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
-
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 + "<" + name + ">" + 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.Name + ">" + 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" + "<" + 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("rn");

}

}

}





下面就是webform2.aspx了

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" %>

XML Document:	FileName:
XPath Expression

Output from Query	XML Data
Query Display: Descriptive XML