WriteStartElementAsync Method
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XmlWriter.WriteStartElementAsync Method (String, String, String)

.NET Framework 4.6 and 4.5

Asynchronously writes the specified start tag and associates it with the given namespace and prefix.

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

public virtual Task WriteStartElementAsync(
	string prefix,
	string localName,
	string ns


Type: System.String

The namespace prefix of the element.

Type: System.String

The local name of the element.

Type: System.String

The namespace URI to associate with the element.

Return Value

Type: System.Threading.Tasks.Task

The task that represents the asynchronous WriteStartElement 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 WriteStartElement, 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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