Question

The following code helps me validate an XML file with an XSD schema.

XmlReaderSettings settings = new XmlReaderSettings(); settings.Schemas.Add(null, xsdFilePath); settings.ValidationType = ValidationType.Schema; settings.ValidationEventHandler += new System.Xml.Schema.ValidationEventHandler(settings_ValidationEventHandler); XmlDocument document = new XmlDocument(); document.Load(xmlFilePath); XmlReader rdr = XmlReader.Create(new StringReader(document.InnerXml), settings);  while (rdr.Read()) {  } isValid = true; 

The ValidationEventHandler also tells me what the errors are, but doesn’t tell me on ‘where’ or ‘on which line’ they are located. Is there any way to get the line number where the XML fails to be validated?

Answer 1

Would not this do what you are after ?

Create an XmlReaderSettings object and enable warnings through that object.

Unfortunately, there seems to be no way to pass your own XmlReaderSettings object to XmlDocument.Validate().
Instead, you can use a validating XmlReader and an XmlNodeReader to validate an existing XmlDocument (using a XmlNodeReader with StringReader rather than an XmlDocument)

XmlDocument x = new XmlDocument(); x.LoadXml(XmlSource);  XmlReaderSettings settings = new XmlReaderSettings(); settings.CloseInput = true;      settings.ValidationEventHandler += Handler;  settings.ValidationType = ValidationType.Schema; settings.Schemas.Add(null, ExtendedTreeViewSchema); settings.ValidationFlags =      XmlSchemaValidationFlags.ReportValidationWarnings | XmlSchemaValidationFlags.ProcessIdentityConstraints | XmlSchemaValidationFlags.ProcessInlineSchema | XmlSchemaValidationFlags.ProcessSchemaLocation ;  StringReader r = new StringReader(XmlSource);  using (XmlReader validatingReader = XmlReader.Create(r, settings)) {         while (validatingReader.Read()) { /* just loop through document */ } } 

And the handler:

private static void Handler(object sender, ValidationEventArgs e) {         if (e.Severity == XmlSeverityType.Error || e.Severity == XmlSeverityType.Warning)           System.Diagnostics.Trace.WriteLine(             String.Format("Line: {0}, Position: {1} \"{2}\"",                 e.Exception.LineNumber, e.Exception.LinePosition, e.Exception.Message)); }