WriteStartAttributeAsync Method
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XmlWriter.WriteStartAttributeAsync Method (String, String, String)

.NET Framework (current version)
 

Asynchronously writes the start of an attribute with the specified prefix, local name, and namespace URI.

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

protected internal virtual Task WriteStartAttributeAsync(
	string prefix,
	string localName,
	string ns
)

Parameters

prefix
Type: System.String

The namespace prefix of the attribute.

localName
Type: System.String

The local name of the attribute.

ns
Type: System.String

The namespace URI for the attribute.

Return Value

Type: System.Threading.Tasks.Task

The task that represents the asynchronous WriteStartAttribute operation.

Exception Condition
InvalidOperationException

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.”

InvalidOperationException

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 WriteStartAttribute, 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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