| 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. 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> <!--<link REL="STYLESHEET" HREF="default.CSS" TYPE="text/css">--> <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> 注意：联系我时，请一定说明是从【S】看到的信息，谢谢。 |
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