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XmlWriter.WriteAttributeStringAsync Method (String, String, String, String)

.NET Framework 4.6 and 4.5

Asynchronously writes out the attribute with the specified prefix, local name, namespace URI, and value.

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

public Task WriteAttributeStringAsync(
	string prefix,
	string localName,
	string ns,
	string value


Type: System.String

The namespace prefix of the attribute.

Type: System.String

The local name of the attribute.

Type: System.String

The namespace URI of the attribute.

Type: System.String

The value of the attribute.

Return Value

Type: System.Threading.Tasks.Task

The task that represents the asynchronous WriteAttributeString 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 WriteAttributeString, 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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