c# - 无法插入 OpenXmlElement“newChild”，因为它是树的一部分

Question

标题说明了我遇到的错误。我正在尝试使用 OpenXml隐藏word doc 中的所有文本。目前，当我尝试附加段落属性时，我收到上述错误。我在网上找不到太多关于这个错误的信息。

返回错误的代码

        using (WordprocessingDocument wdDoc = WordprocessingDocument.Open(mDoc_copy, true))
        {
            // Manage namespaces to perform XPath queries.
            NameTable nt = new NameTable();
            XmlNamespaceManager nsManager = new XmlNamespaceManager(nt);
            nsManager.AddNamespace("w", wordmlNamespace);

            // Get the document part from the package.
            // Load the XML in the document part into an XmlDocument instance.
            XmlDocument xdoc = new XmlDocument(nt);
            xdoc.Load(wdDoc.MainDocumentPart.GetStream());

            MainDocumentPart main = wdDoc.MainDocumentPart;

            IEnumerable<OpenXmlElement> elem = main.Document.Body.Descendants().ToList();
            Paragraph p;
            ParagraphProperties pp = new ParagraphProperties();
            ParagraphMarkRunProperties prmp = new ParagraphMarkRunProperties();
            Vanish v = new Vanish();
            apprmp.AppendChild<Vanish>(v);
            pp.AppendChild<ParagraphMarkRunProperties>(apprmp);


            foreach (Paragraph para in main.Document.Body.Descendants<Paragraph>().ToList())
            {


                    para.ParagraphProperties = pp;

            }
       }

Answer 1

通常，可以通过克隆导致异常的任何节点然后插入该克隆值来修复此错误。像这样的东西：

LeftBorder leftBorder = new LeftBorder() { Style = BorderStyleValues.Thin };
TopBorder topBorder = new TopBorder() { Style = BorderStyleValues.Thin };
RightBorder rightBorder = new RightBorder() { Style = BorderStyleValues.Thin };
BottomBorder bottomBorder = new BottomBorder() { Style = BorderStyleValues.Thin };

Color color = new Color() { Auto = true, Rgb = rgbHexValue == string.Empty ? new HexBinaryValue("00000000") : new HexBinaryValue(rgbHexValue) };

leftBorder.Color = color;
topBorder.Color = (Color)color.CloneNode(true);
rightBorder.Color = (Color)color.CloneNode(true);
bottomBorder.Color = (Color)color.CloneNode(true);

这将创建一个Color实例，然后通过克隆原始实例然后插入它来对所有边框使用相同的实例。