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("
");
}
// 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("
");
}
// ********************************** 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(' ');
}
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("
");
}
/// ************************* 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(" " + "<" + 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("
");
}
}
}
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>
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