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  • 【XML】xml封装方法

    起兵有因：    

          最近，总是抱着专业书本或者电脑感觉好没意思，那就寻思着弄本书看看，消遣消遣，喝喝茶看看书，咱也文艺一下，可是关键没有合适的书！武侠吧没心看了，玄幻网游吧太扯淡，爱情吧，受不了搞程序的对着电脑不对美女久了就缺爱了。还是找本历史类的吧！对了，《明朝那些事》。看吧，一看不要紧，夜半三经还加倍呢，小伙够努力吧！（白天没时间，大家都理解）。刚看到朱棣“造反”，这事吧，也不懒人家，朱允文要干他，不反就坐牢。反也得有个理由吧，正苦恼，和尚道衍一剂“勤王清君侧”。其这招在汉武帝时就有了！虽然都知道这事怎么回事，但是咱们还是得有个理由，这样安慰安慰自己，也让兄弟们出去砍人时候有话说。扯远了，说说我这怎么回事吧！最近写一个基于xml的课程设计，连学带做终于搞定，但是事后觉得用着不爽，自己就封装一下，也算安慰一下这几天的辛苦！

    战前备事：

           公欲谋反，必先准备！故而咱也看看朱棣怎么做的。定下一个决心，老子反了（建立一个项目）。先去召集大家开开动员大会，找一片场地（建立一个web页面文件）。召集部分精英将领开会小会，透透气。 类的代码： 将领（xml预先准备的类）有姓名，年龄，性别（一般都是男的）等（类的属性）。每个将领有哪些特长如善骑射，弓箭，管理等（怎么封装的公共方法） 总结下：一个项目，一个页面（数据操作和显示），一个类（封装属性方法）

     public class Book
    {
        public string id { get; set; }//图书id
        public string bookcategory { get; set; }//图书类别
        public string image { get; set; }//图书图片
        public string title { get; set; }//图书名称
        public string author { get; set; }//图书作者
        public string publisher { get; set; }//出版社
        public string ISBN { get; set; }//图书编号
        public Double price { get; set; }//单价
        public int num { get; set; }//库存
    }

    一触即发：

         放一个gridview和表格。gridview进行数据显示，表格便于修改

     

    表格设置：

    前台完整代码如下：

    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="XML操作.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div style=" 1200px; height:500px; margin:20px auto">
    
        <asp:GridView ID="GridView1" runat="server" Height="300px" Width="1000px" 
            AllowPaging="True" AutoGenerateColumns="False" HorizontalAlign="Center" 
            onpageindexchanging="GridView1_PageIndexChanging" PageSize="6" 
            onrowdatabound="GridView1_RowDataBound" 
            onselectedindexchanging="GridView1_SelectedIndexChanging" 
            DataKeyNames="id" onrowdeleting="GridView1_RowDeleting">
          
            <Columns>
                <asp:BoundField DataField="id" HeaderText="图书编号" />
                <asp:BoundField DataField="bookcategory" HeaderText="类别" />
                <asp:TemplateField HeaderText="图片">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1"  runat="server" Text='<%# Eval("image") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Image ID="Image1"  runat="server" ImageUrl='<%# Eval("image") %>' Height="60" Width="80" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="title" HeaderText="书名" />
                <asp:BoundField DataField="author" HeaderText="作者" />
                <asp:BoundField DataField="publisher" HeaderText="出版社" />
                <asp:BoundField DataField="ISBN" HeaderText="图书编码" />
                <asp:BoundField DataField="price" HeaderText="价格" />
                <asp:BoundField DataField="num" HeaderText="库存" />
                <asp:CommandField HeaderText="选择" ShowSelectButton="True" />
                <asp:CommandField HeaderText="删除" ShowDeleteButton="True" />
            </Columns>
          
            <HeaderStyle BackColor="Black" Height="30px" BorderColor="Black" ForeColor="White" />
            <PagerSettings FirstPageText="首页" LastPageText="尾页" NextPageText="下一页" 
                PreviousPageText="上一页" Mode="NextPreviousFirstLast" />
            <PagerStyle BackColor="Black" ForeColor="White" />
        </asp:GridView>
    
    </div>
     <div style="  margin-top:20px; 1000px; height:500px; margin:20px auto; ">
         <table style=" 100%; height:300px; margin-top:10px;">
             <tr style="50% ;">
             <td rowspan="2" >
                 <asp:Image ID="Image1" Width="200px" Height="250px" runat="server" />
             </td>
             </tr>
             <tr>
               <td style="height: 270px">
               <table>
                 <tr><td>书名：</td><td>
                 <asp:TextBox ID="TextBox1" runat="server" MaxLength="15"></asp:TextBox>
                 </td></tr>
             <tr><td>作者：</td><td>
                 <asp:TextBox ID="TextBox2" runat="server" MaxLength="15"></asp:TextBox>
                 </td></tr>
             <tr><td>图书编号：</td><td>
                 <asp:TextBox ID="TextBox3" runat="server" MaxLength="15"></asp:TextBox>
                 </td></tr>
             <tr><td>图书类别：</td><td>
                 <asp:TextBox ID="TextBox4" runat="server" MaxLength="15"></asp:TextBox>
                 </td></tr>
             <tr><td>出版社：</td><td>
                 <asp:TextBox ID="TextBox5" runat="server" MaxLength="15"></asp:TextBox>
                 </td></tr>
             <tr><td>出版编号：</td><td>
                 <asp:TextBox ID="TextBox6" runat="server" MaxLength="15"></asp:TextBox>
                 </td></tr>
             <tr><td>价格：</td><td>
                 <asp:TextBox ID="TextBox7" runat="server" MaxLength="15" TextMode="Number"></asp:TextBox>
                </td></tr>
             <tr><td>库存：</td><td>
                 <asp:TextBox ID="TextBox8" runat="server" MaxLength="15" TextMode="Number"></asp:TextBox>
                </td></tr>
                 <tr><td>图片：</td><td>
                     <asp:FileUpload ID="FileUpload1"  runat="server" BackColor="White" 
                         Width="228px" />
                 </td></tr>
               </table>
               </td><td style="height: 270px"></td>
             </tr>
             <tr>
             <td colspan="2" style=" text-align:center;">
                 <span><asp:Button ID="Button1" runat="server" Text="修改" 
                     onclick="Button1_Click" /></span>
                 <span style=" margin-left:20px;">
                 <asp:Button ID="Button2" runat="server" 
                     Text="添加" onclick="Button2_Click" /></span> 
                 </td>
             </tr>
            </table>
    </div>
    </form>
</body>
</html>
    View Code


    关于类中方法的调用

    创建xml两种方法：

    方法一：

    //方法一：创建xml并保存
        public void Create(string xpath)
        {
            XDocument books = new XDocument(
             new XDeclaration("1.0", "utf-8", "yes"),
             new XComment("创建一个图书列表的xml"),
             new XElement("Booklist",
                 new XAttribute("ID", "000001"),
                 new XElement("Book",
                     new XElement("BookType", "计算机"),
                     new XElement("BookName", "算法与数据结构"),
                     new XElement("Auth", "严蔚敏 陈文博"),
                     new XElement("Publisher", "清华大学出版社"),
                     new XElement("Price", "24"),
                     new XElement("PubDate", "2002-1-1"),
                     new XElement("Quantity", "10")
                     )
                 )
             );
            books.Save(xpath);
            Console.Write(books);
        }
    View Code

    方法二：

    //方法二
        public void Create1(string xpath)
        {
            XmlDocument doc = new XmlDocument();
            //创建指令
            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
            doc.AppendChild(dec);
            //创建注释
            XmlComment xcm = doc.CreateComment("这是我建设的一个关于用户的xml文件");
            doc.AppendChild(xcm);
            //创建根元素（数据库）
            XmlElement root = doc.CreateElement("users");
            doc.AppendChild(root);
            //创建第一元素（表）
            XmlElement user = doc.CreateElement("user");
            //建立子元素
            XmlElement tom = doc.CreateElement("name");
            tom.SetAttribute("id", "001");
            tom.SetAttribute("sex", "男");
            tom.InnerText = "张三";
            user.AppendChild(tom);
            //建立子元素
            XmlElement jion = doc.CreateElement("name");
            jion.SetAttribute("id", "002");
            jion.SetAttribute("sex", "男");
            jion.InnerText = "司马迁";
            user.AppendChild(jion);
            //建立子元素
            XmlElement jon = doc.CreateElement("name");
            jon.SetAttribute("id", "003");
            jon.SetAttribute("sex", "女");
            jon.InnerText = "小丽";
            user.AppendChild(jon);
            //添加到根元素
            root.AppendChild(user);
            //保存
            doc.Save(xpath);
            //打印
           Console.Write(doc.OuterXml);
        }
    View Code

    查询：

    /// <summary>
        /// 查询信息
        /// </summary>
        /// <returns>dbs</returns>
        public List<Book> GetAll()
        {
            List<Book> dbs = (from db in doc.Element("books").Elements("book")
                              orderby db.Attribute("id").Value descending
                              select new Book
                                      {
                                          id = db.Attribute("id").Value.ToString(),
                                          bookcategory = db.Attribute("bookcategory").Value.ToString(),
                                          image = db.Element("image").Value.ToString(),
                                          title = db.Element("title").Value.ToString(),
                                          author = db.Element("author").Value.ToString(),
                                          publisher = db.Element("publisher").Value.ToString(),
                                          ISBN = db.Element("ISBN").Value.ToString(),
                                          price = Convert.ToDouble(db.Element("price").Value),
                                          num = Convert.ToInt32(db.Element("num").Value)
                                      }).ToList();
            return dbs;

        }
    View Code

    修改：

    /// <summary>
        /// 修改
        /// </summary>
        /// <returns></returns>
        public bool Modify(string id)
        {
            //XElement ex = XElement.Load(@"C:\Users\aa\Desktop\BookShop\BookShop\xml\Books.xml");
            //var b = (from f in ex.Descendants("book") where (string)f.Attribute("id").Value.ToString()== id select f).Single();
            XElement xe = (from db in doc.Element("books").Elements("book") where db.Attribute("id").Value.ToString() == id select db).Single();
            try
            {
                xe.Attribute("id").SetValue(id);
                xe.Element("title").SetValue(title);
                xe.Element("author").SetValue(author);
                xe.Attribute("bookcategory").SetValue(bookcategory);
                xe.Element("publisher").SetValue(publisher);
                xe.Element("ISBN").SetValue(ISBN);
                xe.Element("price").SetValue(price);
                xe.Element("num").SetValue(num);
                xe.Element("image").SetValue(image);
                return true;
            }
            catch
            {
                return false;
            }
        }
    View Code

    添加：

    /// <summary>
        /// 添加信息
        /// </summary>
        /// <returns></returns>
        public bool Add()
        {
            try
            {
                XElement root = XElement.Load(filePath);
                XElement xe = new XElement("book",
                    new XAttribute("id", id),
                    new XAttribute("bookcategory", bookcategory),
                    new XElement("image", image),
                    new XElement("title", title),
                    new XElement("author", author),
                    new XElement("publisher", publisher),
                    new XElement("ISBN", ISBN),
                    new XElement("price", price),
                    new XElement("num", num)
                    );
                root.Add(xe);
                root.Save(filePath);
                return true;
            }
            catch
            {
                return false;
            }
        }
    View Code

    删除：

    /// <summary>
        /// 删
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public bool Remove(string id)
        {
            XElement xe = (from db in doc.Element("books").Elements("book") where db.Attribute("id").Value == id select db).Single() as XElement;
            try
            {
                xe.Remove();
                doc.Save(filePath);
                return true;
            }
            catch
            {
                return false;
            }
        }
    View Code

    完整的cs代码：

    using System.Xml.Linq;
namespace XML操作
{
    public class Book
    {
        public string id { get; set; }//图书id
        public string bookcategory { get; set; }//图书类别
        public string image { get; set; }//图书图片
        public string title { get; set; }//图书名称
        public string author { get; set; }//图书作者
        public string publisher { get; set; }//出版社
        public string ISBN { get; set; }//图书编号
        public Double price { get; set; }//单价
        public int num { get; set; }//库存
    
    

        private static XDocument doc = new XDocument();
        public static string filePath = @"C:\Users\宁超\Desktop\XML操作\XML操作\xml\Books.xml";
        public Book()
        {
            doc = XDocument.Load(filePath);
        }
        public Book(string xpath)
            : this()
        {
            filePath = xpath;
        }

        //方法一：创建xml并保存
        public void Create(string xpath)
        {
            XDocument books = new XDocument(
             new XDeclaration("1.0", "utf-8", "yes"),
             new XComment("创建一个图书列表的xml"),
             new XElement("Booklist",
                 new XAttribute("ID", "000001"),
                 new XElement("Book",
                     new XElement("BookType", "计算机"),
                     new XElement("BookName", "算法与数据结构"),
                     new XElement("Auth", "严蔚敏 陈文博"),
                     new XElement("Publisher", "清华大学出版社"),
                     new XElement("Price", "24"),
                     new XElement("PubDate", "2002-1-1"),
                     new XElement("Quantity", "10")
                     )
                 )
             );
            books.Save(xpath);
            Console.Write(books);
        }
        //方法二
        public void Create1(string xpath)
        {
            XmlDocument doc = new XmlDocument();
            //创建指令
            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
            doc.AppendChild(dec);
            //创建注释
            XmlComment xcm = doc.CreateComment("这是我建设的一个关于用户的xml文件");
            doc.AppendChild(xcm);
            //创建根元素（数据库）
            XmlElement root = doc.CreateElement("users");
            doc.AppendChild(root);
            //创建第一元素（表）
            XmlElement user = doc.CreateElement("user");
            //建立子元素
            XmlElement tom = doc.CreateElement("name");
            tom.SetAttribute("id", "001");
            tom.SetAttribute("sex", "男");
            tom.InnerText = "张三";
            user.AppendChild(tom);
            //建立子元素
            XmlElement jion = doc.CreateElement("name");
            jion.SetAttribute("id", "002");
            jion.SetAttribute("sex", "男");
            jion.InnerText = "司马迁";
            user.AppendChild(jion);
            //建立子元素
            XmlElement jon = doc.CreateElement("name");
            jon.SetAttribute("id", "003");
            jon.SetAttribute("sex", "女");
            jon.InnerText = "小丽";
            user.AppendChild(jon);
            //添加到根元素
            root.AppendChild(user);
            //保存
            doc.Save(xpath);
            //打印
           Console.Write(doc.OuterXml);
        }



        /// <summary>
        /// 查询信息
        /// </summary>
        /// <returns>dbs</returns>
        public List<Book> GetAll()
        {
            List<Book> dbs = (from db in doc.Element("books").Elements("book")
                              orderby db.Attribute("id").Value descending
                              select new Book
                                      {
                                          id = db.Attribute("id").Value.ToString(),
                                          bookcategory = db.Attribute("bookcategory").Value.ToString(),
                                          image = db.Element("image").Value.ToString(),
                                          title = db.Element("title").Value.ToString(),
                                          author = db.Element("author").Value.ToString(),
                                          publisher = db.Element("publisher").Value.ToString(),
                                          ISBN = db.Element("ISBN").Value.ToString(),
                                          price = Convert.ToDouble(db.Element("price").Value),
                                          num = Convert.ToInt32(db.Element("num").Value)
                                      }).ToList();
            return dbs;

        }

        /// <summary>
        /// 根据主键查询详细分条信息
        /// </summary>
        /// <returns></returns>
        public List<Book> SelBook(string id)
        {
            var query =( from mytable in doc.Descendants("book")
                        where mytable.Attribute("id").Value.ToString() == id
                        select new Book()
                        {
                            id = mytable.Attribute("id").Value,
                            bookcategory = mytable.Attribute("bookcategory").Value,
                            image = mytable.Element("image").Value,
                            title = mytable.Element("title").Value,
                            author = mytable.Element("author").Value,
                            publisher = mytable.Element("publisher").Value,
                            ISBN = mytable.Element("ISBN").Value,
                            price =Convert.ToDouble(mytable.Element("price").Value),
                            num = Convert.ToInt32(mytable.Element("num").Value)
                        }).ToList();
            return query;
        }

        /// <summary>
        /// 添加信息
        /// </summary>
        /// <returns></returns>
        public bool Add()
        {
            try
            {
                XElement root = XElement.Load(filePath);
                XElement xe = new XElement("book",
                    new XAttribute("id", id),
                    new XAttribute("bookcategory", bookcategory),
                    new XElement("image", image),
                    new XElement("title", title),
                    new XElement("author", author),
                    new XElement("publisher", publisher),
                    new XElement("ISBN", ISBN),
                    new XElement("price", price),
                    new XElement("num", num)
                    );
                root.Add(xe);
                root.Save(filePath);
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 删
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public bool Remove(string id)
        {
            XElement xe = (from db in doc.Element("books").Elements("book") where db.Attribute("id").Value == id select db).Single() as XElement;
            try
            {
                xe.Remove();
                doc.Save(filePath);
                return true;
            }
            catch
            {
                return false;
            }
        }


        /// <summary>
        /// 修改
        /// </summary>
        /// <returns></returns>
        public bool Modify(string id)
        {
            //XElement ex = XElement.Load(@"C:\Users\aa\Desktop\BookShop\BookShop\xml\Books.xml");
            //var b = (from f in ex.Descendants("book") where (string)f.Attribute("id").Value.ToString()== id select f).Single();
            XElement xe = (from db in doc.Element("books").Elements("book") where db.Attribute("id").Value.ToString() == id select db).Single();
            try
            {
                xe.Attribute("id").SetValue(id);
                xe.Element("title").SetValue(title);
                xe.Element("author").SetValue(author);
                xe.Attribute("bookcategory").SetValue(bookcategory);
                xe.Element("publisher").SetValue(publisher);
                xe.Element("ISBN").SetValue(ISBN);
                xe.Element("price").SetValue(price);
                xe.Element("num").SetValue(num);
                xe.Element("image").SetValue(image);
                return true;
            }
            catch
            {
                return false;
            }
        }

    }
}
    View Code

    前台调用
    完整的web页面代码：

     public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                this.Bind();
            }
        }
        Book b = new Book();

        //查询
        public void Bind()
        { 
            var ds = b.GetAll();
            GridView1.DataSource = ds;
            GridView1.DataBind();
        }

        //方法一：创建xml并保存
        public void Create()
        {
            string xpath = Server.MapPath("~/xml/peoples.xml");
            b.Create(xpath);
        }
        //方法二
        public void Create1()
        {
            string xpath = Server.MapPath("~/xml/User.xml");
            b.Create1(xpath);
        }
        //分页
        protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            GridView1.PageIndex = e.NewPageIndex;
            this.Bind();
        }
        //行颜色变化
        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            for (int i = 0; i < GridView1.Rows.Count + 1; i++) //执行循环，保证每条数据都可以更新
            {
                if (e.Row.RowType == DataControlRowType.DataRow)  //首先判断是否是数据行
                {
                    //当鼠标停留时更改背景色
                    e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#999'");
                    //当鼠标移开时还原背景色
                    e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
                }
            }
        }
        //选择
        protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
        {
            try
            {
                TextBox3.Text = GridView1.DataKeys[e.NewSelectedIndex].Value.ToString();//编号
                string id=TextBox3.Text;
                List<Book> query= b.SelBook(id);
                foreach (var item in query)
                {
                    TextBox1.Text = item.title;//书名
                    TextBox2.Text = item.author;//作者
                    TextBox3.Text = item.id;
                    TextBox4.Text = item.bookcategory;//类别
                    TextBox5.Text = item.publisher;//出版社
                    TextBox6.Text = item.ISBN;//出版编号
                    TextBox7.Text = item.price.ToString();//价格
                    TextBox8.Text = item.num.ToString();//库存
                    Image1.ImageUrl = item.image;//图片
                }
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message + ex.StackTrace);
            }
        }
        //删除
        protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string id = GridView1.DataKeys[e.RowIndex].Value.ToString();
            bool falg = b.Remove(id);
            if (falg == true)
            {
                string s = "<script>alert('删除成功！')</script>";
                Response.Write(s);
                this.Bind();
            }
            else
            {
                string s = "<script>alert('删除失败！')</script>";
                Response.Write(s);
            }
        }
        //添加
        protected void Button2_Click(object sender, EventArgs e)
        {
            b.title = this.TextBox1.Text;
            b.author = this.TextBox2.Text;
            b.id= this.TextBox3.Text;
            b.bookcategory = this.TextBox4.Text;
            b.publisher= this.TextBox5.Text;
            b.ISBN= this.TextBox6.Text;
            b.price=Convert.ToDouble(this.TextBox7.Text);
            b.num=Convert.ToInt32(this.TextBox8.Text);

            string file = FileUpload1.FileName;
            FileUpload1.SaveAs(Server.MapPath("~/imgbook/" + file));
            Image1.ImageUrl = "~/imgbook/" + file;
            b.image = Image1.ImageUrl;

            bool falg = b.Add();
            if (falg == true)
            {
                string s = "<script>alert('添加成功！')</script>";
                Response.Write(s);
                this.Bind();
            }
            else
            {
                string s = "<script>alert('添加失败！')</script>";
                Response.Write(s);
            }
        }
        //修改
        protected void Button1_Click(object sender, EventArgs e)
        {
            b.title = this.TextBox1.Text;
            b.author = this.TextBox2.Text;
            b.id = this.TextBox3.Text;
            string id = b.id;
            b.bookcategory = this.TextBox4.Text;
            b.publisher = this.TextBox5.Text;
            b.ISBN = this.TextBox6.Text;
            b.price = Convert.ToDouble(this.TextBox7.Text);
            b.num = Convert.ToInt32(this.TextBox8.Text);
            b.image = Image1.ImageUrl;

            bool falg = b.Modify(id);
            if (falg == true)
            {
                string s = "<script>alert('修改成功！')</script>";
                Response.Write(s);
                this.Bind();
            }
            else
            {
                string s = "<script>alert('修改失败！')</script>";
                Response.Write(s);
            }
        }
    
    
    }
    View Code

    将在外君命有所不受

    大将在外可以不受君王节制，那么程序的操作也不算一种方法写死的，下面介绍下节点的使用：

    查询：

     /// <summary>
            /// 查询信息
            /// </summary>
            /// <returns>dbs</returns>
            public DataSet Select()
            {
                DataSet ds = new DataSet();
                StringReader sreader = null;
                XmlTextReader xtreader = null;
                try
                {
                    XmlDocument doc = new XmlDocument();
                    doc.Load(filePath);
                    sreader = new StringReader(doc.InnerXml);
                    xtreader = new XmlTextReader(sreader);
                    ds.ReadXml(xtreader);
                    return ds;
                }
                catch (Exception) { throw; return null; }
                finally
                {
                    xtreader.Close();
                    sreader.Close();
                }
            }
    View Code

    添加：

     /// <summary>
            /// 添加信息
            /// </summary>
            /// <returns></returns>
            public bool Add()
            {
                try
                {
                    //在第一个前面插入一条信息
                    XmlDocument doc = new XmlDocument();
                    doc.Load(filePath);
                    XmlNode books = doc.SelectSingleNode("books");

                    XmlElement book = doc.CreateElement("book");
                    book.SetAttribute("id", id);
                    book.SetAttribute("bookcategory", bookcategory);

                    XmlElement image = doc.CreateElement("image");
                    image.InnerText = this.image;
                    book.AppendChild(image);

                    XmlElement title = doc.CreateElement("title");
                    title.InnerText = this.title;
                    book.AppendChild(title);

                    XmlElement author = doc.CreateElement("author");
                    author.InnerText = this.author;
                    book.AppendChild(author);

                    XmlElement publisher = doc.CreateElement("publisher");
                    publisher.InnerText = this.publisher;
                    book.AppendChild(publisher);

                    XmlElement ISBN = doc.CreateElement("ISBN");
                    ISBN.InnerText = this.ISBN;
                    book.AppendChild(ISBN);

                    XmlElement price = doc.CreateElement("price");
                    price.InnerText = this.price.ToString();
                    book.AppendChild(price);

                    XmlElement num = doc.CreateElement("num");
                    num.InnerText = this.num.ToString();
                    book.AppendChild(num);
                    books.InsertBefore(book, books.FirstChild);
                    doc.Save(filePath);
                    return true;
                }
                catch { return false; }

            }
    View Code

    删除：

    /// <summary>
            /// 删
            /// </summary>
            /// <param name="id"></param>
            /// <returns></returns>
            public bool Remove(string id)
            {
                XElement xe = (from db in doc.Element("books").Elements("book") where db.Attribute("id").Value == id select db).Single() as XElement;
                try
                {
                    xe.Remove();
                    doc.Save(filePath);
                    return true;
                }
                catch
                {
                    return false;
                }
            }
    View Code

    修改：

    /// <summary>
            /// 修改
            /// </summary>
            /// <returns></returns>
            public bool Modify(string id)
            {
                //XElement ex = XElement.Load(@"C:\Users\aa\Desktop\BookShop\BookShop\xml\Books.xml");
                //var b = (from f in ex.Descendants("book") where (string)f.Attribute("id").Value.ToString()== id select f).Single();
                XElement xe = (from db in doc.Element("books").Elements("book") where db.Attribute("id").Value.ToString() == id select db).Single();
                try
                {
                    xe.Attribute("id").SetValue(id);
                    xe.Element("title").SetValue(title);
                    xe.Element("author").SetValue(author);
                    xe.Attribute("bookcategory").SetValue(bookcategory);
                    xe.Element("publisher").SetValue(publisher);
                    xe.Element("ISBN").SetValue(ISBN);
                    xe.Element("price").SetValue(price);
                    xe.Element("num").SetValue(num);
                    xe.Element("image").SetValue(image);
                    return true;
                }
                catch
                {
                    return false;
                }
            }
    View Code

    凯歌而归

    最后说明一下，本程序对xml操作，采用两种方法，经过测试都没问题。详细完整的代码在讲解过程中已经附录！
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  • 原文地址：https://www.cnblogs.com/baiboy/p/3089132.html
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