XmlTextWriter.WriteProcessingInstruction Method
Writes out a processing instruction with a space between the name and text as follows: <?name text?>.
Assembly: System.Xml (in System.Xml.dll)
Parameters
- name
- Type: System.String
Name of the processing instruction.
- text
- Type: System.String
Text to include in the processing instruction.
| Exception | Condition |
|---|---|
| ArgumentException |
The text would result in a non-well formed XML document. name is either null or String.Empty. This method is being used to create an XML declaration after WriteStartDocument has already been called. |
Note
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In the .NET Framework version 2.0 release, the recommended practice is to create XmlWriter instances using the XmlWriter.Create method and the XmlWriterSettings class. This allows you to take full advantage of all the new features introduced in this release. For more information, see Creating XML Writers. |
If text is either null or String.Empty, this method writes a ProcessingInstruction with no data content, for example <?name?>.
The following example writes an XML file representing a book.
using System; using System.IO; using System.Xml; public class Sample { private const string filename = "sampledata.xml"; public static void Main() { XmlTextWriter writer = null; writer = new XmlTextWriter (filename, null); //Use indenting for readability. writer.Formatting = Formatting.Indented; //Write the XML delcaration. writer.WriteStartDocument(); //Write the ProcessingInstruction node. String PItext="type='text/xsl' href='book.xsl'"; writer.WriteProcessingInstruction("xml-stylesheet", PItext); //Write the DocumentType node. writer.WriteDocType("book", null , null, "<!ENTITY h 'hardcover'>"); //Write a Comment node. writer.WriteComment("sample XML"); //Write a root element. writer.WriteStartElement("book"); //Write the genre attribute. writer.WriteAttributeString("genre", "novel"); //Write the ISBN attribute. writer.WriteAttributeString("ISBN", "1-8630-014"); //Write the title. writer.WriteElementString("title", "The Handmaid's Tale"); //Write the style element. writer.WriteStartElement("style"); writer.WriteEntityRef("h"); writer.WriteEndElement(); //Write the price. writer.WriteElementString("price", "19.95"); //Write CDATA. writer.WriteCData("Prices 15% off!!"); //Write the close tag for the root element. writer.WriteEndElement(); writer.WriteEndDocument(); //Write the XML to file and close the writer. writer.Flush(); writer.Close(); //Load the file into an XmlDocument to ensure well formed XML. XmlDocument doc = new XmlDocument(); //Preserve white space for readability. doc.PreserveWhitespace = true; //Load the file. doc.Load(filename); //Display the XML content to the console. Console.Write(doc.InnerXml); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
