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XmlTextReader Constructor (String, XmlNodeType, XmlParserContext)

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.

ExceptionCondition
XmlException

fragType is not an Element, Attribute, or Document XmlNodeType.

ArgumentNullException

xmlFragment is null.

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;
using System.IO;
using System.Xml;

public class Sample 
{
  public static void 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 = new NameTable();
    XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
    nsmgr.AddNamespace("bk", "urn:sample");

    //Create the XmlParserContext.
    XmlParserContext context = new XmlParserContext(null, nsmgr, null, XmlSpace.None);

    //Create the reader. 
    XmlTextReader reader = new 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 " + reader.NamespaceURI);
        }
      }
    }

    //Close the reader.
    reader.Close();     

  }
} // End class

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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