XmlWriter.WriteElementString Method (String, String)
Writes an element with the specified local name and value.
Assembly: System.Xml (in System.Xml.dll)
The localName value is Nothing or an empty string.
The parameter values are not valid.
There is a character in the buffer that is a valid XML character but is not valid for the output encoding. For example, if the output encoding is ASCII, you should only use characters from the range of 0 to 127 for element and attribute names. The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.
An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message “An asynchronous operation is already in progress.”
The following example uses several write methods to create an XML fragment.
Option Strict Option Explicit Imports System Imports System.IO Imports System.Xml Public Class Sample Private Shared m_Document As String = "sampledata.xml" Public Shared Sub Main() Dim writer As XmlWriter = Nothing Try Dim settings As XmlWriterSettings = new XmlWriterSettings() settings.Indent = true writer = XmlWriter.Create (m_Document, settings) writer.WriteComment("sample XML fragment") ' Write an element (this one is the root). writer.WriteStartElement("book") ' Write the namespace declaration. writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples") ' Write the genre attribute. writer.WriteAttributeString("genre", "novel") ' Write the title. writer.WriteStartElement("title") writer.WriteString("The Handmaid's Tale") writer.WriteEndElement() ' Write the price. writer.WriteElementString("price", "19.95") ' Lookup the prefix and write the ISBN element. Dim prefix As String = writer.LookupPrefix("urn:samples") writer.WriteStartElement(prefix, "ISBN", "urn:samples") writer.WriteString("1-861003-78") writer.WriteEndElement() ' Write the style element (shows a different way to handle prefixes). writer.WriteElementString("style", "urn:samples", "hardcover") ' Write the close tag for the root element. writer.WriteEndElement() ' Write the XML to file and close the writer. writer.Flush() writer.Close() Finally If Not (writer Is Nothing) Then writer.Close() End If End Try End Sub 'Main End Class 'Sample
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.