Microsoft KB Archive/937320

= FIX: Error message when you call the &quot;System.Xml.Xsl.XslTransform.Transform&quot; method two times in a .NET Framework 2.0-based application: &quot;Circular reference in the definition of variable &quot; =

Article ID: 937320

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft .NET Framework 2.0

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SYMPTOMS
In a Microsoft .NET Framework 2.0-based application, you call the System.Xml.Xsl.XslTransform.Transform method to transform XML data from a style sheet. When you call this method again, you may receive the following error message:

System.Xml.Xsl.XsltException: Circular reference in the definition of variable

This problem occurs when the style sheet contains a forward reference to a global variable.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next .NET Framework 2.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
You must have the .NET Framework 2.0 installed to apply this hotfix.

Restart requirement
You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

The .NET Framework 2.0, x64-based versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates



Steps to reproduce the problem
 Start Microsoft Visual Studio 2005. On the File menu, click New Project. Under Project types, click Visual C#. Under Templates, click Console Application. Type a project name, and then click OK.  In the Program.cs file, replace the existing code with the following code. using System.Xml.Xsl;

class Repro { static void Main(string[] args) { XslTransform trans = new XslTransform; trans.Load(&quot;repro.xsl&quot;); trans.Transform(&quot;repro.xsl&quot;, &quot;repro1.out&quot;); trans.Transform(&quot;repro.xsl&quot;, &quot;repro.out&quot;); } } </li>  Create a style sheet that contains the following code. <xsl:stylesheet version=&quot;1.0&quot; xmlns:xsl=&quot;http://www.w3.org/1999/XSL/Transform&quot;> <xsl:variable name=&quot;variable1&quot; select=&quot;$variable2&quot;/> <xsl:variable name=&quot;variable2&quot;/> </xsl:stylesheet> </li> Save the style sheet that you created in step 7 as Frame.htm.</li> Save the style sheet to the following folder:

\Bin\Debug

</li> Run the application.</li></ol>

<div class="moreinformation_section">

Call Stack Information
<pre class="fixed_text">Unhandled Exception: System.Xml.Xsl.XsltException: Circular reference in the definition of variable 'variable2'. at System.Xml.Xsl.XsltOld.Processor.GetVariableValue(VariableAction variable) at System.Xml.Xsl.XsltOld.XsltCompileContext.EvaluateVariable(VariableAction variable) at System.Xml.Xsl.XsltOld.VariableAction.System.Xml.Xsl.IXsltContextVariable.Evaluate(XsltContext xsltContext) at MS.Internal.Xml.XPath.VariableQuery.Evaluate(XPathNodeIterator nodeIterator) at System.Xml.Xsl.XsltOld.Processor.RunQuery(ActionFrame context, Int32 key) at System.Xml.Xsl.XsltOld.VariableAction.Execute(Processor processor, ActionFrame frame) at System.Xml.Xsl.XsltOld.ActionFrame.Execute(Processor processor) at System.Xml.Xsl.XsltOld.Processor.Execute at System.Xml.Xsl.XsltOld.Processor.Execute(Stream stream) at System.Xml.Xsl.XslTransform.Transform(XPathNavigator input, XsltArgumentList args, Stream output, XmlResolver resolver) at System.Xml.Xsl.XslTransform.Transform(String inputfile, String outputfile, XmlResolver resolver) at System.Xml.Xsl.XslTransform.Transform(String inputfile, String outputfile) at Repro.Main(String[] args)

Keywords: kbfix kbqfe kbpubtypekc kbexpertiseadvanced kbhotfixserver KB937320

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