Microsoft KB Archive/870722

= FIX: Duplicate import schema may cause the XML schema compilation to fail =

Article ID: 870722

Article Last Modified on 4/7/2006

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APPLIES TO


 * Microsoft .NET Framework 1.0
 * Microsoft .NET Framework 1.1

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SYMPTOMS
When a duplicate import schema is encountered during compilation, System.xml may throw the following error message:

Item has already been added. Key in dictionary:&quot;file:/// &quot; Key being added: &quot;file:///C:/C.xsd&quot;

Notes  In the previous error message,  is the duplicate schema. This hotfix cannot be applied on a system that is running the Microsoft .NET Framework 1.1 Service Pack 1. If you installed the .NET Framework 1.1 Service Pack 1 and are experiencing the symptoms that are described in this article, request the hotfix rollup package that is described in Microsoft Knowledge Base article 890673 to obtain a resolution. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

890673 Availability of the .NET Framework 1.1 Post-Service Pack 1 XML Web services and XML Messaging hotfix rollup package 8





RESOLUTION
Although this problem occurs in both the Microsoft .NET Framework 1.0 and in the .NET Framework 1.1, this resolution only applies to the .NET Framework 1.1.

To apply this hotfix, your computer must be running the .NET Framework 1.1.

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it 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 Microsoft .NET Framework 1.1 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product 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. 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 tool in Control Panel.    Date         Time   Version            Size    File name --  29-Jun-2004  02:42  1.1.4322.1059     258,048  Aspnet_isapi.dll 29-Jun-2004 02:42  1.1.4322.1059      20,480  Aspnet_regiis.exe 29-Jun-2004 02:42  1.1.4322.1059      32,768  Aspnet_state.exe 29-Jun-2004 02:42  1.1.4322.1059      32,768  Aspnet_wp.exe 14-Jun-2004 21:45                     33,718  Installpersistsqlstate.sql 14-Jun-2004 21:45                     34,342  Installsqlstate.sql 14-Jun-2004 21:45                     35,243  Installsqlstatetemplate.sql 24-May-2004 23:04  1.0.3705.0        106,496  Netfxupdate.exe 29-Jun-2004 02:42  1.1.4322.1059      94,208  Perfcounter.dll 24-May-2004 23:04  1.1.4322.573      102,400  Setregni.exe 14-Jun-2004 21:45                      8,685  Smartnav.js   29-Jun-2004  02:42  1.1.4322.1059   1,224,704  Sy52106.dll 29-Jun-2004 02:42  1.1.4322.1059     241,664  System.messaging.dll 29-Jun-2004 02:42  1.1.4322.1059     323,584  System.runtime.remoting.dll 29-Jun-2004 02:42  1.1.4322.1059     131,072  System.runtime.serialization.formatters.soap.dll 29-Jun-2004 02:42  1.1.4322.1059   1,257,472  System.web.dll 29-Jun-2004 02:42  1.1.4322.1059     819,200  System.web.mobile.dll 29-Jun-2004 02:42  1.1.4322.1059     569,344  System.web.services.dll 29-Jun-2004 02:42  1.1.4322.1059   1,339,392  System.xml.dll 24-May-2004 23:04  1.1.4322.573      118,784  Togac.exe 14-Jun-2004 21:45                      2,119  Uninstallsqlstatetemplate.sql 14-Jun-2004 21:45                     14,482  Webuivalidation.js



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



MORE INFORMATION
This problem may occur when you compile a duplicate schema, such as the following:

A.xsd imports B.xsd and C.xsd, and then B.xsd also imports C.xsd.

Steps to reproduce the problem
 Create a Microsoft Visual Studio .NET 2003 or a Visual Studio .NET 2002 Windows Forms application. Add a button to the default form.</li>  Add the following methods to the default Form class

void LoadSchemas {           try {               //A.xsd imports B.xsd and C.xsd, and then, B.xsd imports C.xsd. XmlSchema schemaA = LoadSchema(@&quot;C:\A.xsd&quot;); schemaA.Compile(null);

XmlSchema schemaC = ((XmlSchemaExternal)schemaA.Includes[0]).Schema; XmlSchema schemaB = ((XmlSchemaExternal)schemaA.Includes[1]).Schema;

((XmlSchemaExternal)schemaB.Includes[0]).Schema = schemaC; schemaA.Compile(new ValidationEventHandler(ValidationCallBack)); }           catch(Exception ex) {               MessageBox.Show(ex.Message); }       }        internal void ValidationCallBack(object sender, ValidationEventArgs args) {           System.Diagnostics.Debug.WriteLine(args.Message); MessageBox.Show(args.Message); }

static XmlSchema LoadSchema(string fileName) {              XmlTextReader xmlTxtReader = null; XmlSchema xmlSchema = null; try {                  xmlTxtReader = new System.Xml.XmlTextReader(fileName); xmlSchema = XmlSchema.Read(xmlTxtReader, null); }           finally {               if (xmlTxtReader != null) xmlTxtReader.Close; }           return xmlSchema; } </li>  Change the button1_Click event handler as follows: private void button1_Click(object sender, System.EventArgs e)       { LoadSchemas; } </li> Run the application.

You may receive the error message that is mentioned in the &quot;Symptoms&quot; section.</li></ol>

Keywords: kbqfe kbhotfixserver kbbug kbfix KB870722

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