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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.

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.”

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.

For the asynchronous version of this method, see WriteQualifiedNameAsync.

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();
}

.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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