XML validation using XMLReader not working

Question

I am trying to use the XMLReader to validate xml data with an xsd file.  The method runs without error but the validation does not happen.  The following is the code I am running and the xml and xsd files I am testing with.  I change an element name in the data for test purposes but a validation event is not raised.  If the xml data is changed so that the xml is not well formed I get a system exception raised.  So it appears that the validation using the xsd does not work.

using

 

System;

using

 

System.Collections;

using

 

System.Data;

using

 

System.IO;

using

 

System.Xml;

using

 

System.Xml.Schema;

using

 

System.Text;

namespace

 

XMLValidationProviderClassLibrary

{

 

public class

XMLValidator

{

 

// Validation Error Count

 

static int

ErrorsCount = 0;

 

// Validation Error Message

 

static string ErrorMessage = ""

;

 

public static void ValidationHandler(object sender, ValidationEventArgs

args)

{

ErrorMessage = ErrorMessage + args.Message +

"\r\n"

;

ErrorsCount++;

}

 

public string Validate(string XMLPath, string

XSDPath)

{

 

try

{

 

XmlReaderSettings objSettings = new XmlReaderSettings

();

objSettings.Schemas.Add(

null, XmlReader

.Create(XSDPath));

objSettings.ValidationFlags =

XmlSchemaValidationFlags

.ReportValidationWarnings;

objSettings.ValidationEventHandler +=

new ValidationEventHandler

(ValidationHandler);

objSettings.IgnoreComments =

true

;

objSettings.IgnoreWhitespace =

true

;

 

using (XmlReader myReader = XmlReader

.Create(XMLPath, objSettings))

{

 

while

(myReader.Read());

myReader.Close();

}

 

// Raise exception, if XML validation fails

 

if

(ErrorsCount > 0)

{

 

return

ErrorMessage;

}

 

else

{

 

return "XML validation succeeded."

;

}

}

 

catch (Exception

error)

{

 

// XML Validation errored

 

string

errMsg = error.ToString();

 

return errMsg + "\r\n"

+ ErrorMessage;

}

}

}

}

Product.xml

<?xml version="1.0" encoding="utf-8"?>
<Product ProductID="123">
  <ProductName>Rugby jersey</ProductName>
</Product>

Product.xsd

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <xsd:element name="Product">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element name="ProductName" type="xsd:string"/>
   </xsd:sequence>
   <xsd:attribute name="ProductID" use="required" type="xsd:int"/>
  </xsd:complexType>
 </xsd:element>
</xsd:schema>

I have tried several different xml and xsd samples with the same result.

What is wrong here?

Thanks.

 

Answer 1

Well,

If you have an .xsd and an .xml file, use the dataset object.

You can use the methods ds.ReadXML and ds.ReadXMLSchema

Adam

---

Ctrl+Z

Answer 2

You missed one line: objSettings.ValidationType = ValidationType.Schema;

Set the ValidationEventHandler is not enough, you have to set the ValidationType.

 

I reformat your code a liitle bit as follow:

try
      {
        XmlReaderSettings objSettings = new XmlReaderSettings();
        objSettings.Schemas.Add(null, XmlReader.Create("Product.xsd"));
        objSettings.ValidationType = ValidationType.Schema;
        objSettings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings;
        objSettings.ValidationEventHandler += new ValidationEventHandler(ValidationHandler);
        objSettings.IgnoreComments = true;
        objSettings.IgnoreWhitespace = true;
        using (XmlReader myReader = XmlReader.Create("Product.xml", objSettings))
        {
          while (myReader.Read()) ;
          myReader.Close();
        }

      }
      catch (Exception error)
      {

        // XML Validation errored
        string errMsg = error.ToString();
        Console.WriteLine(errMsg);
      }