XmlTextReader Constructor (String^, XmlNodeType, XmlParserContext^)

 
System_CAPS_noteNote

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Initializes a new instance of the XmlTextReader class with the specified string, XmlNodeType, and XmlParserContext.

Namespace:   System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public:
XmlTextReader(
	String^ xmlFragment,
	XmlNodeType fragType,
	XmlParserContext^ context
)

Parameters

xmlFragment
Type: System::String^

The string containing the XML fragment to parse.

fragType
Type: System.Xml::XmlNodeType

The XmlNodeType of the XML fragment. This also determines what the fragment string can contain. (See table below.)

context
Type: System.Xml::XmlParserContext^

The XmlParserContext in which the xmlFragment is to be parsed. This includes the XmlNameTable to use, encoding, namespace scope, the current xml:lang, and the xml:space scope.

Exception Condition
XmlException

fragType is not an Element, Attribute, or DocumentXmlNodeType.

ArgumentNullException

xmlFragment is null.

System_CAPS_noteNote

Starting with the .NET Framework 2.0, we recommend that you create XmlReader instances by using the XmlReader::Create method to take advantage of new functionality.

This constructor parses the given string as a fragment of XML. If the XML fragment is an element or attribute, you can bypass the root level rules for well-formed XML documents. This constructor can handle strings returned from ReadInnerXml.

The following table lists valid values for fragType and how the reader parses each of the different node types.

XmlNodeType

Fragment May Contain

Element

Any valid element content (for example, any combination of elements, comments, processing instructions, CDATA sections, text, and entity references).

An XML declaration can also be supplied. This allows you to specify the encoding for the XML fragment, rather than having to set it on the XmlParserContext object.

Attribute

The value of an attribute (the part inside the quotes).

Document

The contents of an entire XML document. This enforces document level rules.

The following example parses an XML fragment. It uses the XmlParserContext and its XmlNamespaceManager to handle namespace resolution.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{

   // Create the XML fragment to be parsed.
   String^ xmlFrag = "<book> <title>Pride And Prejudice</title> <bk:genre>novel</bk:genre> </book>";

   // Create the XmlNamespaceManager.
   NameTable^ nt = gcnew NameTable;
   XmlNamespaceManager^ nsmgr = gcnew XmlNamespaceManager( nt );
   nsmgr->AddNamespace( "bk", "urn:sample" );

   // Create the XmlParserContext.
   XmlParserContext^ context = gcnew XmlParserContext( nullptr,nsmgr,nullptr,XmlSpace::None );

   // Create the reader. 
   XmlTextReader^ reader = gcnew XmlTextReader( xmlFrag,XmlNodeType::Element,context );

   // Parse the XML.  If they exist, display the prefix and  
   // namespace URI of each element.
   while ( reader->Read() )
   {
      if ( reader->IsStartElement() )
      {
         if ( reader->Prefix == String::Empty )
                  Console::WriteLine( "< {0}>", reader->LocalName );
         else
         {
            Console::Write( "< {0}: {1}>", reader->Prefix, reader->LocalName );
            Console::WriteLine( " The namespace URI is {0}", reader->NamespaceURI );
         }
      }
   }


   // Close the reader.
   reader->Close();
}

.NET Framework
Available since 1.1
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