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csdn_xml

By Tracy Martinez,2014-09-05 12:49
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csdn_xml

     .NET里面利用XML 作者?动网先锋

     呵呵;有意思;听过一个笑话;说德国一个老头;是个聋子;在如厕时;突然苏联战机空袭;虽然房屋倒塌;可是全家人都没有事情;家里人扒开卫生间的墙壁;发现老头在那儿乐;说?我一拉抽水马桶的绳;屋就倒了。 哈哈哈;我也是这样;刚才我一发这贴子;chinaasp就完了;还以为是我的事情呢;原来是苏联飞机来炸了;呵呵。

    如果你喜欢玩xml;那么请跟我来;但在此之前;请深呼一口气;因为我给大家介绍一个长代码;在这个代码中揭示了微软在ASP.NET架构中隐藏的一个!,?表单控件;即<asp:xml runat=server/>;我只给代码;不给解释;大家自己下课后去研究吧。

    另外;由于是beta1;在这个控件中你使用的xslt里面不能使用<xsl:sort>;当然;亦不能使用那个order-by了;因为它支持的xsl空间是"1999"的那个;而不是原来的那个。

    另外;我从微软得到的回答就是在beta2里面;它将支持<xsl:sort>;到那时;哥哥我将全部转向xml+xsl了;现在为源代码保密问题给弄的非常头疼。

    请看下例?

    webform2.cs

    ---------------------------------

    using System;

    using System.Collections;

    using System.ComponentModel;

    using System.Data;

    using System.Drawing;

    using System.Web;

    using System.Web.SessionState;

    using System.Web.UI;

    using System.Web.UI.WebControls;

    using System.Web.UI.HtmlControls;

    using System.Text;

    using System.IO;

    using System.Xml;

public class WebForm2 : Page

    {

    public StringBuilder outputQ;

    public StringBuilder outputXml;

    public DocumentNavigator nav = null;

    public HtmlInputFile XmlFile;

public System.Web.UI.WebControls.Xml MyXml;

    public System.Web.UI.WebControls.TextBox TextBox1;

    public System.Web.UI.WebControls.TextBox TextBox2; public System.Web.UI.WebControls.TextBox TextBox3; public System.Web.UI.WebControls.Button Query; public System.Web.UI.WebControls.Label FileLabel;

    public void On_KeyUp(object sender, System.EventArgs e) {

    Response.Write("Works");

    }

    protected void Page_Load(object sender, EventArgs e) {

    if (!IsPostBack)

    {

    //

    // Evals true first time browser hits the page //

    }

    }

    public void Query_Click(object sender, System.EventArgs e) {

    HttpPostedFile xmlfile = XmlFile.PostedFile; XmlDocument doc = new XmlDocument();

    MyXml.Document = new XmlDocument();

    // TextBox2.Text="";

    // TextBox3.Text="";

if (xmlfile.FileName != String.Empty)

    {

    try

    {

    FileLabel.Text= xmlfile.FileName;

MyXml.Document.Load(xmlfile.FileName);

    outputXml = new StringBuilder();

    XmlTextReader reader = new XmlTextReader (xmlfile.FileName); ShowDocument();

    TextBox3.Text = outputXml.ToString();

outputQ = new StringBuilder();

    doc.Load(xmlfile.FileName);

    DocumentNavigator nav = new DocumentNavigator(doc); // Perform the query e.g. "descendant::book/price"

XPathQuery(nav, TextBox1.Text);

    TextBox2.Text = outputQ.ToString();

}

    catch (Exception exp) {

    //outputQ.Append("</xmp><font color=\"#FF6600\">"+

    exp.Message+"</font><xmp>");

    }

    finally {}

    }

    else if (FileLabel.Text != String.Empty) {

    try

    {

    MyXml.Document.Load(FileLabel.Text); outputXml = new StringBuilder(); XmlTextReader reader = new XmlTextReader (FileLabel.Text);

    ShowDocument();

    TextBox3.Text = outputXml.ToString();

ShowDocument();

outputQ = new StringBuilder();

    doc.Load(FileLabel.Text);

    DocumentNavigator nav = new DocumentNavigator(doc);

    // Perform the query e.g. "descendant::book/price"

    XPathQuery(nav, TextBox1.Text);

    TextBox2.Text = outputQ.ToString();

}

    catch (Exception exp) {

    outputQ.Append("</xmp><font color=\"#FF6600\">"+

    exp.Message+"</font><xmp>");

    }

    finally {}

    }

    }

private void XPathQuery(XmlNavigator navigator, String xpathexpr )

    {

    try

    {

    // Save context node position

    navigator.PushPosition();

    navigator.Select (xpathexpr); FormatXml(navigator);

    // Restore context node position navigator.PopPosition();

    }

    catch (Exception e)

    {

    }

    }

//***************************** Navigator

    ************************************ private void FormatXml (XmlNavigator navigator)

    {

    while (navigator.MoveToNextSelected()) {

    switch (navigator.NodeType) {

    case XmlNodeType.ProcessingInstruction: Format (navigator, "ProcessingInstruction");

    break;

    case XmlNodeType.DocumentType: Format (navigator, "DocumentType"); break;

    case XmlNodeType.Document:

    Format (navigator, "Document"); break;

    case XmlNodeType.Comment:

    Format (navigator, "Comment"); break;

    case XmlNodeType.Element:

    Format (navigator, "Element"); break;

    case XmlNodeType.Text:

    Format (navigator, "Text"); break;

    case XmlNodeType.Whitespace: Format (navigator, "Whitespace"); break;

    }

    }

    outputQ.Append("\r\n");

    }

// Format the output

    private void Format (XmlNavigator navigator, String NodeType)

    {

    String value = String.Empty; String name = String.Empty;

    if (navigator.HasChildren) {

    name = navigator.Name;

    navigator.MoveToFirstChild(); if (navigator.HasValue)

    {

    value = navigator.Value;

    }

    }

    else

    {

    if (navigator.HasValue)

    {

    value = navigator.Value;

    name = navigator.Name;

    }

    }

    outputQ.Append(NodeType + "<" + name + ">" + value);

    outputQ.Append("\r\n");

    }

// ********************************** XmlReader

    ***************************** public void ShowDocument () {

    outputXml = new StringBuilder(); XmlTextReader reader = new XmlTextReader (FileLabel.Text);

while (reader.Read())

    {

    switch (reader.NodeType)

    {

    case XmlNodeType.ProcessingInstruction:

    Format (reader, "ProcessingInstruction");

    break;

    case XmlNodeType.DocumentType: Format (reader, "DocumentType");

break;

    case XmlNodeType.Comment:

    Format (reader, "Comment");

    break;

    case XmlNodeType.Element:

    Format (reader, "Element");

    break;

    case XmlNodeType.Text:

    Format (reader, "Text");

    break;

    case XmlNodeType.Whitespace:

    break;

    }

    }

    TextBox3.Text = outputXml.ToString(); }

protected void Format(XmlReader reader, String NodeType)

    {

    // Format the output

    for (int i=0; i < reader.Depth; i++) {

    outputXml.Append('\t');

    }

outputXml.Append(reader.Prefix + NodeType + "<" + reader.Name + ">"

    + reader.Value);

// Display the attributes values for the current node

    if (reader.HasAttributes)

    {

    outputXml.Append(" Attributes:");

for (int j=0; j < reader.AttributeCount; j++)

    {

    outputXml.Append(reader[j]);

    }

    }

    outputXml.Append("\r\n");

    }

/// ************************* DOM *********************************

    protected void ShowDocument(XmlNode node) {

if (node != null)

    Format (node);

if (node.HasChildNodes)

    {

    node = node.FirstChild;

    while (node != null)

    {

    ShowDocument(node);

    node = node.NextSibling;

    }

    }

    }

// Format the output

    private void Format (XmlNode node) {

    if (!node.HasChildNodes)

    {

    outputXml.Append("\t" + "<" + node.Value + ">");

    }

else

    {

    outputXml.Append("<" + node.Name + ">"); if (XmlNodeType.Element == node.NodeType) {

    XmlNamedNodeMap map = node.Attributes; foreach (XmlNode attrnode in map) outputXml.Append(" " + attrnode.Name + "<" + attrnode.Value + ">

    ");

    }

    outputXml.Append("\r\n");

    }

    }

    }

下面就是webform2.aspx

    webform2.aspx

    ----------------------------------- <%@ Import Namespace="System" %> <%@ Import Namespace="System.IO" %> <%@ Assembly Name="System.Xml" %>

<%@ Import Namespace="System.Xml" %>

    <%@ Page Language="C#" Inherits="WebForm2" Src="WebForm2.cs"

    Debug="true" %>

<HTML><HEAD>

<script runat="server" language="C#">

    // Put page script here

    public void On_KeyUp(object sender, System.EventArgs e) {

    Response.Write("Works");

    }

</script>

    <!--<link REL="STYLESHEET" HREF="default.css" TYPE="text/css">--> <TITLE>test</TITLE>

    </HEAD>

<BODY >

<form method="post" action="WebForm2.aspx" runat="server"

    enctype="multipart/form-data">

<div align="left">

    <table>

    <tr>

    <td>XML Document:</td>

    <td><input type=file id="XmlFile" runat=server> FileName:</td>

    <td><asp:label id="FileLabel" runat="server"></asp:label></td> </tr>

<tr>

    <td>XPath Expression</td>

    <td><asp:textbox id=TextBox1 runat="server" Height="20" Width="300"

    text=".//text()" OnKey_Up="On_KeyUp"></asp:textbox></td> <td><asp:button type=submit OnClick="Query_Click" runat="server"

    Height="20" Width="91" text="Query"></asp:button></td> </tr>

    </table>

</br>

<table>

    <tr><td>Output from Query</td><td>XML Data</td><tr>

    <tr><td>Query Display: <asp:dropdownlist runat="server">

    <asp:listitem>Descriptive</asp:listitem>

    <asp:listitem>XML</asp:listitem>

    </asp:dropdownlist>

    </td><tr>

    <tr>

    <td width="50%" valign="top" align="left"><asp:textbox id=TextBox2 runat="server" Height="400" Width="350" TextMode="MultiLine" Rows="10"></asp:textbox></td>

    <td width="50%" valign="top" align="left"><asp:xml id="MyXml" transformsource="test.xsl" runat=server/></asp:xml></td>

    </tr>

    </table>

    </div>

    <td><asp:textbox id=TextBox3 runat="server" Height="1" Width="5" TextMode="MultiLine" Rows="110"></asp:textbox></td>

</form>

</BODY>

    </HTML>

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