XmlReaderSettings.ValidationType XmlReaderSettings.ValidationType XmlReaderSettings.ValidationType XmlReaderSettings.ValidationType Property

定义

获取或设置一个值,该值指示 XmlReader 在读取时是否执行验证或类型分配。Gets or sets a value indicating whether the XmlReader will perform validation or type assignment when reading.

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 的一个值指示 XmlReader 是否将呈现有效或当读取的时执行验证或类型分配。One of the ValidationType values that indicates whether XmlReader will perform validation or type assignment when reading. 默认值为 ValidationType.NoneThe default is ValidationType.None.

示例

下面的示例使用中XmlSchemaSet存储的架构进行验证。The following example validates using a schema stored in the XmlSchemaSet.

#using <System.Xml.dll>

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

// Display any validation errors.
static void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ e )
{
   Console::WriteLine( L"Validation Error:\n   {0}", e->Message );
   Console::WriteLine();
}

int main()
{
   // Create the XmlSchemaSet class.
   XmlSchemaSet^ sc = gcnew XmlSchemaSet;

   // Add the schema to the collection.
   sc->Add( L"urn:bookstore-schema", L"books.xsd" );

   // Set the validation settings.
   XmlReaderSettings^ settings = gcnew XmlReaderSettings;
   settings->ValidationType = ValidationType::Schema;
   settings->Schemas = sc;
   settings->ValidationEventHandler += gcnew ValidationEventHandler(ValidationCallBack);

   // Create the XmlReader object.
   XmlReader^ reader = XmlReader::Create( L"booksSchemaFail.xml", settings );

   // Parse the file. 
   while ( reader->Read() )
      ;

   return 1;
}
// The example displays output like the following:
//   Validation Error: 
//        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
//        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
//        namespace 'urn:bookstore-schema'.
//
//    Validation Error: 
//       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
//       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
//       namespace 'urn:bookstore-schema'.
using System;
using System.Xml;
using System.Xml.Schema;
using System.IO;

public class Sample 
{
  public static void Main() {

    // Create the XmlSchemaSet class.
    XmlSchemaSet sc = new XmlSchemaSet();

    // Add the schema to the collection.
    sc.Add("urn:bookstore-schema", "books.xsd");

    // Set the validation settings.
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.ValidationType = ValidationType.Schema;
    settings.Schemas = sc;
    settings.ValidationEventHandler += ValidationCallBack;
 
    // Create the XmlReader object.
    XmlReader reader = XmlReader.Create("booksSchemaFail.xml", settings);

    // Parse the file. 
    while (reader.Read());
  }

  // Display any validation errors.
  private static void ValidationCallBack(object sender, ValidationEventArgs e) {
    Console.WriteLine($"Validation Error:\n   {e.Message}\n");
  }
}
// The example displays output like the following:
//   Validation Error: 
//        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
//        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
//        namespace 'urn:bookstore-schema'.
//
//    Validation Error: 
//       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
//       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
//       namespace 'urn:bookstore-schema'.
Imports System.Xml
Imports System.Xml.Schema
Imports System.IO

Public Module Sample 
  Public 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 Sub ValidationCallBack(sender as object, e as ValidationEventArgs) 
    Console.WriteLine($"Validation Error:{vbCrLf}   {e.Message}")
    Console.WriteLine()
  End Sub
End Module
' The example displays output like the following:
'   Validation Error: 
'        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
'        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
'        namespace 'urn:bookstore-schema'.
'
'    Validation Error: 
'       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
'       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
'       namespace 'urn:bookstore-schema'.

该示例使用以下输入文件: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>

注解

下表说明了这些ValidationType值。The following table describes the ValidationType values.

备注

AutoXDR枚举值在 .NET Framework 版本2.0 中已过时。The Auto and XDR enumeration values are obsolete in .NET Framework version 2.0.

ValidationTypeValidationType 说明Description
DTD 使用文档类型定义 (DTD) 执行验证。Validation is performed using a document type definition (DTD). 注意: 还必须将Parse DtdProcessing属性设置为。Note: The DtdProcessing property must also be set to Parse.
None XmlReader会验证数据, 也不会执行任何类型赋值。The XmlReader does not validate data, or perform any type assignment.
Schema 使用 XML 架构定义语言 (XSD) 架构执行验证和类型赋值。Validation and type assignment is performed using an XML Schema definition language (XSD) schema. 读者使用以下内容访问 XML 架构:The reader accesses the XML Schema using the following:

-使用Schemas属性访问与此读取XmlSchemaSet器关联的对象。- Uses the Schemas property to access the XmlSchemaSet object associated with this reader.
-使用 XML 实例文档中包含的内联架构。- Uses the in-line schema contained in the XML instance document. (必须ProcessInlineSchema启用此选项。)(The ProcessInlineSchema option must be enabled.)
-使用 xml 实例文档中的架构位置提示 (xsi:schemaLocationxsi:noNamespaceSchemaLocation特性) 指定的 xml 架构。- Uses the XML Schema specified by schema location hints (xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute) found in the XML instance document. (必须ProcessSchemaLocation启用此选项。)(The ProcessSchemaLocation option must be enabled.)

适用于

另请参阅