Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

XmlTextReader _coreReader = new XmlTextReader(fileName);XmlValidatingReader reader = newXmlValidatingReader(_coreReader);You move around the input document using the Read method as usual. Actually, youuse the validating reader as you would any other XML .NET reader. At each step,however, the structure of the currently visited node is validated against the specifiedschema and an exception is raised if an error is found.To validate an entire XML document, you simply loop through its contents, as shownhere:private bool ValidateDocument(string fileName){// Initialize the validating readerXmlTextReader _coreReader = new XmlTextReader(fileName);XmlValidatingReader reader = newXmlValidatingReader(_coreReader);// Prepare for validationreader.ValidationType = ValidationType.Auto;reader.ValidationEventHandler += newValidationEventHandler(MyHandler);// Parse and validate all the nodes in the documentwhile(reader.Read()) {}}// Close the readerreader.Close();return true;The ValidationType property is set to the default value—ValidationType.Auto. In thiscase, the reader determines what type of validation (DTD, XDR, or XSD) is required bylooking at the contents of the file. The caller application is notified of any error through aValidationEventHandler event. In the preceding code, the MyHandler procedure runswhenever a validation error is detected, as shown here:private void MyHandler(object sender, ValidationEventArgs e){// Logs the error that occurredPrintOut(e.Exception.GetType().Name, e.Message);}Figure 3-1 shows the output of the sample program ValidateDocument. The list boxtracks down all the errors that have been detected. The complete code listing for thesample application showing how to set up a validating parser is available in this book'ssample files.66