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。下一个代码片段使得可以根据 PDF 的页面大小选择打印机托盘。

此偏好可以通过 Document.PickTrayByPdfSize 属性开启和关闭。

.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。

在为此文档显示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");
}