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XmlWriter.WriteAttributeString Method (String, String, String)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When overridden in a derived class, writes an attribute with the specified local name, namespace URI, and value.

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

Syntax

'Declaration
Public Sub WriteAttributeString ( _
    localName As String, _
    ns As String, _
    value As String _
)

public void WriteAttributeString(
    string localName,
    string ns,
    string value
)

Parameters

  • ns
    Type: System.String
    The namespace URI to associate with the attribute.

Exceptions

Exception Condition
InvalidOperationException

The state of writer is not WriteState.Element or writer is closed.
ArgumentException

The xml:space or xml:lang attribute value is invalid.

Remarks

This method writes out the attribute with a user defined namespace prefix and associates it with the given namespace. If localName is "xmlns" then this method also treats this as a namespace declaration. In this case, the ns argument can be nulla null reference (Nothing in Visual Basic).

WriteAttributeString does the following:

  • If the attribute value includes double or single quotes, they are replaced with " and ' respectively.

  • If writing an xml:space attribute, the writer verifies the attribute value is valid. (Valid values are preserve or default.)

  • If writing an xml:lang attribute, the writer does not verify that the attribute value is valid according to the W3C XML 1.0 recommendation.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.