XmlWriter.WriteStartDocumentAsync Method (Boolean)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Asynchronously writes the XML declaration with the version "1.0" and the standalone attribute.
Assembly: System.Xml (in System.Xml.dll)
Public Overridable Function WriteStartDocumentAsync ( _ standalone As Boolean _ ) As Task
public virtual Task WriteStartDocumentAsync( bool standalone )
If true, it writes "standalone=yes"; if false, it writes "standalone=no".
The task that represents the asynchronous WriteStartDocument operation.
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.”
An XmlWriter asynchronous method was called without setting the Async flag to true. In this case, InvalidOperationException is thrown with the message “Set XmlWriterSettings.Async to true if you want to use Async Methods.”
Windows Phone OS
Supported in: 8.1, 8.0