Public Shared ReadOnly IsBubbleSourceProperty As DependencyProperty = DependencyProperty.RegisterAttached("IsBubbleSource", GetType(Boolean), GetType(AquariumObject2))
Public Shared Sub SetIsBubbleSource(ByVal element As UIElement, ByVal value As Boolean)
element.SetValue(IsBubbleSourceProperty, value)
End Sub
Public Shared Function GetIsBubbleSource(ByVal element As UIElement) As Boolean
Return CType(element.GetValue(IsBubbleSourceProperty), Boolean)
End Function
Remarks
An attached property is a property concept defined by Extensible Application Markup Language (XAML). WPF implements attached properties as dependency properties. Because the WPF attached properties are dependency properties, they can have metadata applied that can be used by the general property system for operations such as reporting layout characteristics. For more information, see
Attached Properties Overview
.
For more information on dependency property registration, see
DependencyProperty
.
public:
static System::Windows::DependencyProperty ^ RegisterAttached(System::String ^ name, Type ^ propertyType, Type ^ ownerType, System::Windows::PropertyMetadata ^ defaultMetadata);
public static System.Windows.DependencyProperty RegisterAttached (string name, Type propertyType, Type ownerType, System.Windows.PropertyMetadata defaultMetadata);
static member RegisterAttached : string * Type * Type * System.Windows.PropertyMetadata -> System.Windows.DependencyProperty
Public Shared Function RegisterAttached (name As String, propertyType As Type, ownerType As Type, defaultMetadata As PropertyMetadata) As DependencyProperty
Parameters
Property metadata for the dependency property. This can include the default value as well as other characteristics.
Returns
Remarks
An attached property is a property concept defined by Extensible Application Markup Language (XAML). WPF implements attached properties as dependency properties. Because the WPF attached properties are dependency properties, they can have metadata applied that can be used by the general property system for operations such as reporting layout characteristics. For more information, see
Attached Properties Overview
.
For more information on dependency property registration, see
DependencyProperty
.
Use RegisterAttached for Value-inheriting Dependency Properties
One particular scenario for registering a dependency property with
RegisterAttached
instead of
Register
is to support property value inheritance. You should register value-inheriting dependency properties with
RegisterAttached
even if the class defines property wrapper accessors that expose the dependency property, and even if you do not intend to expose Get* and Set* static methods to provide true attached property support accessors. Although property value inheritance might appear to work for nonattached dependency properties, the inheritance behavior for a nonattached property through certain element boundaries in the runtime tree is undefined. Registering the property as attached effectively makes the attached property a global property to the property system, and assures that property value inheritance works across all boundaries in an element tree. Always use
RegisterAttached
to register properties where you specify
Inherits
in the metadata. For more information, see
Property Value Inheritance
.
public:
static System::Windows::DependencyProperty ^ RegisterAttached(System::String ^ name, Type ^ propertyType, Type ^ ownerType, System::Windows::PropertyMetadata ^ defaultMetadata, System::Windows::ValidateValueCallback ^ validateValueCallback);
public static System.Windows.DependencyProperty RegisterAttached (string name, Type propertyType, Type ownerType, System.Windows.PropertyMetadata defaultMetadata, System.Windows.ValidateValueCallback validateValueCallback);
static member RegisterAttached : string * Type * Type * System.Windows.PropertyMetadata * System.Windows.ValidateValueCallback -> System.Windows.DependencyProperty
Public Shared Function RegisterAttached (name As String, propertyType As Type, ownerType As Type, defaultMetadata As PropertyMetadata, validateValueCallback As ValidateValueCallback) As DependencyProperty
Parameters
A reference to a callback that should perform any custom validation of the dependency property value beyond typical type validation.
Returns
Examples
The following example registers an attached property on an abstract class using this
RegisterAttached
signature. This attached property is an enumeration type property, and the registration adds a validation callback to verify that the provided value is a value of the enumeration.
public static readonly DependencyProperty IsBubbleSourceProperty = DependencyProperty.RegisterAttached(
"IsBubbleSource",
typeof(Boolean),
typeof(AquariumObject2)
public static void SetIsBubbleSource(UIElement element, Boolean value)
element.SetValue(IsBubbleSourceProperty, value);
public static Boolean GetIsBubbleSource(UIElement element)
return (Boolean)element.GetValue(IsBubbleSourceProperty);
Public Shared ReadOnly IsBubbleSourceProperty As DependencyProperty = DependencyProperty.RegisterAttached("IsBubbleSource", GetType(Boolean), GetType(AquariumObject2))
Public Shared Sub SetIsBubbleSource(ByVal element As UIElement, ByVal value As Boolean)
element.SetValue(IsBubbleSourceProperty, value)
End Sub
Public Shared Function GetIsBubbleSource(ByVal element As UIElement) As Boolean
Return CType(element.GetValue(IsBubbleSourceProperty), Boolean)
End Function
Remarks
An attached property is a property concept defined by Extensible Application Markup Language (XAML). WPF implements attached properties as dependency properties. Because the WPF attached properties are dependency properties, they can have metadata applied that can be used by the general property system for operations such as reporting layout characteristics. For more information, see
Attached Properties Overview
.
For more information on dependency property registration, see
DependencyProperty
.
Use RegisterAttached for Value-inheriting Dependency Properties
One particular scenario for registering a dependency property with
RegisterAttached
instead of
Register
is to support property value inheritance. You should register value-inheriting dependency properties with
RegisterAttached
even if the class defines property wrapper accessors that expose the dependency property, and even if you do not intend to expose Get* and Set* static methods to provide true attached property support accessors. Although property value inheritance might appear to work for nonattached dependency properties, the inheritance behavior for a nonattached property through certain element boundaries in the runtime tree is undefined. Registering the property as attached effectively makes the attached property a global property to the property system, and assures that property value inheritance works across all boundaries in an element tree. Always use
RegisterAttached
to register properties where you specify
Inherits
in the metadata. For more information, see
Property Value Inheritance
.
