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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)