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xml文件操作

2024-07-17 14:58:54   232人阅读

    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;        }

 


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