Part-2( XSLT IN DOTNET)

http://in.geocities.com/rsramsam/xslt.htm

PART-2

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XSLT IN DOTNET PLATFORM

( DESKTOP-C# & ASP.net-C#)

We will now see three methods by which we can implement

such xsl transformation in ASP.net.

a) asp style modified as aspx

b) using asp.net's asp:xml tag

c) by using standard XML classes in DotNet Framework.

a) asp style modified for asp.net

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The following aspx file is a slight modification of familiar asp files.In aspx we have to declare variables before defining. Also , there is no 'set' or 'get' methods.

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// d:\inetpub\wwwroot\xsldemo.aspx

dim xml as object

xml=server.createobject("microsoft.xmldom")

xml.load(Server.MapPath("students.xml"))

dim xsl as object

xsl=server.createobject("microsoft.xmldom")

xsl.load(Server.MapPath("xsl1.xsl"))

response.write(xml.transformNode(xsl))

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We can start the IIS-5 server( normally it will be running).We should remember to place the xml & xsl file in the same folder.If we type the URL as "http://localhost/xsldemo.aspx",

we get correct result ( ie) the xml is transformed as per xsl1.xsl and the result is displayed as a table with yellow background.

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It may be noticed that the above code is in VB.net! Actually, it is asp code retrofitted for asp.net!The default language for ASP.net is VB.net and that is why we are able to be indifferent to uppercase & lowercase.We can display the result in any browser.

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b) using asp:xml tag in asp.net

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There is a far simpler and elegant method in ASP.net by using asp:xml tag , as illustrated below.

// d:\inetpub\wwwroot\xsldemo1.aspx

<%@ page language="c#" debug="true" %>

<%@ import Namespace="System.Xml" %>

<%@ import Namespace="System.Xml.Xsl" %>

<%@ import Namespace="System.Xml.XPath" %>

<%@ import Namespace="System.IO" %>

void job1(Object o,EventArgs e)

{

xmldso.DocumentSource="students.xml";

xmldso.TransformSource="xsl1.xsl";

}

</script>

<html>

<body>

<asp:xml id=xmldso runat=server />

<asp:button text="click" onclick=job1

runat=server />

</form>

</body>

</html>

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Before taking up the code for classical xml-transform in asp.net, we can see how it is done in console-mode c#.

The same packages are referenced in both .

The console-mode c# program follows:

// trax.cs

using System;

using System.Xml;

using System.Xml.Xsl;

using System.Xml.XPath;

using System.IO;

using System.Text;

class trax

{

public static void Main(String [] args)

{

StreamReader reader =

new StreamReader("students.xml");

XmlTextReader xmlreader =

new XmlTextReader(reader);

XPathDocument doc =

new XPathDocument(xmlreader);

XslTransform xsldoc=

new XslTransform();

xsldoc.Load("xsl1.xsl");

StreamWriter writer =

new StreamWriter("result1.htm");

xsldoc.Transform(doc,null,writer);

Console.WriteLine("result sent to file!");

reader.Close();

xmlreader.Close();

}

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As we have installed DotNet Framework SDK1.1 in our system, we get default path to DotNet binaries. Therefore we can compile the above file from any folder.

We will assume that we have created the above file

in g:\c#demo as trax.cs.

g:\c#demo>csc trax.cs

This will compile correctly.

Ensure that students.xml and xsl1.xsl are available in current folder.

g:\c#demo>trax

(This will run the program and we get the message result sent to file).We can now easily write similar code to asp.Net as shown below. Carefully note how the 'using'

in DeskTop-C# is written as 'import Namespace' in ASP.Net.)

//d:/inetpub/wwwroot/trax.aspx

<%@ page language="c#" debug="true" %>

<%@ Import Namespace="System.Xml" %>

<%@ Import Namespace="System.Xml.Xsl" %>

<%@ Import Namespace="System.Xml.XPath" %>

<%@ Import Namespace="System.IO" %>

public void Page_Load()

{

StreamReader reader=

new StreamReader(Server.MapPath("students.xml"));

XmlTextReader xmlreader=

new XmlTextReader(reader);

XPathDocument doc=