如何在C＃中使用OpenXmlPowertools获取docx的页眉和页脚

Question

我正在创建一个模块，该模块可以使用Nuget包中的OpenXmlPowerTools将docx转换为html。问题是当我要转换的docx文件具有页眉或页脚时，生成的html却也无法获得页眉部分或页脚。

代码如下：

byte[] byteArray = File.ReadAllBytes("test.docx");

            using (MemoryStream memoryStream = new MemoryStream())
            {
                memoryStream.Write(byteArray, 0, byteArray.Length);
                using (WordprocessingDocument doc = WordprocessingDocument.Open(memoryStream, true))
                {
                    int imageCounter = 0;
                    HtmlConverterSettings settings = new HtmlConverterSettings()
                    {
                        AdditionalCss = "body { margin: 1cm auto; max-width: 20cm; padding: 0; }",
                        PageTitle = "TEST",
                        FabricateCssClasses = true,
                        CssClassPrefix = "pt-",
                        RestrictToSupportedLanguages = false,
                        RestrictToSupportedNumberingFormats = false,
                        ImageHandler = imageInfo =>
                        {
                            DirectoryInfo localDirInfo = new DirectoryInfo("img");
                            if (!localDirInfo.Exists)
                                localDirInfo.Create();
                            ++imageCounter;
                            string extension = imageInfo.ContentType.Split('/')[1].ToLower();
                            ImageFormat imageFormat = null;
                            if (extension == "png")
                            {
                                extension = "gif";
                                imageFormat = ImageFormat.Gif;
                            }
                            else if (extension == "gif")
                                imageFormat = ImageFormat.Gif;
                            else if (extension == "bmp")
                                imageFormat = ImageFormat.Bmp;
                            else if (extension == "jpeg")
                                imageFormat = ImageFormat.Jpeg;
                            else if (extension == "tiff")
                            {
                                extension = "gif";
                                imageFormat = ImageFormat.Gif;
                            }
                            else if (extension == "x-wmf")
                            {
                                extension = "wmf";
                                imageFormat = ImageFormat.Wmf;
                            }
                            if (imageFormat == null)
                                return null;

                            string imageFileName = "img/image" +
                                imageCounter.ToString() + "." + extension;
                            try
                            {
                                imageInfo.Bitmap.Save(imageFileName, imageFormat);
                            }
                            catch (System.Runtime.InteropServices.ExternalException)
                            {
                                return null;
                            }
                            XElement img = new XElement(Xhtml.img,
                                new XAttribute(NoNamespace.src, imageFileName),
                                imageInfo.ImgStyleAttribute,
                                imageInfo.AltText != null ?
                                    new XAttribute(NoNamespace.alt, imageInfo.AltText) : null);
                            return img;
                        }
                    };
                    XElement html = HtmlConverter.ConvertToHtml(doc, settings);
                    File.WriteAllText("test.html", html.ToStringNewLineOnAttributes());
                };
            }

这是示例代码的链接，我从哪里获得的：https://github.com/OfficeDev/Open-Xml-PowerTools