PropertyChangedCallback PropertyChangedCallback PropertyChangedCallback PropertyChangedCallback Delegate


Represents the callback that is invoked when the effective property value of a dependency property changes.

public : delegate void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
struct PropertyChangedCallback : winrt::Windows::Foundation::IUnknown
   PropertyChangedCallback(std::nullptr_t = nullptr) noexcept;
   template <typename L> PropertyChangedCallback(L lambda);
   template <typename F> PropertyChangedCallback(F* function);
   template <typename O, typename M> PropertyChangedCallback(O* object, M method);
   void operator()(winrt::Windows::UI::Xaml::DependencyObject const& d, winrt::Windows::UI::Xaml::DependencyPropertyChangedEventArgs const& e) const;
public delegate void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
Public Delegate Sub PropertyChangedCallback(d As DependencyObject, e As DependencyPropertyChangedEventArgs)


DependencyObject DependencyObject

The DependencyObject on which the property has changed value.

DependencyPropertyChangedEventArgs DependencyPropertyChangedEventArgs

Event data that is issued by any event that tracks changes to the effective value of this property.


Windows 10 requirements

Device family
Windows 10 (introduced v10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced v1)


You implement callbacks based on this delegate to provide the property-changed behavior for a custom dependency property. You might use this callback to provide value constraints, or to initiate value changes in other properties that depend on the value of the property that is being changed. For more info see Custom dependency properties.

See also