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XmlWriter.WriteStartAttribute Method (String, String)

Writes the start of an attribute with the specified local name and namespace URI.

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

public void WriteStartAttribute(
	string localName,
	string ns
)

Parameters

localName
Type: System.String

The local name of the attribute.

ns
Type: System.String

The namespace URI of the attribute.

ExceptionCondition
EncoderFallbackException

There is a character in the buffer that is a valid XML character but is not valid for the output encoding. For example, if the output encoding is ASCII, you should only use characters from the range of 0 to 127 for element and attribute names. The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

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.”

This is a more advanced version of WriteAttributeString that allows you to write an attribute value using multiple write methods, such as WriteString, WriteQualifiedName, and so on.

For the asynchronous version of this method, see WriteStartAttributeAsync.

See XmlTextWriter.WriteStartAttribute for an example using this method.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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