How to check XML document on DTD in C #?

Question

I don’t want to do anything, I just want to make sure the document is valid, and print an error message if it is not. Google pointed me to this one , but it looks like the XmlValidatingReader is out of date (at least what MonoDevelop tells me).

Edit: I'm trying to ask Mehrdad, but I have problems. I think I have most of this, but I cannot find OnValidationEvent anywhere. Where can I get an OnValidationEvent?

XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.DTD;
settings.ValidationEventHandler += new ValidationEventHandler(/*trouble is here*/);
XmlReader validatingReader = XmlReader.Create(fileToLoad, settings);

Answer 1

, XmlValidatingReader class, XmlReaderSettings object XmlReader.Create method:

var settings = new XmlReaderSettings { ValidationType = ValidationType.DTD };
settings.ValidationEventHandler += new ValidationEventHandler(OnValidationEvent);
var reader = XmlReader.Create("file.xml", settings);

.

P.S. OnValidationEvent - , . , , , XmlReader.

Answer 2

var messages = new StringBuilder();
var settings = new XmlReaderSettings { ValidationType = ValidationType.DTD };
settings.ValidationEventHandler += (sender, args) => messages.AppendLine(args.Message);
var reader = XmlReader.Create("file.xml", settings);

if (messages.Length > 0)
{
    // Log Validation Errors
    // Throw Exception
    // Etc.
}

ValidationEventHandler

-

Answer 3

:

• Visual Studio.NET Visual # Console ValidateXml. 1.cs :

  using System.Xml;        // for XmlTextReader and XmlValidatingReader
  using System.Xml.Schema; // for XmlSchemaCollection (which is used later)
  

• Class1.cs isValid Main :

  private static bool isValid = true;      // If a validation error occurs,
                                           // set this flag to false in the
                                           // validation event handler. 
  

• XmlTextReader XML- Main, XmlValidatingReader XML :

  XmlTextReader r = new XmlTextReader("C:\\MyFolder\\ProductWithDTD.xml");
  XmlValidatingReader v = new XmlValidatingReader(r);
  

• ValidationType XmlValidatingReader (DTD, XDR ). DTD :

  v.ValidationType = ValidationType.DTD;
  

• , . ( MyValidationEventHandler 7):

  v.ValidationEventHandler += 
     new ValidationEventHandler(MyValidationEventHandler);
  

• XML-. , MyValidationEventHandler . isValid false (. 8). isValid , , .

  while (v.Read())
  {
     // Can add code here to process the content.
  }
  v.Close();
  
  // Check whether the document is valid or invalid.
  if (isValid)
     Console.WriteLine("Document is valid");
  else
     Console.WriteLine("Document is invalid");
  

• MyValidationEventHandler Main :

  public static void MyValidationEventHandler(object sender, 
                                              ValidationEventArgs args) 
  {
     isValid = false;
     Console.WriteLine("Validation event\n" + args.Message);
  }
  

. , XML . :. Visual Studio.NET ProductWithDTD.xml (, <AuthorName>M soliman</AuthorName>). . :

Validation event
Element 'Product' has invalid content. Expected 'ProductName'.
An error occurred at file:///C:/MyFolder/ProductWithDTD.xml(4, 5).
Document is invalid