XmlValidatingReader.Schemas Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets a XmlSchemaCollection to use for validation.
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.XmlSchemaCollectionPublic ReadOnly Property Schemas As XmlSchemaCollectionProperty Value
The XmlSchemaCollection to use for validation.
Examples
The following example validates three XML files using schemas stored in the 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
The sample uses the following five input files:
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>
Remarks
Note
The XmlValidatingReader class is obsolete in .NET Framework 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see the Remarks section of the XmlReader reference page.
The XmlSchemaCollection holds pre-loaded XML-Data Reduced (XDR) and XML Schema definition language (XSD) schemas. This property gives the reader access to the cache of schemas and allows it to validate without having to re-load schemas every time. The reader does not add anything to the XmlSchemaCollection.
If the XmlSchemaCollection includes an XML schema (XSD) which contains include or import elements that reference other namespaces, the schemas for these other namespaces are loaded for validation purposes only. Unless these schemas were explicitly added to the schema collection, they will not be accessible using any of the collection methods or properties. For example, if the collection contains the schema file a.xsd, which contains a reference to the schema file b.xsd, you must add b.xsd to the schema collection before you can access it using any of the collection methods or properties.
When the XmlSchemaCollection is accessed using the Schemas property, the XmlSchemaCollection.Add method uses the XmlResolver specified by the XmlValidatingReader.XmlResolver property.
Note
The schemas must be added to the XmlSchemaCollection before the first Read call.
Applies to
See also
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