Export (0) Print
Expand All

XmlReaderSettings.ValidationType Property

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

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

'Declaration
Public Property ValidationType As ValidationType

Property Value

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

The following table describes the ValidationType values.

NoteNote

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).

NoteNote

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.)

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

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

public class Sample 

  public shared 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 shared sub ValidationCallBack(sender as object, e as ValidationEventArgs) 
    Console.WriteLine("Validation Error: {0}", e.Message)
  end sub
end class

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>

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft