XmlnsDefinitionAttribute Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Specifies a mapping in an assembly between an XML namespace identifier and a CLR namespace within that assembly.
Assembly: System.Windows (in System.Windows.dll)
The XmlnsDefinitionAttribute type exposes the following members.
| Name | Description | |
|---|---|---|
 | XmlnsDefinitionAttribute | Initializes a new instance of the XmlnsDefinitionAttribute class. |
| 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. |
| 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.) |
 Note: |
|---|
App assemblies are delay-loaded to improve start time. Consequently, this class is not supported in Windows Phone OS 7.1 or in Windows Phone 8. |
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 whether 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 it processes XAML into an object tree. In particular, a XAML processor uses XmlnsDefinitionAttribute from known and loaded reference assemblies when the namespace identifier is a URI, and the namespace is not defined by an explicit CLR-namespace/assembly combination.