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XmlWriter.WriteQualifiedName Method

.NET Framework 4

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)

Syntax

C++

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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.

Exceptions

Exception	Condition
ArgumentException	localName is either null or String.Empty. localName is not a valid name.

Exception

Condition

ArgumentException

localName is either null or String.Empty.

localName is not a valid name.

Remarks

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.

Note
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.

Examples

The example writes the following element:

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<root xmlns:x="urn:abc">
  <item href="#x:test"/>
</root>

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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();
}

Version Information

.NET Framework

Supported in: 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

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Reference

XmlWriter Class

System.Xml Namespace

Other Resources

Writing XML with the XmlWriter

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