XmlValidatingReader.ValidationType Proprietà
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Ottiene o imposta un valore che indica il tipo di convalida da eseguire.
public:
property System::Xml::ValidationType ValidationType { System::Xml::ValidationType get(); void set(System::Xml::ValidationType value); };public System.Xml.ValidationType ValidationType { get; set; }member this.ValidationType : System.Xml.ValidationType with get, setPublic Property ValidationType As ValidationTypeValore della proprietà
Uno dei valori di ValidationType. Se questa proprietà non viene impostata, per impostazione predefinita verrà usato ValidationType.Auto.
Eccezioni
La proprietà è stata impostata una volta eseguita la chiamata al metodo Read.
Esempio
Nell'esempio seguente vengono convalidati due file.
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Schema;
public ref class Sample
{
private:
XmlTextReader^ txtreader;
XmlValidatingReader^ reader;
Boolean m_success;
public:
Sample()
{
txtreader = nullptr;
reader = nullptr;
m_success = true;
String^ doc1 = "notValid.xml";
String^ doc2 = "cdDTD.xml";
String^ doc3 = "book1.xml";
//Parse the files and validate when requested.
Validate( doc1, ValidationType::XDR ); //Validation should fail.
Validate( doc2, ValidationType::DTD ); //Validation should fail.
Validate( doc3, ValidationType::None ); //No validation performed.
}
private:
void Validate( String^ filename, ValidationType vt )
{
try
{
//Implement the readers. Set the ValidationType.
txtreader = gcnew XmlTextReader( filename );
reader = gcnew XmlValidatingReader( txtreader );
reader->ValidationType = vt;
//If the reader is set to validate, set the event handler.
if ( vt == ValidationType::None )
Console::WriteLine( "\nParsing XML file {0}", filename );
else
{
Console::WriteLine( "\nValidating XML file {0}", filename );
m_success = true;
//Set the validation event handler.
reader->ValidationEventHandler += gcnew ValidationEventHandler( this, &Sample::ValidationCallBack );
}
// Read XML data
while ( reader->Read() )
{}
if ( vt == ValidationType::None )
Console::WriteLine( "Finished parsing file." );
else
Console::WriteLine( "Validation finished. Validation {0}", m_success ? (String^)"successful" : "failed" );
}
finally
{
//Close the reader.
if ( reader != nullptr )
reader->Close();
}
}
//Display the validation errors.
void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ args )
{
m_success = false;
Console::Write( "\r\n\tValidation error: {0}", args->Message );
}
};
int main()
{
gcnew Sample;
}
using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;
public class Sample
{
private const String doc1 = "notValid.xml";
private const String doc2 = "cdDTD.xml";
private const String doc3 = "book1.xml";
private XmlTextReader txtreader = null;
private XmlValidatingReader reader = null;
private Boolean m_success = true;
public Sample ()
{
//Parse the files and validate when requested.
Validate(doc1, ValidationType.XDR); //Validation should fail.
Validate(doc2, ValidationType.DTD); //Validation should fail.
Validate(doc3, ValidationType.None); //No validation performed.
}
public static void Main ()
{
Sample validation = new Sample();
}
private void Validate(String filename, ValidationType vt)
{
try
{
//Implement the readers. Set the ValidationType.
txtreader = new XmlTextReader(filename);
reader = new XmlValidatingReader(txtreader);
reader.ValidationType = vt;
//If the reader is set to validate, set the event handler.
if (vt==ValidationType.None)
{
Console.WriteLine("\nParsing XML file " + filename.ToString());
}
else
{
Console.WriteLine("\nValidating XML file " + filename.ToString());
m_success = true;
//Set the validation event handler.
reader.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
}
// Read XML data
while (reader.Read()){}
if (vt==ValidationType.None)
Console.WriteLine("Finished parsing file.");
else
Console.WriteLine ("Validation finished. Validation {0}", (m_success==true ? "successful" : "failed"));
}
finally
{
//Close the reader.
if (reader != null)
reader.Close();
}
}
//Display the validation errors.
private void ValidationCallBack (object sender, ValidationEventArgs args)
{
m_success = false;
Console.Write("\r\n\tValidation error: " + args.Message);
}
}
Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Public Class Sample
Private doc1 As String = "notValid.xml"
Private doc2 As String = "cdDTD.xml"
Private doc3 As String = "book1.xml"
Private txtreader As XmlTextReader = Nothing
Private reader As XmlValidatingReader = Nothing
Private m_success As Boolean = True
Public Sub New()
'Parse the files and validate when requested.
Validate(doc1, ValidationType.XDR) 'Validation should fail.
Validate(doc2, ValidationType.DTD) 'Validation should fail.
Validate(doc3, ValidationType.None) 'No validation performed.
End Sub
Public Shared Sub Main()
Dim validation As New Sample()
End Sub
Private Sub Validate(filename As String, vt As ValidationType)
Try
'Implement the readers. Set the ValidationType.
txtreader = New XmlTextReader(filename)
reader = New XmlValidatingReader(txtreader)
reader.ValidationType = vt
'If the reader is set to validate, set the event handler.
If vt = ValidationType.None Then
Console.WriteLine(ControlChars.Cr & "Parsing XML file " & filename.ToString())
Else
Console.WriteLine(ControlChars.Cr & "Validating XML file " & filename.ToString())
m_success = True
'Set the validation event handler.
AddHandler reader.ValidationEventHandler, AddressOf ValidationCallBack
End If
' Read XML data
While reader.Read()
End While
If vt = ValidationType.None Then
Console.WriteLine("Finished parsing file.")
Else
Console.WriteLine("Validation finished. Validation {0}", IIf(m_success, "successful", "failed"))
End If
Finally
'Close the reader.
If Not (reader Is Nothing) Then
reader.Close()
End If
End Try
End Sub
'Display the validation errors.
Private Sub ValidationCallBack(sender As Object, args As ValidationEventArgs)
m_success = False
Console.Write(ControlChars.CrLf & ControlChars.Tab & "Validation error: " & args.Message)
End Sub
End Class
L'esempio usa i quattro file di input seguenti:
notValid.xml Il prefisso "x-schema:" identifica lo schema XML-Data Ridotto (XDR) per il lettore.
<?xml version='1.0'?>
<bookstore xmlns="x-schema:schema1.xdr">
<book genre="novel" style="hardcover">
<title>The Handmaid's Tale</title>
<author>
<first-name>Margaret</first-name>
<last-name>Atwood</last-name>
</author>
<price>19.95</price>
</book>
<book genre="novel" style="other">
<title>The Poisonwood Bible</title>
<author>
<first-name>Barbara</first-name>
<last-name>Kingsolver</last-name>
</author>
<price>11.99</price>
</book>
</bookstore>
schema1.xdr
<?xml version="1.0"?>
<Schema xmlns="urn:schemas-microsoft-com:xml-data"
xmlns:dt="urn:schemas-microsoft-com:datatypes">
<ElementType name="first-name" content="textOnly"/>
<ElementType name="last-name" content="textOnly"/>
<ElementType name="name" content="textOnly"/>
<ElementType name="price" content="textOnly" dt:type="fixed.14.4"/>
<ElementType name="author" content="eltOnly" order="one">
<group order="seq">
<element type="name"/>
</group>
<group order="seq">
<element type="first-name"/>
<element type="last-name"/>
</group>
</ElementType>
<ElementType name="title" content="textOnly"/>
<AttributeType name="genre" dt:type="string"/>
<AttributeType name="style" dt:type="enumeration"
dt:values="paperback hardcover"/>
<ElementType name="book" content="eltOnly">
<attribute type="genre" required="yes"/>
<attribute type="style" required="yes"/>
<element type="title"/>
<element type="author"/>
<element type="price"/>
</ElementType>
<ElementType name="bookstore" content="eltOnly">
<element type="book"/>
</ElementType>
</Schema>
cdDTD.xml
<!--XML file using a DTD-->
<!DOCTYPE bookstore [
<!ELEMENT bookstore (cd)*>
<!ELEMENT cd (title,artist,price)>
<!ATTLIST cd genre CDATA #REQUIRED>
<!ELEMENT title (#PCDATA)>
<!ELEMENT artist (#PCDATA)>
<!ELEMENT price (#PCDATA)>]>
<bookstore>
<cd genre="alternative" ISBN="2-3631-4">
<title>Americana</title>
<artist>Offspring</artist>
<price>16.95</price>
</cd>
</bookstore>
book1.xml
<?xml version='1.0' ?>
<!DOCTYPE book [<!ENTITY h 'hardcover'>]>
<book>
<title>Pride And Prejudice</title>
<misc>&h;</misc>
</book>
Commenti
Nota
La XmlValidatingReader classe è obsoleta in .NET Framework 2.0. È possibile creare un'istanza di XmlReader convalida usando la XmlReaderSettings classe e il Create metodo . Per altre informazioni, vedere la sezione Note della pagina di riferimento XmlReader.
Questa proprietà deve essere impostata prima della prima chiamata a Read. L'impostazione di questa proprietà su ValidationType.None crea un lettore non convalidante.
Se per la convalida sono necessarie definizioni di tipi di documento (DTD) o schemi esterni, viene usato .XmlResolver