XmlWriter.WriteQualifiedNameAsync Method (String, String)

.NET Framework (current version)

Asynchronously writes out the namespace-qualified name. This method looks up the prefix that is in scope for the given namespace.

Namespace:   System.Xml
Assembly:  System.Xml (in System.Xml.dll)

Public Overridable Function WriteQualifiedNameAsync (
	localName As String,
	ns As String
) As Task


Type: System.String

The local name to write.

Type: System.String

The namespace URI for the name.

Return Value

Type: System.Threading.Tasks.Task

The task that represents the asynchronous WriteQualifiedName operation.

Exception Condition

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.”

This is the asynchronous version of WriteQualifiedName, with the same functionality. To use this method, you must set the Async flag to true.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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