VSTO OpenXml C# - 在运行时编辑 PowerPoint

Question

我读过很多关于用 OpenXml 编辑 pptx 文件的文章

PresentationDocument presentationDocument = PresentationDocument.Open("C:\\Users\\beggers\\Desktop\\Test.pptx", true)

但是如何在运行时修改幻灯片/演示文稿的 XML 数据？特别是当我运行一个新的演示文稿时，女巫没有保存。

我正在开发 C# VSTO 插件，我想以某种方式修改我的幻灯片/xml，这是 Microsoft.Office.Interop 不支持的。

Answer 1

不幸的是，Microsoft Word 是唯一提供用于读取甚至写入 Open XML 标记的互操作 API 的 Office 应用程序，在这种情况下，给定的 Range 对象（也可以是代表整个主文档的 Range部分）。 Excel 和 PowerPoint 都没有提供这种功能。

不过，即使 Microsoft Word 也不会为您提供完整的标记，这意味着您无法通过阅读或更改 Open XML 标记来阅读或更改已打开文档的各个方面。因此，根据您希望对文档执行的操作，您甚至必须关闭并重新打开 Word 文档才能访问和处理完整的 Open XML 标记。

Answer 2

一种次优但实用的方法是使用剪贴板进行往返。复制到剪贴板的幻灯片实际上被打包为 ppt 数据（只是一个 zip）。你可以控制剪贴板和插入等幻灯片。所以基本上：

1. 使用 PP API 以编程方式选择要编辑的内容并将其复制到剪贴板。
2. 将剪贴板数据的“PowerPoint 14.0 Slides Package”部分读入内存流。
3. 使用 Open XML 传递/编辑内存流。
4. 将内存流复制回剪贴板。
5. 根据需要粘贴回 PP。

以下是步骤 2-3 的示例，使用 this Open XML 示例作为基础，将剪贴板中第一张幻灯片中的所有文本写入控制台：

using System;
using System.IO; 
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Drawing;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Presentation;
using P = DocumentFormat.OpenXml.Presentation;
using D = DocumentFormat.OpenXml.Drawing;
using DocumentFormat.OpenXml.Office2016.Drawing.ChartDrawing;

namespace PPClipboardTest
{    
    class Program
    {
        public static string format = "PowerPoint 14.0 Slides Package";


        // Get all the text in a slide.
        public static string[] GetAllTextInSlide(string presentationFile, int slideIndex)
        {
            // Open the presentation as read-only.
            using (PresentationDocument presentationDocument = PresentationDocument.Open(presentationFile, false))
            {
                // Pass the presentation and the slide index
                // to the next GetAllTextInSlide method, and
                // then return the array of strings it returns. 
                return GetAllTextInSlide(presentationDocument, slideIndex);
            }
        }

        public static string[] GetAllTextInSlide(PresentationDocument presentationDocument, int slideIndex)
        {
            // Verify that the presentation document exists.
            if (presentationDocument == null)
            {
                throw new ArgumentNullException("presentationDocument");
            }

            // Verify that the slide index is not out of range.
            if (slideIndex < 0)
            {
                throw new ArgumentOutOfRangeException("slideIndex");
            }

            // Get the presentation part of the presentation document.
            PresentationPart presentationPart = presentationDocument.PresentationPart;

            // Verify that the presentation part and presentation exist.
            if (presentationPart != null && presentationPart.Presentation != null)
            {
                // Get the Presentation object from the presentation part.
                Presentation presentation = presentationPart.Presentation;

                // Verify that the slide ID list exists.
                if (presentation.SlideIdList != null)
                {
                    // Get the collection of slide IDs from the slide ID list.
                    DocumentFormat.OpenXml.OpenXmlElementList slideIds =
                        presentation.SlideIdList.ChildElements;

                    // If the slide ID is in range...
                    if (slideIndex < slideIds.Count)
                    {
                        // Get the relationship ID of the slide.
                        string slidePartRelationshipId = (slideIds[slideIndex] as SlideId).RelationshipId;

                        // Get the specified slide part from the relationship ID.
                        SlidePart slidePart =
                            (SlidePart)presentationPart.GetPartById(slidePartRelationshipId);

                        // Pass the slide part to the next method, and
                        // then return the array of strings that method
                        // returns to the previous method.
                        return GetAllTextInSlide(slidePart);
                    }
                }
            }

            // Else, return null.
            return null;
        }

        public static string[] GetAllTextInSlide(SlidePart slidePart)
        {
            // Verify that the slide part exists.
            if (slidePart == null)
            {
                throw new ArgumentNullException("slidePart");
            }

            // Create a new linked list of strings.
            LinkedList<string> texts = new LinkedList<string>();

            // If the slide exists...
            if (slidePart.Slide != null)
            {
                // Iterate through all the paragraphs in the slide.
                foreach (DocumentFormat.OpenXml.Drawing.Paragraph paragraph in
                    slidePart.Slide.Descendants<DocumentFormat.OpenXml.Drawing.Paragraph>())
                {
                    // Create a new string builder.                    
                    StringBuilder paragraphText = new StringBuilder();

                    // Iterate through the lines of the paragraph.
                    foreach (DocumentFormat.OpenXml.Drawing.Text text in
                        paragraph.Descendants<DocumentFormat.OpenXml.Drawing.Text>())
                    {
                        // Append each line to the previous lines.
                        paragraphText.Append(text.Text);
                    }

                    if (paragraphText.Length > 0)
                    {
                        // Add each paragraph to the linked list.
                        texts.AddLast(paragraphText.ToString());
                    }
                }
            }

            if (texts.Count > 0)
            {
                // Return an array of strings.
                return texts.ToArray();
            }
            else
            {
                return null;
            }
        }



        [STAThread]
        static void Main(string[] args)
        {
            IDataObject iData = new DataObject();

            iData = Clipboard.GetDataObject();
            string[] formats = iData.GetFormats();

            foreach(string f in formats)
            {
                if(f == format)
                {
                    MemoryStream ms = iData.GetData(format) as MemoryStream;

                    using (PresentationDocument pres = PresentationDocument.Open(ms, true))
                    {
                        string[] allText = GetAllTextInSlide(pres, 0);
                        Console.Write("Text in first slide copied to clipboard:\n");
                        foreach (string txt in allText)
                        {
                            
                            Console.Write(txt + "\n");
                        }
                    }

                    /*
                    // Write to file
                    using (FileStream file = new FileStream("file.ppt", FileMode.Create, System.IO.FileAccess.Write)) // Bin chunk from clipboard is just a zip file
                    {
                        byte[] bytes = new byte[ms.Length];
                        ms.Read(bytes, 0, (int)ms.Length);
                        file.Write(bytes, 0, bytes.Length);
                        ms.Close();
                    }
                    */


                    break;
                }
            }            
        }
    }
}