net对XML增删改查

        public book getModel()
        {
            //封装获取数据
            book b = new book();            
            b.author = HttpContext.Current.Request["author"];
            b.category = HttpContext.Current.Request["category"];
            b.lang = HttpContext.Current.Request["lang"];
            b.price = Convert.ToDouble(HttpContext.Current.Request["price"]);
            b.title = HttpContext.Current.Request["title"];
            b.year = Convert.ToInt16(HttpContext.Current.Request["year"]);
            return b;
        }
        public List<book> readXMl()
        {
            List<book> ls = new List<book> { };
           
            //1.载入xml
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlPath);
      
            //2.获取文档下第一个子类的所以子类
            XmlNodeList listNode = doc.SelectSingleNode("bookstore").ChildNodes;

            //3.遍历子类
            foreach (XmlNode books in listNode)
            {
                book b = new book();                
                b.Id = Convert.ToInt16(books.Attributes["id"].InnerText);
                b.category = books.Attributes["category"].InnerText;
                b.title = books["title"].InnerText;
                b.lang = books["title"].Attributes["lang"].InnerText;
                b.author = books["author"].InnerText;
                b.year = Convert.ToInt16(books["year"].InnerText);
                b.price = Convert.ToDouble(books["price"].InnerText);

                ls.Add(b);
            }

            return ls;
        }
        public book readXMLById()
        {
            book b = getModel();

            //需要查询数据的Id
            b.Id = Convert.ToInt16(HttpContext.Current.Request["id"]);

            XmlDocument root = new XmlDocument();
            root.Load(xmlPath);

            XmlNode xml = root.SelectSingleNode("bookstore");
            XmlNodeList listnode = xml.ChildNodes;

            //遍历bookstore下的节点
            foreach (XmlNode i in listnode)
            {
                //获取每一个book的属性Id对比是否=需要查询的值
                if (i.Attributes["id"].InnerText == b.Id.ToString())
                {
                    b.category = i.Attributes[0].InnerText;
                    b.title = i["title"].InnerText;
                    b.lang = i["title"].Attributes["lang"].InnerText;
                    b.author = i["author"].InnerText;
                    b.year = Convert.ToInt16(i["year"].InnerText);
                    b.price = Convert.ToDouble(i["price"].InnerText);
                }
            }


            return b;

        }
        public bool WriteXml()
        {
            bool isValue = false;
            try
            {
                //设置模型类，只是为了更好的看到数据
                book b = getModel();

                //创建xml文件
                XmlDocument xml = new XmlDocument();
                xml.Load(xmlPath);

                //最高级树
                XmlNode root = xml.SelectSingleNode("bookstore");
                int id = Convert.ToInt16(root.LastChild.Attributes["id"].InnerText) + 1;

                //二级子节点
                XmlElement node = xml.CreateElement("book");
                node.SetAttribute("category", b.category);
                node.SetAttribute("id", id.ToString());

                //三级子节点
                XmlElement n1 = xml.CreateElement("title");
                n1.SetAttribute("lang", b.lang);
                n1.InnerText = b.title;

                XmlElement n2 = xml.CreateElement("author");
                n2.InnerText = b.author;

                XmlElement n3 = xml.CreateElement("year");
                n3.InnerText = b.year.ToString();

                XmlElement n4 = xml.CreateElement("price");
                n4.InnerText = b.price.ToString();

                //三级添加到二级
                node.AppendChild(n1);
                node.AppendChild(n2);
                node.AppendChild(n3);
                node.AppendChild(n4);

                //二级添加到一级
                root.AppendChild(node);

                //把文件保存到路径
                xml.Save(xmlPath);
                isValue = true;
            }
            catch (Exception e)
            {
                HttpContext.Current.Response.Write(e);
            }
            return isValue;


        }
        public bool delXMLById()
        {
            bool isValue = false;
            book b = getModel();
            b.Id = Convert.ToInt16(HttpContext.Current.Request["id"]);
            //以上为获取数据

            XmlDocument root = new XmlDocument();
            root.Load(xmlPath);

            XmlNode xml = root.SelectSingleNode("bookstore");
            XmlNodeList listnode = xml.ChildNodes;
            foreach (XmlNode i in listnode)
            {
                if (i.Attributes["id"].InnerText.ToString() == b.Id.ToString())
                {
                    xml.RemoveChild(i);
                    root.Save(xmlPath);
                    isValue = true;
                }
            }

            return isValue;
        }
        public bool upXMLByModel()
        {
            book b = getModel();
            bool isValue = false;
            b.Id = Convert.ToInt16(HttpContext.Current.Request["id"]);
            //以上为获取数据：request[""]

            XmlDocument root = new XmlDocument();
            root.Load(xmlPath);
            XmlNode xml = root.SelectSingleNode("bookstore");
            XmlNodeList xs = xml.ChildNodes;

            foreach (XmlNode x in xs)
            {
                if (x.Attributes["id"].InnerText.ToString() == b.Id.ToString())
                {
                    XmlElement node = x as XmlElement;
                    node.SetAttribute("category", b.category);

                    //三级树
                    XmlElement n1 = node.SelectSingleNode("title") as XmlElement;
                    n1.SetAttribute("lang", b.lang);
                    n1.InnerText = b.title;

                    XmlElement n2 = node.SelectSingleNode("author") as XmlElement;
                    n2.InnerText = b.author;

                    XmlElement n3 = node.SelectSingleNode("year") as XmlElement;
                    n3.InnerText = b.year.ToString();

                    XmlElement n4 = node.SelectSingleNode("price") as XmlElement;
                    n4.InnerText = b.price.ToString();

                    root.Save(xmlPath);
                    isValue = true;
                }
            }
            return isValue;
        }