xml文件操作

    public static XmlDocument getDoc(String path)//加载xml文档
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(path);
            return doc;
        } 
        /// <summary>
        /// 返回找到的节点下标
        /// </summary>
        /// <param name="path">xml文件路径</param>
        /// <param name="bname">书名</param>
        /// <returns></returns>
        public static int getPosition(String path,string node, String bname)
        {
            int i;
            XmlDocument doc = new XmlDocument();
            doc.Load(path);
            XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes;
            for (i = 0; i < nodeList.Count; i++)
            {
                if (nodeList[i].ChildNodes[0].InnerText == bname)
                {
                    return i;
                }
            }
            return -1;

        }

1.遍历

        /// <summary>
        /// 遍历数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnRead_Click(object sender, EventArgs e)
        {

            XmlDocument doc = getDoc("books.xml");//加载xml文档，books文件存放于
            foreach (XmlElement root in doc.DocumentElement.ChildNodes)//遍历根的子节点
            {
                Response.Write("<script>document.write('<br/>');</script>");
                Response.Write("<script>document.write('" + root.Name + "');</script>");//节点名root.Name  book
                foreach (XmlElement item in root.ChildNodes)
                {
                    Response.Write("<script>document.write('" + item.Name + "'+':'+'" + item.InnerText + "');</script>");//输出节点名和文本节点的值
                    Response.Write("<script>document.write('<br/>');</script>");
                }
            }
        }

 

2.查找

        /// <summary>
        /// 查找
        /// </summary>
        /// <param name="path">文件路径</param>
        /// <param name="node">节点</param>
        /// <param name="bname">查找关键字</param>
        /// <returns>XmlNode</returns>
        public static XmlNode Find(string path,string node,string bname)
        {
            XmlDocument doc =  new XmlDocument();
            doc.Load(path);//加载xml文档
            XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes;
            int i = getPosition(path, node, bname);//
            if (i >= 0)
                return nodeList[i];
            else
                return null;
        }

 3.删除节点

        /// <summary>
        /// 删除元素、属性
        /// </summary>
        /// <param name="path">文件</param>
        /// <param name="node">指定节点的父节点</param>
        /// <param name="attribute">为空时删除节点，否则删除属性</param>
        /// <param name="bname"></param>
        public static void Delete(string path,string node,string attribute,string bname)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(path);
            XmlNode root = doc.SelectSingleNode(node);
            XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes;
            int i = getPosition(path, node, bname);//返回指定的节点下标
            if (i >= 0)
            {
                if (attribute.Equals(""))
                {
                    root.RemoveChild(nodeList[i]);
                }
                else
                {
                    XmlElement xn = (XmlElement)nodeList[i];
                    xn.RemoveAttribute(attribute);
                }
            }

            doc.Save(path);

        }

4.添加

        /// <summary>
        /// 添加元素值
        /// </summary>
        /// <param name="path"></param>
        /// <param name="node"></param>
        /// <param name="element"></param>
        /// <param name="value"></param>
        /// <param name="i">插入的下标，如果为负，默认从最后一个节点插入</param>
        /// <returns></returns>
        public static bool Add(string path,string node,string element,string value,int i)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(path);
            XmlNodeList nodeList = doc.SelectNodes(node);
            XmlNode newNode = doc.SelectSingleNode(node).LastChild;
            if (i < 0 || i > nodeList.Count-1)//如果小于0或者大于节点长度，默认从最后一个节点添加
            {
                XmlElement newElement = doc.CreateElement(element);//创建元素
                newElement.InnerText = value;//赋值
                newNode.AppendChild(newElement);
            }

            else
            {
                XmlElement newElement = doc.CreateElement(element);
                newElement.InnerText = value;
                nodeList[i - 1].AppendChild(newElement);
            }
            doc.Save(path);
            return true;
        }

 

来源：https://www.cnblogs.com/Vennet/p/3910808.html