XmlValidatingReader.SchemaType 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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获取架构类型对象。

public:
 property System::Object ^ SchemaType { System::Object ^ get(); };

public object? SchemaType { get; }

public object SchemaType { get; }

member this.SchemaType : obj

Public ReadOnly Property SchemaType As Object

属性值

Object

XmlSchemaDatatype、XmlSchemaSimpleType 或 XmlSchemaComplexType，这取决于节点值是内置 XML 架构定义语言 (XSD) 类型还是用户定义的 simpleType 或 complexType；如果当前节点没有架构类型，则为 null。

示例

以下示例显示 XML 文档中每个元素的类型信息。

#using <System.Xml.dll>
#using <System.dll>

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

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

public:
   static void main()
   {
      XmlTextReader^ tr = gcnew XmlTextReader( "booksSchema.xml" );
      XmlValidatingReader^ vr = gcnew XmlValidatingReader( tr );
      vr->Schemas->Add( nullptr, "books.xsd" );
      vr->ValidationType = ValidationType::Schema;
      vr->ValidationEventHandler += gcnew ValidationEventHandler( Sample::ValidationCallBack );
      while ( vr->Read() )
      {
         if ( vr->NodeType == XmlNodeType::Element )
         {
            if ( dynamic_cast<XmlSchemaComplexType^>(vr->SchemaType) != nullptr )
            {
               XmlSchemaComplexType^ sct = dynamic_cast<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 );
            }
         }
      }
   }
};

int main()
{
   Sample::main();
}

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);
  }
}

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

public class Sample

  public shared sub Main()
  
  Dim tr as XmlTextReader = new XmlTextReader("booksSchema.xml")
  Dim vr as XmlValidatingReader = new XmlValidatingReader(tr)
 
  vr.Schemas.Add(nothing, "books.xsd")
  vr.ValidationType = ValidationType.Schema
  AddHandler vr.ValidationEventHandler, AddressOf ValidationCallBack

  while(vr.Read())

    if(vr.NodeType = XmlNodeType.Element)
    
      if (vr.SchemaType.ToString() = "System.Xml.Schema.XmlSchemaComplexType")
        Dim sct as XmlSchemaComplexType = CType(vr.SchemaType,XmlSchemaComplexType)
        Console.WriteLine("{0}({1})", vr.Name, sct.Name)
      else      
        Dim value as object = vr.ReadTypedValue()
        Console.WriteLine("{0}({1}):{2}", vr.Name, value.GetType().Name, value)    
      end if
    end if
  end while
  end sub

  private shared sub ValidationCallBack (sender as object, args as ValidationEventArgs)

   Console.WriteLine("***Validation error")
   Console.WriteLine("Severity:{0}", args.Severity)
   Console.WriteLine("Message  :{0}", args.Message)
  end sub
end class

此示例使用以下输入文件。

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>

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。

用户需要测试返回的类型。例如，

object obj = vreader.SchemaType;  
 if (obj is XmlSchemaType)  
 {  
   XmlSchemaType st = (XmlSchemaType)obj;  
   // use XmlSchemaType object  
 }  
 if (obj is XmlSchemaDatatype)  
 {  
   XmlSchemaDatatype sd = (XmlSchemaDatatype)obj;  
   Type vt = sd.ValueType;  
   // use XmlSchemaDatatype object  
       }

如果要执行 XML 架构验证，或XmlSchemaType``XmlSchemaDatatype对应于正在读取的当前元素。如果执行文档类型定义 (DTD 验证) ，则此属性返回 null。

XmlSchemaDatatype 如果当前元素或属性是一种简单类型，可以指定简单类型的特殊验证约束，例如 min 和 max。

XmlSchemaSimpleType 如果当前元素或属性是用户定义的 simpleType，则返回。

XmlSchemaComplexType 如果当前元素是用户定义的 complexType，则返回。此属性无法返回此类型。

备注

如果 ValidationType 已设置为 ValidationType.None，则不会从架构或 DTD 中提供任何数据类型信息。

注意

调用 Close后，SchemaType 将返回 Null。

适用于

另请参阅

XmlReader

通过

XmlValidatingReader.SchemaType 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源