Artikel
11/18/2011

XmlnsDefinitionAttribute Class

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

Specifies a mapping in an assembly between an XML namespace identifier and a CLR namespace within that assembly.

Inheritance Hierarchy

System.Object
System.Attribute
System.Windows.Markup.XmlnsDefinitionAttribute

Namespace: System.Windows.Markup
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Assembly, AllowMultiple := True)> _
Public NotInheritable Class XmlnsDefinitionAttribute _
    Inherits Attribute

[AttributeUsageAttribute(AttributeTargets.Assembly, AllowMultiple = true)]
public sealed class XmlnsDefinitionAttribute : Attribute

The XmlnsDefinitionAttribute type exposes the following members.

Constructors

	Name	Description
	XmlnsDefinitionAttribute	Initializes a new instance of the XmlnsDefinitionAttribute class.

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Properties

	Name	Description
	AssemblyName	Gets or sets the name of the assembly that contains the ClrNamespace.
	ClrNamespace	Gets the CLR namespace that is mapped to XmlNamespace by the attribute.
	XmlNamespace	Gets the XML namespace (xmlns) that is mapped to ClrNamespace by the attribute.

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

In a XAML file, if the xmlns attribute for an element tag or attribute matches the XmlNamespace in the XmlnsDefinitionAttribute, a XAML processor can use the ClrNamespace and AssemblyName stored in the XmlnsDefinitionAttribute to check if the element or attribute matches any type inside the namespace in the assembly. This is how a XAML processor can discover the assemblies that define the types that are created when processing XAML into an object tree. In particular, a XAML processor uses XmlnsDefinitionAttribute from known and loaded reference assemblies for cases where the namespace identifier is a URI, and the namespace is not defined by an explicit CLR-namespace/assembly combination.

For more information on how to use XmlnsDefinitionAttribute and XmlnsPrefixAttribute to declare XAML namespaces and hint a prefix for designers, see "Applying XAML Namespace Attributes to Custom Assemblies" section of Silverlight XAML Namespaces, and Mapping XAML Namespaces as Prefixes.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, 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.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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