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Jeffrey Palermo (.com) » Simplest way to validate Xml against a Xml Schema - level 200
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Simplest way to validate Xml against a Xml Schema - level 200

There are plenty of articles out that explaining how to validate Xml, but they all seem to use namespaces or have other factors in them.  I didn't find one that used plain Xml with no namespace declaration, so I whipped up a little example.  I included the Xml and Xsd inline and load it using a StringReader, but for your purposes, they would probably be in physical files.

            string xsd;

            string xml;

            xsd = @"<xs:schema xmlns:xs=""http://www.w3.org/2001/XMLSchema"">

                        <xs:element name=""address"">

                        <xs:complexType>

                        <xs:sequence>

                        <xs:element name=""name"" type=""xs:string""/>

                        <xs:element name=""street"" type=""xs:string""/>

                        <xs:element name=""city"" type=""xs:string""/>

                        <xs:element name=""country"" type=""xs:string""/>

                        </xs:sequence>

                        </xs:complexType>

                        </xs:element>

                        </xs:schema>";

            xml = @"<?xml version=""1.0""?>

                        <address>

                        <name>John Smith</name>

                        <street>109 Abbey Close</street>

                        <city>Hayes</city>

                        <country> UK</country>

                        </address>";

 

            XmlValidatingReader   vr   = null;

            vr = new XmlValidatingReader(new XmlTextReader(new StringReader(xml)));

            vr.Schemas.Add(null, new XmlTextReader(new StringReader(xsd)));

            vr.ValidationType = ValidationType.Schema;

            vr.ValidationEventHandler += new ValidationEventHandler(vr_ValidationEventHandler);

 

            // Validate XML data

 

            try{

                while(vr.Read());

            }catch{

                Console.WriteLine("Xml Document is not well-formed.");

            }finally{

                vr.Close();

            }

Posted 12-10-2004 6:56 AM by Jeffrey Palermo

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Comments

Jitendra kumar wrote re: Simplest way to validate Xml against a Xml Schema - level 200
on 12-28-2004 11:04 PM
Hi sir,

I tried to use your code in my application but it gives error in the following line.


vr.ValidationEventHandler += new ValidationEventHandler(vr_ValidationEventHandler);


I am requesting you to please send me the solution if you got.


Thanks for help.

Regards,
Jitendra kumar
jkumar@rategain.com

Marlon wrote re: Simplest way to validate Xml against a Xml Schema - level 200
on 01-28-2005 10:20 PM
Try using the following code

private void vr_ValidationEventHandler(object sender, ValidationEventArgs e)
{
// Report error(s) to the console...
Console.WriteLine(e.Exception.Message);
Console.WriteLine(e.Exception.LineNumber);
}