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XmlWriter.WriteQualifiedName Method

When overridden in a derived class, writes out the namespace-qualified name. This method looks up the prefix that is in scope for the given namespace.

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

public virtual void WriteQualifiedName(
	string localName,
	string ns
)

Parameters

localName
Type: System.String

The local name to write.

ns
Type: System.String

The namespace URI for the name.

ExceptionCondition
ArgumentException

localName is either null or String.Empty.

localName is not a valid name.

If ns maps to the current default namespace, no prefix is generated.

When writing attribute values, this method generates a prefix if ns is not found. When writing element content, it throws an exception if ns is not found.

NoteNote:

If a class derived from the XmlWriter does not override this method localName is not checked to be a valid W3C XML name. In such case, before calling this method, the validity of the string can be checked by IsName method.

The example writes the following element:

<root xmlns:x="urn:abc">
  <item href="#x:test"/>
</root>
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.OmitXmlDeclaration = true;
using (XmlWriter writer = XmlWriter.Create(Console.Out, settings))
{
    writer.WriteStartElement("root");
    writer.WriteAttributeString("xmlns", "x", null, "urn:abc");
    writer.WriteStartElement("item");
    writer.WriteStartAttribute("href", null);
    writer.WriteString("#");
    writer.WriteQualifiedName("test", "urn:abc");
    writer.WriteEndAttribute();
    writer.WriteEndElement();
    writer.WriteEndElement();
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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