XmlValidatingReader.ValidationType 属性

参考

定义

命名空间:: System.Xml

程序集:: System.Xml.ReaderWriter.dll

程序集:: System.Xml.dll

程序集:: netstandard.dll

重要

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获取或设置一个值，该值指示要执行的验证的类型。

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

属性值

ValidationType

ValidationType 值之一。如果未设置此属性，则它默认为 ValidationType.Auto。

例外

InvalidOperationException

在调用了 Read 之后设置该属性。

示例

以下示例验证两个文件。

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Schema;
public ref class Sample
{
private:
   XmlTextReader^ txtreader;
   XmlValidatingReader^ reader;
   Boolean m_success;

public:
   Sample()
   {
      txtreader = nullptr;
      reader = nullptr;
      m_success = true;
      String^ doc1 = "notValid.xml";
      String^ doc2 = "cdDTD.xml";
      String^ doc3 = "book1.xml";
      
      //Parse the files and validate when requested.
      Validate( doc1, ValidationType::XDR ); //Validation should fail.
      Validate( doc2, ValidationType::DTD ); //Validation should fail.
      Validate( doc3, ValidationType::None ); //No validation performed.
   }


private:
   void Validate( String^ filename, ValidationType vt )
   {
      try
      {
         
         //Implement the readers.  Set the ValidationType.
         txtreader = gcnew XmlTextReader( filename );
         reader = gcnew XmlValidatingReader( txtreader );
         reader->ValidationType = vt;
         
         //If the reader is set to validate, set the event handler.
         if ( vt == ValidationType::None )
                  Console::WriteLine( "\nParsing XML file {0}", filename );
         else
         {
            Console::WriteLine( "\nValidating XML file {0}", filename );
            m_success = true;
            
            //Set the validation event handler.
            reader->ValidationEventHandler += gcnew ValidationEventHandler( this, &Sample::ValidationCallBack );
         }
         
         // Read XML data
         while ( reader->Read() )
         {}
         if ( vt == ValidationType::None )
                  Console::WriteLine( "Finished parsing file." );
         else
                  Console::WriteLine( "Validation finished. Validation {0}", m_success ? (String^)"successful" : "failed" );
      }
      finally
      {
         
         //Close the reader.
         if ( reader != nullptr )
                  reader->Close();
      }

   }


   //Display the validation errors.
   void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ args )
   {
      m_success = false;
      Console::Write( "\r\n\tValidation error: {0}", args->Message );
   }

};

int main()
{
   gcnew Sample;
}

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

public class Sample
{
  private const String doc1 = "notValid.xml";
  private const String doc2 = "cdDTD.xml";
  private const String doc3 = "book1.xml";

  private XmlTextReader txtreader = null;
  private XmlValidatingReader reader = null;
  private Boolean m_success = true;

  public Sample ()
  {
      //Parse the files and validate when requested.
      Validate(doc1, ValidationType.XDR);  //Validation should fail.
      Validate(doc2, ValidationType.DTD);  //Validation should fail.
      Validate(doc3, ValidationType.None); //No validation performed.
  }

  public static void Main ()
  {
      Sample validation = new Sample();
  }

  private void Validate(String filename, ValidationType vt)
  {
    try
    {
        //Implement the readers.  Set the ValidationType.
        txtreader = new XmlTextReader(filename);
        reader = new XmlValidatingReader(txtreader);
        reader.ValidationType = vt;

        //If the reader is set to validate, set the event handler.
        if (vt==ValidationType.None)
            {
                Console.WriteLine("\nParsing XML file " + filename.ToString());
            }
            else
            {
           Console.WriteLine("\nValidating XML file " + filename.ToString());
           m_success = true;
           //Set the validation event handler.
           reader.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
        }

        // Read XML data
        while (reader.Read()){}

        if (vt==ValidationType.None)
           Console.WriteLine("Finished parsing file.");
        else
          Console.WriteLine ("Validation finished. Validation {0}", (m_success==true ? "successful" : "failed"));
     }

     finally
     {
        //Close the reader.
        if (reader != null)
          reader.Close();
     }
  }

  //Display the validation errors.
  private void ValidationCallBack (object sender, ValidationEventArgs args)
  {
     m_success = false;

     Console.Write("\r\n\tValidation error: " + args.Message);
  }
}

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

Public Class Sample
    Private doc1 As String = "notValid.xml"
    Private doc2 As String = "cdDTD.xml"
    Private doc3 As String = "book1.xml"
    
    Private txtreader As XmlTextReader = Nothing
    Private reader As XmlValidatingReader = Nothing
    Private m_success As Boolean = True
    
    Public Sub New()
        'Parse the files and validate when requested.
        Validate(doc1, ValidationType.XDR) 'Validation should fail.
        Validate(doc2, ValidationType.DTD) 'Validation should fail.
        Validate(doc3, ValidationType.None) 'No validation performed.
    End Sub
    
    Public Shared Sub Main()
        Dim validation As New Sample()
    End Sub
    
    Private Sub Validate(filename As String, vt As ValidationType)
        Try
            'Implement the readers.  Set the ValidationType.
            txtreader = New XmlTextReader(filename)
            reader = New XmlValidatingReader(txtreader)
            reader.ValidationType = vt
            
            'If the reader is set to validate, set the event handler.
            If vt = ValidationType.None Then
                Console.WriteLine(ControlChars.Cr & "Parsing XML file " & filename.ToString())
            Else
                Console.WriteLine(ControlChars.Cr & "Validating XML file " & filename.ToString())
                m_success = True
                'Set the validation event handler.
                AddHandler reader.ValidationEventHandler, AddressOf ValidationCallBack
            End If
            
            ' Read XML data
            While reader.Read()
            End While 
            If vt = ValidationType.None Then
                Console.WriteLine("Finished parsing file.")
            Else
                Console.WriteLine("Validation finished. Validation {0}", IIf(m_success, "successful", "failed"))
            End If
        
        Finally
            'Close the reader.
            If Not (reader Is Nothing) Then
                reader.Close()
            End If
        End Try 
    End Sub
    
    'Display the validation errors.
    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

此示例使用以下四个输入文件：

notValid.xml (“x-schema：”前缀标识读取器 (XDR) 架构的XML-Data减少)


<?xml version='1.0'?>
<bookstore xmlns="x-schema:schema1.xdr">
  <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>

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>

cdDTD.xml


<!--XML file using a DTD-->
<!DOCTYPE bookstore [
  <!ELEMENT bookstore (cd)*> 
  <!ELEMENT cd (title,artist,price)>
  <!ATTLIST cd genre CDATA #REQUIRED>
  <!ELEMENT title (#PCDATA)>
  <!ELEMENT artist (#PCDATA)>
  <!ELEMENT price (#PCDATA)>]>
<bookstore>
  <cd genre="alternative"  ISBN="2-3631-4">
    <title>Americana</title>
    <artist>Offspring</artist>
    <price>16.95</price>
  </cd>
</bookstore>

book1.xml


<?xml version='1.0' ?>
<!DOCTYPE book [<!ENTITY h 'hardcover'>]>
<book>
  <title>Pride And Prejudice</title>
  <misc>&h;</misc>
</book>

注解

备注

类XmlValidatingReader在 .NET Framework 2.0 中已过时。可以使用类和Create方法创建验证XmlReader实例XmlReaderSettings。有关详细信息，请参阅 XmlReader 引用页的“备注”部分。

必须在第一次调用 Read之前设置此属性。将此属性设置为 ValidationType.None 将创建一个非验证读取器。

如果使用外部文档类型定义 (DTD) 或架构进行验证， XmlResolver 则使用。

适用于

另请参阅

XmlReader

通过

XmlValidatingReader.ValidationType 属性

定义

属性值

例外

示例

注解

适用于

另请参阅

其他资源