C#：附加多个docx文件后，接收损坏的输出docx文件

using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;

class Program
{
    static void Main(string[] args)
    {
        string[] inputFiles = { "file1.docx", "file2.docx", "file3.docx" };
        string outputFile = "output.docx";

        using (WordprocessingDocument outputDoc = WordprocessingDocument.Create(outputFile, WordprocessingDocumentType.Document))
        {
            MainDocumentPart mainPart = outputDoc.AddMainDocumentPart();
            mainPart.Document = new Document();

            foreach (string inputFile in inputFiles)
            {
                using (WordprocessingDocument inputDoc = WordprocessingDocument.Open(inputFile, false))
                {
                    var altChunkId = "AltChunkId" + Guid.NewGuid().ToString().Replace("-", "");

                    AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.WordprocessingML, altChunkId);
                    chunk.FeedData(inputDoc.MainDocumentPart.GetStream());

                    AltChunk altChunk = new AltChunk();
                    altChunk.Id = altChunkId;

                    mainPart.Document.Body.AppendChild(altChunk);
                }
            }

            mainPart.Document.Save();
        }
    }
}