ASP.NET中的XML表单控件

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ASP.NET中的XML表单控件

来源：NET Post Time：2006-03-23 Poster:Colin

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 < 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("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" %> 
 
<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> 
 
 
<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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