET Core 中打印 PDF 文档

Aspose.PDF 库允许我们将 PDF 文件转换为 XPS。此功能对于组织文档的打印非常有用。让我们看一个使用默认打印机的示例。

在此示例中，我们将 PDF 文档转换为 XPS，并将其作为作业添加到本地打印机的队列中：

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PrintWithNetCore()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Create the secondary thread and pass the printing method for
    // the constructor's ThreadStart delegate parameter.
    var printingThread = new Thread(() => PrintPDF(dataDir + "PrintDocument.pdf"));

    // Set the thread that will use PrintQueue.AddJob to single threading.
    printingThread.SetApartmentState(ApartmentState.STA);

    // Start the printing thread. The method passed to the Thread
    // constructor will execute.
    printingThread.Start();

    // Wait for the printing thread to finish its work
    printingThread.Join();
}

private static void PrintPDF(string pdfFileName)
{
    // Create print server and print queue.
    var defaultPrintQueue = LocalPrintServer.GetDefaultPrintQueue();

    // Convert PDF to XPS
    using (var document = new Aspose.Pdf.Document(pdfFileName))
    {
        var xpsFileName = pdfFileName.Replace(".pdf", ".xps");
        document.Save(xpsFileName, SaveFormat.Xps);

        // Print the Xps file while providing XPS validation and progress notifications.
        using (PrintSystemJobInfo xpsPrintJob = defaultPrintQueue.AddJob(xpsFileName, xpsFileName, false))
        {
            Console.WriteLine(xpsPrintJob.JobIdentifier);
        }
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PrintWithNetCore()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Create the secondary thread and pass the printing method for
    // the constructor's ThreadStart delegate parameter.
    var printingThread = new Thread(() => PrintPDF(dataDir + "PrintDocument.pdf"));

    // Set the thread that will use PrintQueue.AddJob to single threading.
    printingThread.SetApartmentState(ApartmentState.STA);

    // Start the printing thread. The method passed to the Thread
    // constructor will execute.
    printingThread.Start();

    // Wait for the printing thread to finish its work
    printingThread.Join();
}

private static void PrintPDF(string pdfFileName)
{
    // Create print server and print queue.
    var defaultPrintQueue = LocalPrintServer.GetDefaultPrintQueue();

    // Open PDF document
    using var document = new Aspose.Pdf.Document(pdfFileName);

    // Convert PDF to XPS
    var xpsFileName = pdfFileName.Replace(".pdf", ".xps");
    document.Save(xpsFileName,SaveFormat.Xps);

    // Print the Xps file while providing XPS validation and progress notifications.
    using PrintSystemJobInfo xpsPrintJob = defaultPrintQueue.AddJob(xpsFileName, xpsFileName, false);
    Console.WriteLine(xpsPrintJob.JobIdentifier);
}

按 PDF 页面大小选择纸张来源

自 24.4 版本以来，可以在打印对话框中按 PDF 页面大小选择纸张来源。下一个代码片段启用根据 PDF 的页面大小选择打印机托盘。

此偏好可以使用 Document.PickTrayByPdfSize 属性打开和关闭。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PickTrayByPdfSize()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Create PDF document
    using (var document = new Aspose.Pdf.Document())
    {
        // Add page
        var page = document.Pages.Add();
        page.Paragraphs.Add(new Aspose.Pdf.Text.TextFragment("Hello world!"));

        // Set the flag to choose a paper tray using the PDF page size
        document.PickTrayByPdfSize = true;

        // Save PDF document
        document.Save(dataDir + "PickTrayByPdfSize_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PickTrayByPdfSize()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Create PDF document
    using var document = new Aspose.Pdf.Document();

    // Add page
    var page = document.Pages.Add();
    page.Paragraphs.Add(new Aspose.Pdf.Text.TextFragment("Hello world!"));

    // Set the flag to choose a paper tray using the PDF page size
    document.PickTrayByPdfSize = true;

    // Save PDF document
    document.Save(dataDir + "PickTrayByPdfSize_out.pdf");
}

打印对话框预设页面缩放

下一个代码片段旨在确保 PrintScaling 属性正确应用并保存在 PDF 中。

PrintScaling 属性已添加到 Document 类中，值为 Aspose.Pdf.PrintScaling.AppDefault 或 Aspose.Pdf.PrintScaling.None。

在显示此文档的打印对话框时应选择的页面缩放选项。有效值为 None，表示不进行页面缩放，以及 AppDefault，表示符合阅读器的默认打印缩放。如果此条目具有无法识别的值，则应使用 AppDefault。默认值：AppDefault。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void SetPrintScaling()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Create PDF document
    using (var document = new Aspose.Pdf.Document())
    {
        // Add page
        document.Pages.Add();

        // Disable print scaling
        document.PrintScaling = PrintScaling.None;

        // Save PDF document
        document.Save(dataDir + "SetPrintScaling_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void SetPrintScaling()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Create PDF document
    using var document = new Aspose.Pdf.Document();

    // Add page
    document.Pages.Add();

    // Disable print scaling
    document.PrintScaling = PrintScaling.None;

    // Save PDF document
    document.Save(dataDir + "SetPrintScaling_out.pdf");
}

在单个打印作业中打印多个 PDF 文档

有时，需要将多个相关文档作为单个打印作业一起打印。这确保这些文档不会与其他用户的输出交错，特别是在使用远程网络打印机时。Aspose.PDF 支持通过 PdfViewer 类的静态 PrintDocuments 方法在单个打印作业中打印任意数量的文档，使用共享的打印机设置。要打印的文档可以作为文件路径、文档流或 Document 对象提供。

在打印多个文档时，忽略 PrinterSettings.PrintRange 属性，所有文档将全部打印。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PrintingMultipleDocumentsInSingleJob()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Paths to documents to be printed
    var path1 = dataDir + "PrintDocument.pdf";
    var path2 = dataDir + "Print-PageRange.pdf";
    var path3 = dataDir + "35925_1_3.xps";
    
    // Set up printer and page settings
    var printDocument = new System.Drawing.Printing.PrintDocument();
    Aspose.Pdf.Printing.PrinterSettings printerSettings = new Aspose.Pdf.Printing.PrinterSettings();
    printerSettings.PrinterName = printDocument.PrinterSettings.PrinterName;
    
    Aspose.Pdf.Printing.PageSettings pageSettings = new Aspose.Pdf.Printing.PageSettings();
    pageSettings.PaperSize = Aspose.Pdf.Printing.PaperSizes.A4;
    pageSettings.Margins = new Aspose.Pdf.Devices.Margins(0, 0, 0, 0);
    
    // Print multiple documents in a single print job
    Aspose.Pdf.Facades.PdfViewer.PrintDocuments(printerSettings, pageSettings, path1, path2, path3);
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PrintingMultipleDocumentsInSingleJob()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdfFacades_Printing();

    // Paths to documents to be printed
    var path1 = dataDir + "PrintDocument.pdf";
    var path2 = dataDir + "Print-PageRange.pdf";
    var path3 = dataDir + "35925_1_3.xps";
    
    // Set up printer and page settings
    var printDocument = new System.Drawing.Printing.PrintDocument();
    Aspose.Pdf.Printing.PrinterSettings printerSettings = new Aspose.Pdf.Printing.PrinterSettings
    {
        PrinterName = printDocument.PrinterSettings.PrinterName
    };
    
    Aspose.Pdf.Printing.PageSettings pageSettings = new Aspose.Pdf.Printing.PageSettings
    {
        PaperSize = Aspose.Pdf.Printing.PaperSizes.A4,
        Margins = new Aspose.Pdf.Devices.Margins(0, 0, 0, 0)
    };
    
    // Print multiple documents in a single print job
    Aspose.Pdf.Facades.PdfViewer.PrintDocuments(printerSettings, pageSettings, path1, path2, path3);
}