ASP.NET中的XML表单控件

来源：互联网发布：0基础cpa 知乎编辑：程序博客网时间：2024/05/19 00:56

T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.
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<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<xsl:sort>，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("</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" %>

<HTML><HEAD>

<script runat="server" language="C#">
// Put page script here
public void On_KeyUp(object sender, System.EventArgs e)
{
Response.Write("Works");
}

</script>


<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>
<script type="text/javascript"></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>