XmlValidatingReader.Schemas 属性

定义

获取一个用于验证的 XmlSchemaCollectionGets 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.XmlSchemaCollection
Public ReadOnly Property Schemas As XmlSchemaCollection

属性值

用于验证的 XmlSchemaCollectionThe XmlSchemaCollection to use for validation.

示例

下面的示例使用存储在 XmlSchemaCollection 中的架构验证三个 XML 文件。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

该示例使用以下五个输入文件: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>

注解

备注

XmlValidatingReader 类在 .NET Framework 2.0.NET Framework 2.0中已过时。The XmlValidatingReader class is obsolete in .NET Framework 2.0.NET Framework 2.0. 您可以通过使用 XmlReaderSettings 类和 Create 方法来创建验证 XmlReader 实例。You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. 有关详细信息,请参阅 XmlReader 引用页的“备注”部分。For more information, see the Remarks section of the XmlReader reference page.

XmlSchemaCollection 保存预先加载的 XML 数据缩减(XDR)架构和 XML 架构定义语言(XSD)架构。The XmlSchemaCollection holds pre-loaded XML-Data Reduced (XDR) and XML Schema definition language (XSD) schemas. 此属性可让读取器访问架构的缓存,并允许其验证,而无需每次重新加载架构。This property gives the reader access to the cache of schemas and allows it to validate without having to re-load schemas every time. 读取器不会将任何内容添加到 XmlSchemaCollectionThe reader does not add anything to the XmlSchemaCollection.

如果 XmlSchemaCollection 包含的 XML 架构(XSD)包含引用其他命名空间的 includeimport 元素,则出于验证目的,将加载这些其他命名空间的架构。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. 除非已将这些架构显式添加到架构集合,否则将无法使用任何集合方法或属性访问它们。Unless these schemas were explicitly added to the schema collection, they will not be accessible using any of the collection methods or properties. 例如,如果集合包含架构文件 a.xsd(其中包含对架构文件 b.xsd的引用),则必须将 b.xsd 添加到架构集合,然后才能使用任何集合方法或属性对其进行访问。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.

使用 Schemas 属性访问 XmlSchemaCollection 时,XmlSchemaCollection.Add 方法使用由 XmlValidatingReader.XmlResolver 属性指定的 XmlResolverWhen the XmlSchemaCollection is accessed using the Schemas property, the XmlSchemaCollection.Add method uses the XmlResolver specified by the XmlValidatingReader.XmlResolver property.

备注

在第一次 Read 调用之前,必须将架构添加到 XmlSchemaCollectionThe schemas must be added to the XmlSchemaCollection before the first Read call.

适用于

另请参阅