xml基础练习

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1使用XlmReader读books.xml中有几本书。

--------Demo.aspx.cs---------

protected void Page_Load(object sender, EventArgs e)
        {
            XmlReaderSettings settings=new XmlReaderSettings();
            settings.IgnoreComments = true;
            settings.IgnoreWhitespace = true;
            int booknum = 0;
            using (XmlReader reader = XmlReader.Create(Server.MapPath("books.xml"), settings))//只要需要的路径不是url形式，就需要写实际的路径，不能写虚路径
            {
                while (reader.Read())
                {
                    if (reader.NodeType == XmlNodeType.Element)
                    {
                        if (reader.LocalName == "book")
                        {
                            booknum++;
                        }

}

                }
            }
            Response.Write("一共找到了"+booknum+"本书");
        }

2使用XlmWriter写NewBooks.xml文件。

----Demo1.aspx-----

----Demo1.aspx.cs-----

protected void Button1_Click(object sender, EventArgs e)
        {
            XmlWriterSettings settings=new XmlWriterSettings();

           settings.Encoding=System.Text.Encoding.UTF8;
            settings.Indent=true;
            using (XmlWriter write = XmlWriter.Create(Server.MapPath("newbook.xml"), settings))
            {
                write.WriteStartDocument();//开始写<?xml version="1.0" encoding="utf-8"?>
                write.WriteStartElement("books");//写根节点
                write.WriteStartElement("book");//book节点开始
                write.WriteStartAttribute("id");//给boook添加属性
                write.WriteValue("1");//设置属性id的值为1
                write.WriteEndAttribute();//结束属性id的设置
                write.WriteStartElement("author");//author节点开始
                write.WriteString("join");//author内容
                write.WriteEndElement();//author节点结束
                write.WriteEndElement();//book节点技术
                //第二本书开始
                write.WriteStartElement("book");//book节点开始
                write.WriteStartElement("publiser");//author节点开始
                write.WriteString("清华大学出版社");//author内容
                write.WriteEndElement();//author节点结束
                write.WriteEndElement();//book节点技术

            }
            Response.Write("ok");
        }

3使用XlmWrite把一个xml文件写入输出流中。在（demo2.aspx运行时显示xml文档）

-------Demo2.aspx---------

<%@ Page Xlanguage="C#" AutoEventWireup="true" CodeBehind="Demo2.aspx.cs" Inherits="XML.Demo2" %>

-------Demo2.aspx.cs---------

namespace XML
{
    public partial class Demo2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            XmlWriterSettings settings = new XmlWriterSettings();

            settings.Encoding = System.Text.Encoding.UTF8;
            settings.Indent = true;
            using (XmlWriter write = XmlWriter.Create(this.Response.Output, settings))
            {
                write.WriteStartDocument();//开始写<?xml version="1.0" encoding="utf-8"?>
                write.WriteStartElement("books");//写根节点
                write.WriteStartElement("book");//book节点开始
                write.WriteStartAttribute("id");//给boook添加属性
                write.WriteValue("1");//设置属性id的值为1
                write.WriteEndAttribute();//结束属性id的设置
                write.WriteStartElement("author");//author节点开始
                write.WriteString("join");//author内容
                write.WriteEndElement();//author节点结束
                write.WriteEndElement();//book节点技术
                //第二本书开始
                write.WriteStartElement("book");//book节点开始
                write.WriteStartElement("publiser");//author节点开始
                write.WriteString("清华大学出版社");//author内容
                write.WriteEndElement();//author节点结束
                write.WriteEndElement();//book节点技术

            }

        }
    }
}

4使用XmlDocument 读取books.xml中的书名到DropDownList中。（4-2选作使用XmlReader读取books.xml中的书名到DropDownList中）

-------Demo3.aspx----------

</div>

---------Demo3.aspx.cs------------

XmlDocument xdoc;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                xdoc = new XmlDocument();//声明一个xml文档实例,xdoc代表一个文档，但是代表谁现在没说
                xdoc.Load(Server.MapPath("books.xml"));//把book这个xml文档copy一份给xdoc
                XmlNodeList list = xdoc.GetElementsByTagName("name");
                foreach (XmlNode node in list)//把里面的内容都出来，用遍历取出来?
                {
                    this.DropDownList1.Items.Add(node.InnerText);
                }
                Session["doc"] = xdoc;
            }
            else
            {

                xdoc=Session["doc"] as XmlDocument;
            }

        }

5使用XmlDocument将dropdownlist中显示的书名的其它信息读入到相应的文本框中。

------------Demo4.aspx-----------

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .style1
        {
            width: 141px;
        }
        .style2
        {
            width: 200px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        书名：<asp:DropDownList ID="DropDownList1" runat="server" Height="25px"
            Width="184px">
        </asp:DropDownList>
        <asp:Button ID="Button1" runat="server" Xonclick="Button1_Click" Text="显示详情" />
        <br />
        <table style="width:100%;">
            <tr>
                <td class="style1">
                    作者：</td>
                <td class="style2">
                    <asp:TextBox ID="Txtauthor" runat="server" Width="199px"></asp:TextBox>
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style1">
                    出版社：</td>
                <td class="style2">
                    <asp:TextBox ID="Txtpublisher" runat="server" Width="198px"></asp:TextBox>
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style1">
                    出版年月：</td>
                <td class="style2">
                    <asp:TextBox ID="TxtYear" runat="server" Width="199px"></asp:TextBox>
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style1">
                    Isbn号：</td>
                <td class="style2">
                    <asp:TextBox ID="TxtISbn" runat="server" Width="199px"></asp:TextBox>
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style1">
                    价格：</td>
                <td class="style2">
                    <asp:TextBox ID="txtprice" runat="server" Width="199px"></asp:TextBox>
                </td>
                <td>
                     </td>
            </tr>
        </table>

    </div>
    </form>
</body>
</html>

------------Demo4.aspx.cs-----------

namespace XML
{
    public partial class Demo3 : System.Web.UI.Page
    {
        XmlDocument xdoc;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                xdoc = new XmlDocument();

xdoc.Load(Server.MapPath("books.xml"));

XmlNodeList list = xdoc.GetElementsByTagName("name");
foreach (XmlNode node in list)

                {
                    this.DropDownList1.Items.Add(node.InnerText);
                }
                Session["doc"] = xdoc;
            }
            else
            {

                xdoc=Session["doc"] as XmlDocument;
            }

        }

        protected void Button1_Click(object sender, EventArgs e)
        {

            XmlNode node = xdoc.DocumentElement.SelectSingleNode("book[name='" + this.DropDownList1.Text + "']");
            #region 方法1
            foreach (XmlNode item in node.ChildNodes)
            {

                if (item.LocalName == "author")
                {
                    this.Txtauthor.Text = item.InnerText;
                }
                if (item.LocalName == "publisher")
                {
                    this.Txtpublisher.Text = item.InnerText;
                }
                if (item.LocalName == "date")
                {
                    this.TxtYear.Text = item.InnerText;
                }
                if (item.LocalName == "isbn")
                {
                    this.TxtISbn.Text = item.InnerText;
                }
                if (item.LocalName == "price")
                {
                    this.txtprice.Text = item.InnerText;
                }
            }
            #endregion

            //#region 方法2
            //Txtauthor.Text = node.SelectSingleNode("author").InnerText;
            //Txtpublisher.Text = node.SelectSingleNode("publisher").InnerText;
            //TxtYear.Text = node.SelectSingleNode("date").InnerText;
            //TxtISbn.Text = node.SelectSingleNode("isbn").InnerText;
            //txtprice.Text = node.SelectSingleNode("price").InnerText;

            //#endregion
        }
    }
}