<?xml version="1.0" encoding="utf-8"?>
<books>
    <book>
        <author>追逐時光者</author>
        <title>XML學習教程</title>
        <publisher>時光出版社</publisher>
    </book>
</books>

/// <summary>
        /// 特殊符號轉換為轉義字符
        /// </summary>
        /// <param name="xmlStr"></param>
        /// <returns></returns>
        public string XmlSpecialSymbolConvert(string xmlStr)
        {
            return xmlStr.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;").Replace("\'", "&apos;").Replace("\"", "&quot;");
        }

/// <summary>
        /// 創(chuàng)建Xml文件
        /// </summary>
        public void CreateXmlFile()
        {
            XmlDocument xmlDoc = new XmlDocument();
            //創(chuàng)建類型聲明節(jié)點  
            XmlNode node = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", "");
            xmlDoc.AppendChild(node);
            //創(chuàng)建Xml根節(jié)點  
            XmlNode root = xmlDoc.CreateElement("books");
            xmlDoc.AppendChild(root);

            XmlNode root1 = xmlDoc.CreateElement("book");
            root.AppendChild(root1);

            //創(chuàng)建子節(jié)點
            CreateNode(xmlDoc, root1, "author", "追逐時光者");
            CreateNode(xmlDoc, root1, "title", "XML學習教程");
            CreateNode(xmlDoc, root1, "publisher", "時光出版社");
            //將文件保存到指定位置
            xmlDoc.Save("D://xmlSampleCreateFile.xml");
        }

        /// <summary>    
        /// 創(chuàng)建節(jié)點    
        /// </summary>    
        /// <param name="xmlDoc">xml文檔</param>    
        /// <param name="parentNode">Xml父節(jié)點</param>    
        /// <param name="name">節(jié)點名</param>    
        /// <param name="value">節(jié)點值</param>    
        ///   
        public void CreateNode(XmlDocument xmlDoc, XmlNode parentNode, string name, string value)
        {
            //創(chuàng)建對應Xml節(jié)點元素
            XmlNode node = xmlDoc.CreateNode(XmlNodeType.Element, name, null);
            node.InnerText = value;
            parentNode.AppendChild(node);
        }

<?xml version="1.0" encoding="utf-8"?>
<books>
  <book>
    <author>追逐時光者</author>
    <title>XML學習教程</title>
    <publisher>時光出版社</publisher>
  </book>
</books>

private static void AppendNode()
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("D://xmlSampleCreateFile.xml");//加載Xml文件
            XmlNode root = xmlDoc.SelectSingleNode("books/book");//選擇要添加子節(jié)點的book節(jié)點
            //創(chuàng)建一個新的Xml節(jié)點元素
            XmlNode node = xmlDoc.CreateNode(XmlNodeType.Element, "publishdate", null);
            node.InnerText = "2022-03-26";
            root.AppendChild(node);//將創(chuàng)建的item子節(jié)點添加到items節(jié)點的尾部
            xmlDoc.Save("D://AppendNodeFile.xml");//保存修改的Xml文件內容
        }

<?xml version="1.0" encoding="utf-8"?>
<books>
  <book>
    <author>追逐時光者</author>
    <title>XML學習教程</title>
    <publisher>時光出版社</publisher>
    <publishdate>2022-03-26</publishdate>
  </book>
</books>

private static void UpdateXml()
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("D://xmlSampleCreateFile.xml");//加載Xml文件
            XmlNode xns = xmlDoc.SelectSingleNode("books/book");//查找要修改的節(jié)點
            XmlNodeList xmlNodeList = xns.ChildNodes;//取出book節(jié)點下所有的子節(jié)點

            foreach (XmlNode xmlNode in xmlNodeList)
            {
                XmlElement xmlElement = (XmlElement)xmlNode;//將節(jié)點轉換一下類型
                if (xmlElement.Name=="author")//判斷該子節(jié)點是否是要查找的節(jié)點
                {
                    xmlElement.InnerText = "大姚同學";//設置新值
                    break;
                }
            }
            xmlDoc.Save("D://UpdateXml.xml");//保存修改的Xml文件內容
        }

<?xml version="1.0" encoding="utf-8"?>
<books>
  <book>
    <author>大姚同學</author>
    <title>XML學習教程</title>
    <publisher>時光出版社</publisher>
  </book>
</books>

private static void DeleteXmlNode()
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("D://xmlSampleCreateFile.xml");//加載Xml文件
            XmlNode xns = xmlDoc.SelectSingleNode("books/book");//查找要刪除的根節(jié)點

            #region 刪除author節(jié)點

            var delNode = xmlDoc.SelectSingleNode("books/book/" + "author");
            xns.RemoveChild(delNode);

            #endregion

            xmlDoc.Save("D://DeleteXmlNode.xml");//保存操作后的Xml文件內容
        }

private static void ClearDataXmlNode()
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("D://xmlSampleCreateFile.xml");//加載Xml文件
            XmlNode xns = xmlDoc.SelectSingleNode("books/book");//查找要刪除的根節(jié)點

            #region 清空author節(jié)點下的數(shù)據(jù)
            XmlNodeList xmlNodeList = xns.ChildNodes;//取出book節(jié)點下所有的子節(jié)點
            foreach (XmlNode xmlNode in xmlNodeList)
            {
                XmlElement xmlElement = (XmlElement)xmlNode;//將節(jié)點轉換一下類型
                if (xmlElement.Name == "author")//判斷該子節(jié)點是否是要查找的節(jié)點
                {
                    //清空author節(jié)點下的數(shù)據(jù)
                    xmlElement.RemoveAll();//刪除該節(jié)點的全部內容
                }
            }
            #endregion

            xmlDoc.Save("D://ClearDataXmlNode.xml");//保存操作后的Xml文件內容
        }