ASP.NET中的XML表单控件_MySQL

导 读：介绍了有关ASP.NET中XML控件的使用,有个小BUG:在WEBFORM.ASPX中出现的XML控件,其中的transformsource属性设定了样式表文件路径,可是在文章出处没有找到这个XSL文件.:( 自己解决吧.
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在这个代码中揭示了微软在ASP.NET架构中隐藏的一个WEB表单控件，即，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，当然，亦不能使用那个order-by了，因为它支持的xsl空间是带"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，就可以全部转向xml+xsl了，而不用再为源代码保密问题头疼了。
请看下例：
webform2.cs
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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("

"+ exp.Message+"
");

            }

            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("
"+ exp.Message+"
");

            }

            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("rn");

    }



    // 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 + "" + value);

        outputQ.Append("rn");

    }



// ********************************** 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
        {

            outputXml.Append(t);

        }



        outputXml.Append(reader.Prefix + NodeType + "" + reader.Value);



        // Display the attributes values for the current node

        if (reader.HasAttributes)

        {

            outputXml.Append(" Attributes:");



            for (int j=0; j
            {

                outputXml.Append(reader[j]);

            }

        }

        outputXml.Append("rn");

    }



    /// ************************* 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" + "");

        }



        else

        {

            outputXml.Append("");

            if (XmlNodeType.Element == node.NodeType)

            {

                XmlNamedNodeMap map = node.Attributes;

                foreach (XmlNode attrnode in map)

                    outputXml.Append(" " + attrnode.Name + " ");

            }

            outputXml.Append("rn");

        }

    }

}





下面就是webform2.aspx了

webform2.aspx

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XML Document:	FileName:
XPath Expression

 

 

 

   

   

 

Output from Query	XML Data
Query Display:                          Descriptive                          XML