I am using C# with Mono, and I want to navigate a XML Schema validated XmlDocument using XPathNavigator. The point being as I traverse the document I can get the XML SChema information for each element via the XPathNavigator.SchemaInfo property. However after I call XPathNavigator.MoveToFirstChild() the XPathNavigator.SchemaInfo = null. Here is an example
using System;
using System.IO;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Schema;
namespace XmlSchemaTest
{
class Program
{
static void Main(string[] args)
{
XmlDocument xmlDocument = ReadAndValidateXmlFile(@"../test.xml", @"../test.xsd");
if (xmlDocument == null)
Console.WriteLine("Cannot open document or it didn't validate.");
else
{
XPathNavigator xpathNavigator = xmlDocument.CreateNavigator();
Console.WriteLine("XPathNavigator.SchemaInfo is " + ((xpathNavigator.SchemaInfo == null) ? "null" : "not null"));
xpathNavigator.MoveToRoot();
Console.WriteLine("Called XPathNavigator.MoveToRoot()");
if(xpathNavigator.MoveToFirstChild())
{
Console.WriteLine("XPathNavigator.LocalName after .MoveToFirstChild() succeeded = " + xpathNavigator.LocalName);
Console.WriteLine("XPathNavigator.NodeType value = " + xpathNavigator.NodeType.ToString());
Console.WriteLine("XPathNavigator.SchemaInfo is " + ((xpathNavigator.SchemaInfo == null) ? "null" : "not null"));
}
}
//Console.ReadLine();
}
private static XmlDocument ReadAndValidateXmlFile(string xmlPath, string xsdPath)
{
// Load the XML Schema
bool anyValidationErrors = false;
XmlSchemaSet oSchemaSet = new XmlSchemaSet();
ValidationEventHandler Handler = new ValidationEventHandler((object sender, ValidationEventArgs args) => {Console.WriteLine(args.Message); anyValidationErrors = true;} );
oSchemaSet.ValidationEventHandler += Handler;
XmlSchema oSchema = null;
using (StreamReader sr = new StreamReader(xsdPath)) {
oSchema = XmlSchema.Read(sr, Handler);
}
if (anyValidationErrors || (oSchema == null)) {
Console.WriteLine("Schema validation errors");
return null;
}
oSchemaSet.Add(oSchema);
// Set up the Xml reader to do schema validation
XmlReaderSettings xmlReaderSettings = new XmlReaderSettings();
xmlReaderSettings.ValidationType = ValidationType.Schema;
xmlReaderSettings.Schemas.Add(oSchemaSet);
anyValidationErrors = false;
xmlReaderSettings.ValidationEventHandler += new ValidationEventHandler((object sender, ValidationEventArgs args) => {Console.WriteLine(args.Message); anyValidationErrors = true;} );
// Load the Xml and validate against schemer
using (XmlReader xmlReader = XmlReader.Create(xmlPath, xmlReaderSettings))
{
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(xmlReader);
if (anyValidationErrors) {
Console.WriteLine("Xml validation errors");
return null;
}
else
return xmlDocument;
}
}
}
}
With this XSD
<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="TEST"
targetNamespace="urn:test"
xmlns:tst="urn:test"
xmlns="urn:test"
elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="TestElement">
<xs:complexType>
<xs:sequence>
<xs:element name="SubEle">
<xs:complexType>
<xs:sequence>
<xs:element name="ChildEle" type="xs:unsignedInt" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
And this XML
<?xml version="1.0" encoding="utf-8" ?>
<tst:TestElement xmlns:tst="urn:test">
<tst:SubEle>
<tst:ChildEle>123</tst:ChildEle>
</tst:SubEle>
</tst:TestElement>
Gives this output
XPathNavigator.SchemaInfo is not null
Called XPathNavigator.MoveToRoot()
XPathNavigator.LocalName after .MoveToFirstChild() succeeded = TestElement
XPathNavigator.NodeType value = Element
XPathNavigator.SchemaInfo is null
Any one have suggestions as to what is going on or what I am doing wrong?
thanks
Dave
PS I say "in mono" because that is what I am using, I haven't been able to confirm on Windows yet. Additionally, it's runtime version is .Net 4.0, happens in Debug and Release.
UPDATE I just tried this on Windows and got this result
XPathNavigator.SchemaInfo is not null
Called XPathNavigator.MoveToRoot()
XPathNavigator.LocalName after .MoveToFirstChild() succeeded = TestElement
XPathNavigator.NodeType value = Element
XPathNavigator.SchemaInfo is not null
Press any key to continue . . .
So maybe a Mono thing?