使用OpenXML SDK将RTF文件的内容嵌入到DOCX文件中

using System;
using System.IO;
using System.Windows.Forms;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;

namespace RTFToDOCX
{
    class Program
    {
        static void Main(string[] args)
        {
            string rtfFilePath = "example.rtf";
            string docxFilePath = "example.docx";

            // 读取RTF文件
            RichTextBox rtb = new RichTextBox();
            rtb.LoadFile(rtfFilePath);

            // 将RTF文件转换为Word文档
            byte[] wordDocument = ConvertRtfToWord(rtb.Rtf);

            // 将转换后的Word文档嵌入到DOCX文件中
            using (WordprocessingDocument wordprocessingDocument = WordprocessingDocument.Create(docxFilePath, WordprocessingDocumentType.Document))
            {
                MainDocumentPart mainDocumentPart = wordprocessingDocument.AddMainDocumentPart();
                mainDocumentPart.Document = new Document();
                mainDocumentPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.WordprocessingML, new MemoryStream(wordDocument));

                AltChunk altChunk = new AltChunk();
                altChunk.Id = "altChunkId1";
                mainDocumentPart.Document.Body.AppendChild(altChunk);

                mainDocumentPart.Document.Save();
            }
        }

        static byte[] ConvertRtfToWord(string rtfContent)
        {
            using (MemoryStream memoryStream = new MemoryStream())
            {
                // 将RTF文件转换为Word文档
                RichTextBox rtb = new RichTextBox();
                rtb.Rtf = rtfContent;
                rtb.SaveFile(memoryStream, RichTextBoxStreamType.RichText);

                // 将Word文档转换为字节数组
                byte[] wordDocument = new byte[memoryStream.Length];
                memoryStream.Position = 0;
                memoryStream.Read(wordDocument, 0, (int)memoryStream.Length);

                return wordDocument;
            }
        }
    }
}