Looking a little further into this I am not sure that IgnoreWhitespace is the 
solution I want.    Is there any other way to go from an XmlDocument object 
to a XmlReader used for validation?   I am trying to avoid writing a file to 
disk as a part of this process.

"TimB" wrote:

> Thank you.   I am doing wc3 validation though a little differently than your 
> sample.   
> Below is some VB.Net code I used to test with.   "Try1" is using your method 
> as close as I could translate it to VB.   "Try1" has the same results as your 
> test.  "Try2" is how I was doing validation.  I start with a loaded 
> XmlDocument (received via messaging) rather than from a file in the file 
> system.   To get the XML into the XmlReader I first save it to a memory 
> stream and then create the XmlReader with the content of the memory stream.   
> "Try2" does not pick up the validation error on the foo element.   "Try3" is 
> using my method but with the IgnoreWhitespace XMLReaderSetting set to true.  
> "Try3" does pick up both validation errors.    Something about saving the 
> XmlDocument to a memory stream and then creating the XmlReader from that 
> stream must change the white space in the document.   
> 
> This seems to have changed at the time I installed the .Net Framework 
> version 3.5 (Sp1).    I mistakenly believed the problem was caused by the bug 
> identified in article 826753.   Knowing that wasn't the case helped a great 
> deal!
> 
> 
>     Sub main()
>         Dim objXMLDoc As XmlDocument
> 
>         try1("c:\temp\xmlfile1.xml")
> 
>         objXMLDoc = New XmlDocument
>         objXMLDoc.Load("c:\temp\xmlfile1.xml")
>         try2(objXMLDoc)
> 
> 
>         objXMLDoc = New XmlDocument
>         objXMLDoc.Load("c:\temp\xmlfile1.xml")
>         try3(objXMLDoc)
> 
>     End Sub
> 
>     Sub try1(ByVal astrFileName As String)
>         'Validate an xml document.  Pull the document from the file system.
> 
>         System.Console.WriteLine("Try1")
>         Dim objXMLReaderSettigns As XmlReaderSettings = New XmlReaderSettings
>         objXMLReaderSettigns.ValidationType = ValidationType.Schema
>         objXMLReaderSettigns.Schemas.Add(Nothing, "c:\temp\xmlschema1.xsd")
>         AddHandler objXMLReaderSettigns.ValidationEventHandler, AddressOf 
> ValidationCallBack
> 
>         Dim objXMLReader As XmlReader = XmlReader.Create(astrFileName, 
> objXMLReaderSettigns)
> 
>         While objXMLReader.Read
>         End While
> 
>     End Sub
> 
>     Sub try2(ByVal aobjXMLDoc As XmlDocument)
>         'Validate an xml document.  XML Document is alread loaded into an 
> XmlDocument object.
> 
>         System.Console.WriteLine("Try2")
>         Dim objXMLReaderSettigns As XmlReaderSettings = New XmlReaderSettings
>         objXMLReaderSettigns.ValidationType = ValidationType.Schema
>         objXMLReaderSettigns.Schemas.Add(Nothing, "c:\temp\xmlschema1.xsd")
>         AddHandler objXMLReaderSettigns.ValidationEventHandler, AddressOf 
> ValidationCallBack
> 
>         Dim objMemoryStrm As System.IO.Stream = New System.IO.MemoryStream
>         aobjXMLDoc.Save(objMemoryStrm)
>         objMemoryStrm.Position = 0
>         Dim objTextReader As XmlTextReader = New XmlTextReader(objMemoryStrm)
> 
>         Dim objXMLReader As XmlReader = XmlReader.Create(objTextReader, 
> objXMLReaderSettigns)
> 
>         While objXMLReader.Read
>         End While
> 
>     End Sub
> 
>     Sub try3(ByVal aobjXMLDoc As XmlDocument)
>         'Validate an xml document.  XML Document is alread loaded into an 
> XmlDocument object.
> 
>         System.Console.WriteLine("Try3")
>         Dim objXMLReaderSettigns As XmlReaderSettings = New XmlReaderSettings
>         objXMLReaderSettigns.ValidationType = ValidationType.Schema
>         objXMLReaderSettigns.IgnoreWhitespace = True
>         objXMLReaderSettigns.Schemas.Add(Nothing, "c:\temp\xmlschema1.xsd")
>         AddHandler objXMLReaderSettigns.ValidationEventHandler, AddressOf 
> ValidationCallBack
> 
>         Dim objMemoryStrm As System.IO.MemoryStream = New 
> System.IO.MemoryStream
>         aobjXMLDoc.Save(objMemoryStrm)
>         objMemoryStrm.Position = 0
>         Dim objTextReader As XmlTextReader = New XmlTextReader(objMemoryStrm)
> 
>         Dim objXMLReader As XmlReader = XmlReader.Create(objTextReader, 
> objXMLReaderSettigns)
> 
>         While objXMLReader.Read
>         End While
> 
>     End Sub
> 
>     Private Sub ValidationCallBack(ByVal sender As Object, ByVal args As _
>         ValidationEventArgs)
>         'Display the validation error.  This is only called on error
>         System.Console.WriteLine("Validation error: " + args.Message)
>     End Sub
> 
> 
> The following are the results from all 3 tries:
> 
> Try1
> Validation error: The 'foo' element is invalid - The value '' is invalid 
> according to its datatype 'String' - The actual length is less than the 
> MinLength value.
> Validation error: The 'baz' attribute is invalid - The value '' is invalid 
> according to its datatype 'String' - The actual length is less than the 
> MinLength value.
> Try2
> Validation error: The 'baz' attribute is invalid - The value '' is invalid 
> according to its datatype 'String' - The actual length is less than the 
> MinLength value.
> Try3
> Validation error: The 'foo' element is invalid - The value '' is invalid 
> according to its datatype 'String' - The actual length is less than the 
> MinLength value.
> Validation error: The 'baz' attribute is invalid - The value '' is invalid 
> according to its datatype 'String' - The actual length is less than the 
> MinLength value.
> 
> 
> 
> "Martin Honnen" wrote:
> 
> > TimB wrote:
> > > Does anyone know when the issue identified in the following knowledge base 
> > > article will be fixed with a service pack to the .Net Framework version 3.5?
> > > 
> > > http://support.microsoft.com/default.aspx/kb/826753
> > > 
> > > This issue prevents empty elements or attributes that have a minLength 
> > > greater than zero from being identified as validation errors when validating 
> > > an xml document using a schema.
> > 
> > That problem linked to above applies to
> > 
> > •	Microsoft XML Core Services 4.0
> > •	Microsoft XML Core Services 4.0 Service Pack 1
> > •	Microsoft XML Parser 3.0 Service Pack 3
> > •	Microsoft XML Parser 3.0 Service Pack 2
> > •	Microsoft XML Parser 3.0 Service Pack 1
> > •	Microsoft XML Parser 3.0
> > •	Microsoft XML Parser 2.6
> > •	Microsoft XML Parser 2.5
> > •	Microsoft XML Parser 2.0
> > 
> > and not to the .NET framework.
> > 
> > With the .NET framework and a W3C XML schema the problem does not exist:
> > 
> >              XmlReaderSettings xrs = new XmlReaderSettings();
> >              xrs.ValidationType = ValidationType.Schema;
> >              xrs.ValidationEventHandler += delegate(object sender, 
> > ValidationEventArgs vargs)
> >              {
> >                  Console.WriteLine("{0}: {1}", vargs.Severity, 
> > vargs.Message);
> >              };
> >              xrs.Schemas.Add(null, @"..\..\XMLSchema1.xsd");
> > 
> >              using (XmlReader rd = 
> > XmlReader.Create(@"..\..\XMLFile1.xml", xrs))
> >              {
> >                  while (rd.Read()) { }
> >              }
> > 
> > where the schema is as follows:
> > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
> >    <xs:element name="root">
> >      <xs:complexType>
> >        <xs:sequence>
> >          <xs:element name="foo">
> >            <xs:simpleType>
> >              <xs:restriction base="xs:string">
> >                <xs:minLength value="2"/>
> >              </xs:restriction>
> >            </xs:simpleType>
> >          </xs:element>
> >          <xs:element name="bar">
> >            <xs:complexType>
> >              <xs:attribute name="baz" use="required">
> >                <xs:simpleType>
> >                  <xs:restriction base="xs:string">
> >                    <xs:minLength value="2"/>
> >                  </xs:restriction>
> >                </xs:simpleType>
> >              </xs:attribute>
> >            </xs:complexType>
> >          </xs:element>
> >        </xs:sequence>
> >      </xs:complexType>
> >    </xs:element>
> > </xs:schema>
> > 
> > and the instance is as follows:
> > <?xml version="1.0" encoding="utf-8" ?>
> > <root>
> >    <foo></foo>
> >    <bar baz=""/>
> > </root>
> > 
> > 
> > outputs the following two validation errors with Visual Studio 2005:
> > 
> > Error: The 'foo' element is invalid - The value '' is invalid according 
> > to its datatype 'String' - The actual length is less than the MinLength 
> > value.
> > Error: The 'baz' attribute is invalid - The value '' is invalid 
> > according to its datatype 'String' - The actual length is less than the 
> > MinLength value.
> > 
> > 
> > Or are you still using an XDR schema?
> > 
> > -- 
> > 
> > 	Martin Honnen --- MVP XML
> > 	http://JavaScript.FAQTs.com/
> >