在 WPF 应用程序中打印 PDF

以下代码片段也适用于 Aspose.PDF.Drawing 库。

直接打印

Aspose.PDF 库具有将 PDF 文件转换为 XPS 的能力。我们可以使用此功能来组织文档的打印。 让我们考虑直接打印的示例：

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void DirectPrintWpf()
{
    // Select a PDF document to print
    var openFileDialog = new OpenFileDialog
    {
        Filter = "PDF Documents|*.pdf"
    };

    if (openFileDialog.ShowDialog() == true)
    {
        // Open PDF document
        using (var document = new Aspose.Pdf.Document(openFileDialog.FileName))
        {
            using (var memoryStream = new MemoryStream())
            {
                // Convert the document to the XPS format
                document.Save(memoryStream, SaveFormat.Xps);
        
                // Create XPS package
                using (var package = Package.Open(memoryStream))
                {
                    //Create URI for the XPS package
                    //Any Uri will actually be fine here. It acts as a placeholder for the
                    //Uri of the package inside the PackageStore
                    var inMemoryPackageName = $"memorystream://{Guid.NewGuid()}.xps";
                    var packageUri = new Uri(inMemoryPackageName);
        
                    //Add the package to PackageStore
                    PackageStore.AddPackage(packageUri, package);
        
                    // Open the XPS document from the package
                    using (var xpsDoc = new XpsDocument(package, CompressionOption.Maximum, inMemoryPackageName))
                    {
                        // Get the root document sequence
                        var fixedDocumentSequence = xpsDoc.GetFixedDocumentSequence();
        
                        // Open a print dialog to set printing options
                        var printDialog = new PrintDialog();
                        if (printDialog.ShowDialog() == true)
                        {
                            if (fixedDocumentSequence != null)
                            {
                                // Print converted document
                                printDialog.PrintDocument(fixedDocumentSequence.DocumentPaginator,
                                    "A fixed document");
                            }
                        }
        
                        // Remove the package from the store and close the document after the print
                        PackageStore.RemovePackage(packageUri);
                    }
                }
            }
        }
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void DirectPrintWpf()
{
    // Select a PDF document to print
    var openFileDialog = new OpenFileDialog
    {
        Filter = "PDF Documents|*.pdf"
    };

    if (openFileDialog.ShowDialog())
    {
        // Open PDF document
        using var document = new Aspose.Pdf.Document(openFileDialog.FileName);
        
        // Convert the document to the XPS format
        using var memoryStream = new MemoryStream();
        document.Save(memoryStream, SaveFormat.Xps);
        
        // Create XPS package
        using var package = Package.Open(memoryStream);
        
        //Create URI for the XPS package
        //Any Uri will actually be fine here. It acts as a placeholder for the
        //Uri of the package inside the PackageStore
        var inMemoryPackageName = $"memorystream://{Guid.NewGuid()}.xps";
        var packageUri = new Uri(inMemoryPackageName);
        
        //Add the package to PackageStore
        PackageStore.AddPackage(packageUri, package);
        
        // Open the XPS document from the package
        using var xpsDoc = new XpsDocument(package, CompressionOption.Maximum, inMemoryPackageName);
        
        // Get the root document sequence
        var fixedDocumentSequence = xpsDoc.GetFixedDocumentSequence();
        
        // Open a print dialog to set printing options
        var printDialog = new PrintDialog();
        if (printDialog.ShowDialog() == true)
        {
            if (fixedDocumentSequence != null)
            {
                // Print converted document
                printDialog.PrintDocument(fixedDocumentSequence.DocumentPaginator,
                    "A fixed document");
            }
        }
        
        // Remove the package from the store and close the document after the print
        PackageStore.RemovePackage(packageUri);
    }
}

在这种情况下，我们将遵循以下步骤：

1. 使用 OpenFileDialog 打开 PDF 文件。
2. 将 PDF 转换为 XPS 并存储在 MemoryStream 对象中。
3. 将 MemoryStream 对象与 Xps 包关联。
4. 将包添加到包存储中。
5. 基于包创建 XpsDocument。
6. 获取 FixedDocumentSequence 的实例。
7. 使用 PrintDialog 将此序列发送到打印机。

查看和打印文档

在许多情况下，用户希望在打印之前查看文档。为了实现查看功能，我们可以使用 DocumentViewer 控件。 实现此方法的大部分步骤与前面的示例类似。

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PreviewDocumentWithDocumentViewer(DocumentViewer docViewer)
{
    // Select a PDF document to print
    var openFileDialog = new OpenFileDialog
    {
        Filter = "PDF Documents|*.pdf"
    };

    if (openFileDialog.ShowDialog() == true)
    {
        // Open PDF document
        using (var document = new Aspose.Pdf.Document(openFileDialog.FileName))
        {
            using (var memoryStream = new MemoryStream())
            {
                // Convert the document to the XPS format
                document.Save(memoryStream, SaveFormat.Xps);

                // Create XPS package
                using (var package = Package.Open(memoryStream))
                {
                    //Create URI for the XPS package
                    var inMemoryPackageName = $"memorystream://{Guid.NewGuid()}.xps";
                    var packageUri = new Uri(inMemoryPackageName);

                    //Add package to PackageStore
                    PackageStore.AddPackage(packageUri, package);

                    // Open the XPS document from the package
                    using (var xpsDoc = new XpsDocument(package, CompressionOption.Maximum, inMemoryPackageName))
                    {
                        // Display the document in the DocumentViewer
                        docViewer.Document = xpsDoc.GetFixedDocumentSequence();
                    }
                }
            }
        }
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void PreviewDocumentWithDocumentViewer(DocumentViewer docViewer)
{
    // Select a PDF document to print
    var openFileDialog = new OpenFileDialog
    {
        Filter = "PDF Documents|*.pdf"
    };

    if (openFileDialog.ShowDialog() == true)
    {
        // Open PDF document
        using var document = new Aspose.Pdf.Document(openFileDialog.FileName);

        // Convert the document to the XPS format
        using var memoryStream = new MemoryStream();
        document.Save(memoryStream, SaveFormat.Xps);

        // Create XPS package
        using var package = Package.Open(memoryStream);

        //Create URI for the XPS package
        var inMemoryPackageName = $"memorystream://{Guid.NewGuid()}.xps";
        var packageUri = new Uri(inMemoryPackageName);

        //Add package to PackageStore
        PackageStore.AddPackage(packageUri, package);

        // Open the XPS document from the package
        using var xpsDoc = new XpsDocument(package, CompressionOption.Maximum, inMemoryPackageName);

        // Display the document in the DocumentViewer
        docViewer.Document = xpsDoc.GetFixedDocumentSequence();
    }
}