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XmlValidatingReader.ReadTypedValue Method

Gets the common language runtime type for the specified XML Schema definition language (XSD) type.

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

public Object ReadTypedValue()

Return Value

Type: System.Object
The common language runtime type for the specified XML Schema type.

NoteNote:

The XmlValidatingReader class is obsolete in .NET Framework version 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see Validating XML Data with XmlReader.

For example, if the schema type is defined as xsd:int, the runtime type int32 is returned for the object. This can be tested using the GetType method and cast accordingly. The ReadTypedValue method always returns a type that is derived from the Object class. It never returns the Object type.

If the reader is positioned on an attribute, this method returns the runtime typed object, but does not change the position of the reader. If the reader is positioned on an element, ReadTypedValue reads any CDATA, text, white space, significant white space, and comment nodes, returns the runtime typed object and positions the reader on the end tag. Any types that do not have a direct mapping, for example NMTOKENS, are returned as strings.

NoteNote:

If ValidationType has been set to ValidationType.None, data type information is not provided from either schemas or document type definitions (DTDs).

Caution noteCaution:

After calling Close, ReadTypedValue will return null.

The following example displays the type information for each of the elements in the XML document.

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

public class Sample{

  public static void Main(){

  XmlTextReader tr = new XmlTextReader("booksSchema.xml");
  XmlValidatingReader vr = new XmlValidatingReader(tr);

  vr.Schemas.Add(null, "books.xsd");
  vr.ValidationType = ValidationType.Schema;
  vr.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);

  while(vr.Read()){
    if(vr.NodeType == XmlNodeType.Element){
      if(vr.SchemaType is XmlSchemaComplexType){
        XmlSchemaComplexType sct = (XmlSchemaComplexType)vr.SchemaType;
        Console.WriteLine("{0}({1})", vr.Name, sct.Name);
      }
      else{
        object value = vr.ReadTypedValue();
        Console.WriteLine("{0}({1}):{2}", vr.Name, value.GetType().Name, value);
      }
    }
  }
 }

  private static void ValidationCallBack (object sender, ValidationEventArgs args){
    Console.WriteLine("***Validation error");
    Console.WriteLine("\tSeverity:{0}", args.Severity);
    Console.WriteLine("\tMessage  :{0}", args.Message);
  }
}
#using <mscorlib.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Schema;

__gc public class Sample
{
public:
   static void ValidationCallBack (Object* sender, ValidationEventArgs * args)
   {
      Console::WriteLine(S"***Validation error");
      Console::WriteLine(S"\tSeverity: {0}", __box(args -> Severity));
      Console::WriteLine(S"\tMessage  : {0}", args -> Message);
   }
};

int main()
{
   XmlTextReader* tr = new XmlTextReader(S"booksSchema.xml");
   XmlValidatingReader* vr = new XmlValidatingReader(tr);

   vr -> Schemas->Add(0, S"books.xsd");
   vr -> ValidationType = ValidationType::Schema;
   vr -> ValidationEventHandler += new ValidationEventHandler (vr, Sample::ValidationCallBack);

   while (vr -> Read())
   {
      if (vr -> NodeType == XmlNodeType::Element) 
      {
         if (dynamic_cast<XmlSchemaComplexType*>(vr -> SchemaType) != 0)
         {
            XmlSchemaComplexType* sct = dynamic_cast<XmlSchemaComplexType*>( vr -> SchemaType );
            Console::WriteLine(S" {0}( {1})", vr -> Name, sct -> Name);
         } 
         else
         {
            Object* value = vr -> ReadTypedValue();
            Console::WriteLine(S" {0}( {1}): {2}", vr -> Name, value->GetType()->Name, value);
         }
      }
   }
}

The example uses the following 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>

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>

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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