使用 OpenOffice 在 .NET Core 5.0 中将 PPTX 转换为 PDF

要使用 OpenOffice 将 .pptx 文件转换为 PDF 文件，您需要执行以下步骤：

1. 安装 OpenOffice。

2. 在 .NET Core 5.0 应用程序中安装 OpenOffice SDK。

3. 使用 OpenOffice API 打开 .pptx 文件。

4. 使用 OpenOffice API 将 .pptx 文件转换为 PDF 文件。

以下是示例代码：

using System;
using System.IO;
using unoidl.com.sun.star.beans;
using unoidl.com.sun.star.frame;
using unoidl.com.sun.star.lang;
using unoidl.com.sun.star.uno;
using unoidl.com.sun.star.util;

namespace PptxToPdfConverter
{
    class Program
    {
        static void Main(string[] args)
        {
            // Path to the .pptx file
            string pptxFilePath = @"C:\example.pptx";

            // Path to the output PDF file
            string pdfFilePath = @"C:\example.pdf";

            // Create a new instance of the OpenOffice service manager
            Type tServiceManager = Type.GetTypeFromProgID("com.sun.star.ServiceManager");
            XComponentContext context = (XComponentContext)Activator.CreateInstance(tServiceManager);
            XMultiComponentFactory serviceManager = (XMultiComponentFactory)context.getServiceManager();

            // Create a new instance of the Desktop service
            Object desktopService = serviceManager.createInstance("com.sun.star.frame.Desktop");

            // Open the .pptx file
            PropertyValue[] openProps = new PropertyValue[1];
            openProps[0] = new PropertyValue();
            openProps[0].Name = "Hidden";
            openProps[0].Value = new uno.Any(false);
            XComponent pptxComponent = (XComponent)desktopService.GetType().InvokeMember("loadComponentFromURL", System.Reflection.BindingFlags.InvokeMethod, null, desktopService, new Object[] { "file:///" + pptxFilePath.Replace('\', '/'), "_blank", 0, openProps });

            // Create a new instance of the PDF export filter
            Object pdfExportFilter = serviceManager.createInstance("com.sun.star.pdf.PDFExport");

            // Set the export filter options
            PropertyValue[] exportProps = new PropertyValue[2];
            exportProps[0] = new PropertyValue();
            exportProps[0].Name = "FilterName";
            exportProps[0].Value = new uno.Any("writer_pdf_Export");
            exportProps[1] = new PropertyValue();
            exportProps[1].Name = "UseLosslessCompression";
            exportProps[1].Value = new uno.Any(true);
            XPropertySet pdfExportFilterProps = (XPropertySet)pdfExportFilter;
            pdfExportFilterProps.setPropertyValues("", exportProps);

            // Create a new instance of the PDF output stream
            Object pdfOutputStream = serviceManager.createInstance("com.sun.star.io.PdfDocumentOutputStream");

            // Set the PDF output stream path
            PropertyValue[] pdfStreamProps = new PropertyValue[1];
            pdfStreamProps[0] = new PropertyValue();
            pdfStreamProps[0].Name = "OutputStream";
            pdfStreamProps[0].Value = new uno.Any(pdfOutputStream);
            XStorable pdfOutputStreamStorable = (XStorable)pdfOutputStream;
            pdfOutputStreamStorable.storeToURL("file:///" + pdfFilePath.Replace('\', '/'), pdfStreamProps);

            // Export the .pptx file to PDF
            XStorable pptxStorable = (XStorable)pptxComponent;
            pptxStorable.storeToURL("private:stream", exportProps);

            // Close the .pptx file and dispose of the objects
            pptxComponent.dispose();
            pdfOutputStreamStorable = null;
            pdfExportFilterProps = null;
            pdfExportFilter = null;
            desktopService = null;
            serviceManager = null;
            context = null;
        }
    }
}