XmlValidatingReader.LookupNamespace(String) Method

Reference

Definition

Namespace:: System.Xml

Assemblies:: netstandard.dll, System.Xml.ReaderWriter.dll

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Source:: XmlValidatingReader.cs

Source:: XmlValidatingReader.cs

Source:: XmlValidatingReader.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Resolves a namespace prefix in the current element's scope.

public:
 override System::String ^ LookupNamespace(System::String ^ prefix);

public override string? LookupNamespace(string prefix);

public override string LookupNamespace(string prefix);

override this.LookupNamespace : string -> string

Public Overrides Function LookupNamespace (prefix As String) As String

Parameters

prefix: String

The prefix whose namespace Uniform Resource Identifier (URI) you want to resolve. To match the default namespace, pass an empty string.

Returns

String

The namespace URI to which the prefix maps or null if no matching prefix is found.

Remarks

Note

The XmlValidatingReader class is obsolete in .NET Framework 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see the Remarks section of the XmlReader reference page.

In the following XML string, if the reader is positioned on the href attribute, the prefix a is resolved by calling reader.LookupNamespace("a", true). The returned string is urn:456.

XML

<root xmlns:a="urn:456">
 <item>
 <ref href="a:b"/>
 </item>
</root>

Applies to

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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