XmlValidatingReader.Schemas Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene un objeto XmlSchemaCollection que se va a usar para validación.
public:
property System::Xml::Schema::XmlSchemaCollection ^ Schemas { System::Xml::Schema::XmlSchemaCollection ^ get(); };
public System.Xml.Schema.XmlSchemaCollection Schemas { get; }
member this.Schemas : System.Xml.Schema.XmlSchemaCollection
Public ReadOnly Property Schemas As XmlSchemaCollection
Valor de propiedad
XmlSchemaCollection
que se va a usar para validación.
Ejemplos
En el ejemplo siguiente se validan tres archivos XML mediante esquemas almacenados en XmlSchemaCollection.
#using <System.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Schema;
public ref class SchemaCollectionSample
{
private:
XmlTextReader^ reader;
XmlValidatingReader^ vreader;
Boolean m_success;
public:
SchemaCollectionSample()
{
reader = nullptr;
vreader = nullptr;
m_success = true;
//Load the schema collection.
XmlSchemaCollection^ xsc = gcnew XmlSchemaCollection;
String^ schema = "books.xsd";
String^ schema1 = "schema1.xdr";
xsc->Add( "urn:bookstore-schema", schema ); //XSD schema
xsc->Add( "urn:newbooks-schema", schema1 ); //XDR schema
String^ doc1 = "booksSchema.xml";
String^ doc2 = "booksSchemaFail.xml";
String^ doc3 = "newbooks.xml";
//Validate the files using schemas stored in the collection.
Validate( doc1, xsc ); //Should pass.
Validate( doc2, xsc ); //Should fail.
Validate( doc3, xsc ); //Should fail.
}
private:
void Validate( String^ filename, XmlSchemaCollection^ xsc )
{
m_success = true;
Console::WriteLine();
Console::WriteLine( "Validating XML file {0}...", filename );
reader = gcnew XmlTextReader( filename );
//Create a validating reader.
vreader = gcnew XmlValidatingReader( reader );
//Validate using the schemas stored in the schema collection.
vreader->Schemas->Add( xsc );
//Set the validation event handler
vreader->ValidationEventHandler += gcnew ValidationEventHandler( this, &SchemaCollectionSample::ValidationCallBack );
//Read and validate the XML data.
while ( vreader->Read() )
{}
Console::WriteLine( "Validation finished. Validation {0}", (m_success == true ? (String^)"successful" : "failed") );
Console::WriteLine();
//Close the reader.
vreader->Close();
}
void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ args )
{
m_success = false;
Console::Write( "\r\n\tValidation error: {0}", args->Message );
}
};
int main()
{
gcnew SchemaCollectionSample;
}
using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;
public class SchemaCollectionSample
{
private const String doc1 = "booksSchema.xml";
private const String doc2 = "booksSchemaFail.xml";
private const String doc3 = "newbooks.xml";
private const String schema = "books.xsd";
private const String schema1 = "schema1.xdr";
private XmlTextReader reader=null;
private XmlValidatingReader vreader = null;
private Boolean m_success = true;
public SchemaCollectionSample ()
{
//Load the schema collection.
XmlSchemaCollection xsc = new XmlSchemaCollection();
xsc.Add("urn:bookstore-schema", schema); //XSD schema
xsc.Add("urn:newbooks-schema", schema1); //XDR schema
//Validate the files using schemas stored in the collection.
Validate(doc1, xsc); //Should pass.
Validate(doc2, xsc); //Should fail.
Validate(doc3, xsc); //Should fail.
}
public static void Main ()
{
SchemaCollectionSample validation = new SchemaCollectionSample();
}
private void Validate(String filename, XmlSchemaCollection xsc)
{
m_success = true;
Console.WriteLine();
Console.WriteLine("Validating XML file {0}...", filename.ToString());
reader = new XmlTextReader (filename);
//Create a validating reader.
vreader = new XmlValidatingReader (reader);
//Validate using the schemas stored in the schema collection.
vreader.Schemas.Add(xsc);
//Set the validation event handler
vreader.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
//Read and validate the XML data.
while (vreader.Read()){}
Console.WriteLine ("Validation finished. Validation {0}", (m_success==true ? "successful" : "failed"));
Console.WriteLine();
//Close the reader.
vreader.Close();
}
private void ValidationCallBack (object sender, ValidationEventArgs args)
{
m_success = false;
Console.Write("\r\n\tValidation error: " + args.Message);
}
}
Option Strict
Option Explicit
Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Public Class SchemaCollectionSample
Private doc1 As String = "booksSchema.xml"
Private doc2 As String = "booksSchemaFail.xml"
Private doc3 As String = "newbooks.xml"
Private schema As String = "books.xsd"
Private schema1 As String = "schema1.xdr"
Private reader As XmlTextReader = Nothing
Private vreader As XmlValidatingReader = Nothing
Private m_success As Boolean = True
Public Sub New()
'Load the schema collection
Dim xsc As New XmlSchemaCollection()
xsc.Add("urn:bookstore-schema", schema) 'XSD schema
xsc.Add("urn:newbooks-schema", schema1) 'XDR schema
'Validate the files using schemas stored in the collection.
Validate(doc1, xsc) 'Should pass.
Validate(doc2, xsc) 'Should fail.
Validate(doc3, xsc) 'Should fail.
End Sub
Public Shared Sub Main()
Dim validation As New SchemaCollectionSample()
End Sub
Private Sub Validate(filename As String, xsc As XmlSchemaCollection)
m_success = True
Console.WriteLine()
Console.WriteLine("Validating XML file {0}...", filename.ToString())
reader = New XmlTextReader(filename)
'Create a validating reader.
vreader = New XmlValidatingReader(reader)
'Use the schemas stored in the schema collection.
vreader.Schemas.Add(xsc)
'Set the validation event handler.
AddHandler vreader.ValidationEventHandler, AddressOf ValidationCallBack
'Read and validate the XML data.
While vreader.Read()
End While
Console.WriteLine("Validation finished. Validation {0}", IIf(m_success, "successful", "failed"))
Console.WriteLine()
'Close the reader.
vreader.Close()
End Sub
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
En el ejemplo se usan los cinco archivos de entrada siguientes:
booksSchema.xml
<?xml version='1.0'?>
<bookstore xmlns="urn:bookstore-schema">
<book genre="autobiography">
<title>The Autobiography of Benjamin Franklin</title>
<author>
<first-name>Benjamin</first-name>
<last-name>Franklin</last-name>
</author>
<price>8.99</price>
</book>
<book genre="novel">
<title>The Confidence Man</title>
<author>
<first-name>Herman</first-name>
<last-name>Melville</last-name>
</author>
<price>11.99</price>
</book>
</bookstore>
booksSchemaFail.xml
<?xml version='1.0'?>
<bookstore xmlns="urn:bookstore-schema">
<book>
<author>
<first-name>Benjamin</first-name>
<last-name>Franklin</last-name>
</author>
</book>
<book genre="novel">
<title>The Confidence Man</title>
<author>
<first-name>Herman</first-name>
<last-name>Melville</last-name>
</author>
<price>11.99</price>
</book>
<book genre="philosophy">
<title>The Gorgias</title>
<author>
<name>Plato</name>
</author>
<price>9.99</price>
</book>
</bookstore>
newbooks.xml
<?xml version='1.0'?>
<bookstore xmlns="urn:newbooks-schema">
<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>
books.xsd
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="urn:bookstore-schema"
elementFormDefault="qualified"
targetNamespace="urn:bookstore-schema">
<xsd:element name="bookstore" type="bookstoreType"/>
<xsd:complexType name="bookstoreType">
<xsd:sequence maxOccurs="unbounded">
<xsd:element name="book" type="bookType"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="bookType">
<xsd:sequence>
<xsd:element name="title" type="xsd:string"/>
<xsd:element name="author" type="authorName"/>
<xsd:element name="price" type="xsd:decimal"/>
</xsd:sequence>
<xsd:attribute name="genre" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="authorName">
<xsd:sequence>
<xsd:element name="first-name" type="xsd:string"/>
<xsd:element name="last-name" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
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>
Comentarios
Nota
La XmlValidatingReader clase está obsoleta en .NET Framework 2.0. Puede crear una instancia de XmlReader validación mediante la XmlReaderSettings clase y el Create método . Para obtener más información, vea la sección Comentarios de la página de referencia de XmlReader.
XmlSchemaCollection
contiene XML-Data los esquemas de lenguaje de definición de esquemas XML (XDR) y reducidos (XDR) cargados previamente. Esta propiedad proporciona al lector acceso a la memoria caché de esquemas y le permite validar sin tener que volver a cargar esquemas cada vez. El lector no agrega nada a .XmlSchemaCollection
XmlSchemaCollection
Si incluye un esquema XML (XSD) que contiene include
o import
elementos que hacen referencia a otros espacios de nombres, los esquemas de estos otros espacios de nombres solo se cargan con fines de validación. A menos que estos esquemas se agreguen explícitamente a la colección de esquemas, no serán accesibles mediante ninguno de los métodos o propiedades de la colección. Por ejemplo, si la colección contiene el archivo a.xsd
de esquema , que contiene una referencia al archivo b.xsd
de esquema , debe agregar b.xsd
a la colección de esquemas para poder acceder a ella mediante cualquiera de los métodos o propiedades de la colección.
XmlSchemaCollection
Cuando se obtiene acceso a mediante la Schemas
propiedad , el XmlSchemaCollection.Add método usa el XmlResolver especificado por la XmlValidatingReader.XmlResolver propiedad .
Nota
Los esquemas se deben agregar a XmlSchemaCollection
antes de la primera Read
llamada.