OpenXML合并多个文件的Word文档格式

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

public void MergeWordDocuments(string[] fileNames, string outputFileName)
{
    using (WordprocessingDocument outputDocument = WordprocessingDocument.Create(outputFileName, WordprocessingDocumentType.Document))
    {
        MainDocumentPart mainPart = outputDocument.AddMainDocumentPart();
        mainPart.Document = new Document();
        Body body = mainPart.Document.AppendChild(new Body());

        foreach (string fileName in fileNames)
        {
            using (WordprocessingDocument inputDocument = WordprocessingDocument.Open(fileName, false))
            {
                var paragraphs = inputDocument.MainDocumentPart.Document.Body.Elements<Paragraph>();

                foreach (var paragraph in paragraphs)
                {
                    body.AppendChild(paragraph.CloneNode(true));
                }
            }
        }
    }
}