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ASP.NET中的XML表单控件

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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>


<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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