XmlWriter.WriteDocType Method
When overridden in a derived class, writes the DOCTYPE declaration with the specified name and optional attributes.
Assembly: System.Xml (in System.Xml.dll)
public abstract void WriteDocType( string name, string pubid, string sysid, string subset )
Parameters
- name
- Type: System.String
The name of the DOCTYPE. This must be non-empty.
- pubid
- Type: System.String
If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.
- sysid
- Type: System.String
If pubid is null and sysid is non-null it writes SYSTEM "sysid" where sysid is replaced with the value of this argument.
- subset
- Type: System.String
If non-null it writes [subset] where subset is replaced with the value of this argument.
| Exception | Condition |
|---|---|
| InvalidOperationException |
This method was called outside the prolog (after the root element). |
| ArgumentException |
The value for name would result in invalid XML. |
This method does not check for invalid characters in pubid, sysid or subset. It also does not check that the internal subset is well-formed.
Security Note
|
|---|
|
The XmlWriter does not validate the data that is passed to the WriteDocType method. You should not pass arbitrary data to this method. |
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() { XmlWriterSettings settings = new XmlWriterSettings(); settings.Indent = true; XmlWriter writer = XmlWriter.Create(filename, settings); // Write the Processing Instruction 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 the 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(); } }
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.
