XmlReaderSettings.Schemas Property

Definition

Namespace:

System.Xml

Assembly:

System.Xml.ReaderWriter.dll

Source:

XmlReaderSettings.cs

Gets or sets the XmlSchemaSet to use when performing schema validation.

public:
 property System::Xml::Schema::XmlSchemaSet ^ Schemas { System::Xml::Schema::XmlSchemaSet ^ get(); void set(System::Xml::Schema::XmlSchemaSet ^ value); };

public System.Xml.Schema.XmlSchemaSet Schemas { get; set; }

member this.Schemas : System.Xml.Schema.XmlSchemaSet with get, set

Public Property Schemas As XmlSchemaSet

Property Value

XmlSchemaSet

The XmlSchemaSet to use when performing schema validation. The default is an empty XmlSchemaSet object.

Examples

The example below uses the XmlReaderSettings object and the XmlReader.Create method to associate a schema with an XML document. The schema is added to the Schemas property of the XmlReaderSettings object. The value of the Schemas property is an XmlSchemaSet object. The schema is used to validate that the XML document conforms to the schema content model. Schema validation errors and warnings are handled by the ValidationEventHandler defined in the XmlReaderSettings object.

#using <System.Xml.dll>

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

static void booksSettingsValidationEventHandler( Object^ /*sender*/, ValidationEventArgs^ e )
{
   if ( e->Severity == XmlSeverityType::Warning )
   {
      Console::Write( L"WARNING: " );
      Console::WriteLine( e->Message );
   }
   else
   if ( e->Severity == XmlSeverityType::Error )
   {
      Console::Write( L"ERROR: " );
      Console::WriteLine( e->Message );
   }
}

int main()
{
   XmlReaderSettings^ booksSettings = gcnew XmlReaderSettings;
   booksSettings->Schemas->Add( L"http://www.contoso.com/books", L"books.xsd" );
   booksSettings->ValidationType = ValidationType::Schema;
   booksSettings->ValidationEventHandler += gcnew ValidationEventHandler( booksSettingsValidationEventHandler );
   XmlReader^ books = XmlReader::Create( L"books.xml", booksSettings );
   while ( books->Read() )
   {}

   return 0;
}

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

class XmlSchemaSetExample
{
    static void Main()
    {
        XmlReaderSettings booksSettings = new XmlReaderSettings();
        booksSettings.Schemas.Add("http://www.contoso.com/books", "books.xsd");
        booksSettings.ValidationType = ValidationType.Schema;
        booksSettings.ValidationEventHandler += new ValidationEventHandler(booksSettingsValidationEventHandler);

        XmlReader books = XmlReader.Create("books.xml", booksSettings);

        while (books.Read()) { }
    }

    static void booksSettingsValidationEventHandler(object sender, ValidationEventArgs e)
    {
        if (e.Severity == XmlSeverityType.Warning)
        {
            Console.Write("WARNING: ");
            Console.WriteLine(e.Message);
        }
        else if (e.Severity == XmlSeverityType.Error)
        {
            Console.Write("ERROR: ");
            Console.WriteLine(e.Message);
        }
    }
}

Imports System.Xml
Imports System.Xml.Schema

Class XmlSchemaSetExample

    Shared Sub Main()

        Dim booksSettings As XmlReaderSettings = New XmlReaderSettings()
        booksSettings.Schemas.Add("http://www.contoso.com/books", "books.xsd")
        booksSettings.ValidationType = ValidationType.Schema
        AddHandler booksSettings.ValidationEventHandler, New ValidationEventHandler(AddressOf booksSettingsValidationEventHandler)

        Dim books As XmlReader = XmlReader.Create("books.xml", booksSettings)

        While books.Read()

        End While

    End Sub

    Shared Sub booksSettingsValidationEventHandler(ByVal sender As Object, ByVal e As ValidationEventArgs)

        If e.Severity = XmlSeverityType.Warning Then
            Console.Write("WARNING: ")
            Console.WriteLine(e.Message)

        ElseIf e.Severity = XmlSeverityType.Error Then
            Console.Write("ERROR: ")
            Console.WriteLine(e.Message)
        End If

    End Sub

End Class

The example uses the books.xml file as input.

<bookstore xmlns="http://www.contoso.com/books">
  <book genre="autobiography" publicationdate="1981" ISBN="1-861003-11-0">
    <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" publicationdate="1967" ISBN="0-201-63361-2">
    <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" publicationdate="1991" ISBN="1-861001-57-6">
    <title>The Gorgias</title>
    <author>
      <name>Plato</name>
    </author>
    <price>9.99</price>
  </book>
</bookstore>

The example uses the books.xsd file as an input.

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.contoso.com/books" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="bookstore">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" name="book">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="title" type="xs:string" />
                            <xs:element name="author">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element minOccurs="0" name="name" type="xs:string" />
                                        <xs:element minOccurs="0" name="first-name" type="xs:string" />
                                        <xs:element minOccurs="0" name="last-name" type="xs:string" />
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                            <xs:element name="price" type="xs:decimal" />
                        </xs:sequence>
                        <xs:attribute name="genre" type="xs:string" use="required" />
                        <xs:attribute name="publicationdate" type="xs:unsignedShort" use="required" />
                        <xs:attribute name="ISBN" type="xs:string" use="required" />
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Remarks

For more information about this API, see Supplemental API remarks for XmlReaderSettings.Schemas.

See also

• XmlReader
• Create(String)