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;

        }