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XmlReaderSettings.ValidationType Property

  • Reference

Definition

Namespace:
System.Xml
Assembly:
System.Xml.ReaderWriter.dll
Assembly:
System.Xml.dll
Assembly:
netstandard.dll
Source:
XmlReaderSettings.cs
Source:
XmlReaderSettings.cs
Source:
XmlReaderSettings.cs

Gets or sets a value indicating whether the XmlReader will perform validation or type assignment when reading.

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, set
Public Property ValidationType As ValidationType

Property Value

ValidationType

One of the ValidationType values that indicates whether XmlReader will perform validation or type assignment when reading. The default is ValidationType.None.

Examples

The following example validates using a schema stored in the XmlSchemaSet.

#using <System.Xml.dll>

using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
using namespace System::IO;

// Display any validation errors.
static void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ e )
{
   Console::WriteLine( L"Validation Error:\n   {0}", e->Message );
   Console::WriteLine();
}

int main()
{
   // Create the XmlSchemaSet class.
   XmlSchemaSet^ sc = gcnew XmlSchemaSet;

   // Add the schema to the collection.
   sc->Add( L"urn:bookstore-schema", L"books.xsd" );

   // Set the validation settings.
   XmlReaderSettings^ settings = gcnew XmlReaderSettings;
   settings->ValidationType = ValidationType::Schema;
   settings->Schemas = sc;
   settings->ValidationEventHandler += gcnew ValidationEventHandler(ValidationCallBack);

   // Create the XmlReader object.
   XmlReader^ reader = XmlReader::Create( L"booksSchemaFail.xml", settings );

   // Parse the file. 
   while ( reader->Read() )
      ;

   return 1;
}
// The example displays output like the following:
//   Validation Error: 
//        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
//        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
//        namespace 'urn:bookstore-schema'.
//
//    Validation Error: 
//       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
//       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
//       namespace 'urn:bookstore-schema'.

using System;
using System.Xml;
using System.Xml.Schema;
using System.IO;

public class Sample
{
  public static void Main() {

    // Create the XmlSchemaSet class.
    XmlSchemaSet sc = new XmlSchemaSet();

    // Add the schema to the collection.
    sc.Add("urn:bookstore-schema", "books.xsd");

    // Set the validation settings.
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.ValidationType = ValidationType.Schema;
    settings.Schemas = sc;
    settings.ValidationEventHandler += ValidationCallBack;

    // Create the XmlReader object.
    XmlReader reader = XmlReader.Create("booksSchemaFail.xml", settings);

    // Parse the file.
    while (reader.Read());
  }

  // Display any validation errors.
  private static void ValidationCallBack(object sender, ValidationEventArgs e) {
    Console.WriteLine($"Validation Error:\n   {e.Message}\n");
  }
}
// The example displays output like the following:
//   Validation Error:
//        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author'
//        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in
//        namespace 'urn:bookstore-schema'.
//
//    Validation Error:
//       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name'
//       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in
//       namespace 'urn:bookstore-schema'.

Imports System.Xml
Imports System.Xml.Schema
Imports System.IO

Public Module Sample 
  Public Sub Main() 

    ' Create the XmlSchemaSet class.
    Dim sc as XmlSchemaSet = new XmlSchemaSet()

    ' Add the schema to the collection.
    sc.Add("urn:bookstore-schema", "books.xsd")

    ' Set the validation settings.
    Dim settings as XmlReaderSettings = new XmlReaderSettings()
    settings.ValidationType = ValidationType.Schema
    settings.Schemas = sc
    AddHandler settings.ValidationEventHandler, AddressOf ValidationCallBack
 
    ' Create the XmlReader object.
    Dim reader as XmlReader = XmlReader.Create("booksSchemaFail.xml", settings)

    ' Parse the file. 
    While reader.Read()
    End While
    
  End Sub

  ' Display any validation errors.
  Private Sub ValidationCallBack(sender as object, e as ValidationEventArgs) 
    Console.WriteLine($"Validation Error:{vbCrLf}   {e.Message}")
    Console.WriteLine()
  End Sub
End Module
' The example displays output like the following:
'   Validation Error: 
'        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
'        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
'        namespace 'urn:bookstore-schema'.
'
'    Validation Error: 
'       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
'       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
'       namespace 'urn:bookstore-schema'.

The sample uses the following input files:

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>

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>

Remarks

The following table describes the ValidationType values.

Note

The Auto and XDR enumeration values are obsolete in .NET Framework version 2.0.

ValidationType Description
DTD Validation is performed using a document type definition (DTD). Note: The DtdProcessing property must also be set to Parse.
None The XmlReader does not validate data, or perform any type assignment.
Schema Validation and type assignment is performed using an XML Schema definition language (XSD) schema. The reader accesses the XML Schema using the following:

- Uses the Schemas property to access the XmlSchemaSet object associated with this reader.
- Uses the in-line schema contained in the XML instance document. (The ProcessInlineSchema option must be enabled.)
- Uses the XML Schema specified by schema location hints (xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute) found in the XML instance document. (The ProcessSchemaLocation option must be enabled.)

Applies to

See also