WriteAttributesAsync Method
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XmlWriter.WriteAttributesAsync Method (XmlReader, Boolean)

.NET Framework 4.6 and 4.5

Asynchronously writes out all the attributes found at the current position in the XmlReader.

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

public virtual Task WriteAttributesAsync(
	XmlReader reader,
	bool defattr


Type: System.Xml.XmlReader

The XmlReader from which to copy the attributes.

Type: System.Boolean

true to copy the default attributes from the XmlReader; otherwise, false.

Return Value

Type: System.Threading.Tasks.Task

The task that represents the asynchronous WriteAttributes 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 WriteAttributes, with the same functionality. To use this method, you must set the Async flag to true.

Universal Windows Platform
Available since 4.5
.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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