XmlnsDefinitionAttribute Class

Specifies a mapping on a per-assembly basis between a XAML namespace and a CLR namespace, which is then used for type resolution by a XAML object writer or XAML schema context.

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

Namespace:  System.Windows.Markup
Assembly:  System.Xaml (in System.Xaml.dll)
XMLNS for XAML: Not mapped to an xmlns.

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

The XmlnsDefinitionAttribute type exposes the following members.

  NameDescription
Public methodXmlnsDefinitionAttributeInitializes a new instance of the XmlnsDefinitionAttribute class.
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  NameDescription
Public propertyAssemblyNameGets or sets the name of the assembly associated with the attribute.
Public propertyClrNamespaceGets the string name of the CLR namespace specified in this attribute 
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public propertyXmlNamespaceGets the XAML namespace identifier specified in this attribute.
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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Apply one or more XmlnsDefinitionAttribute attributes to assemblies in order to identify the types within the assembly for XAML usage.

To find the appropriate types that back object element usages or object references in a XAML file, a XAML processor searches each referenced assembly for XmlnsDefinitionAttribute applications. Generally the XAML schema context supplies this information.

In a XAML file, if the xmlns attribute for an object element or property element matches the XmlNamespace in the XmlnsDefinitionAttribute, the XAML processor uses the ClrNamespace and AssemblyName stored in the XmlnsDefinitionAttribute for type resolution against types in the assembly.

In previous versions of the .NET Framework, this class existed in the WPF-specific assembly WindowsBase. In .NET Framework version 4, XmlnsDefinitionAttribute is in the System.Xaml assembly. For more information, see Types Migrated from WPF to System.Xaml.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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.

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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