RoutedPropertyChangedEventArgs<T> Class


Provides data about a change in value to a dependency property as reported by particular routed events, including the previous and current value of the property that changed.

generic <typename T>
public ref class RoutedPropertyChangedEventArgs : System::Windows::RoutedEventArgs
public class RoutedPropertyChangedEventArgs<T> : System.Windows.RoutedEventArgs
type RoutedPropertyChangedEventArgs<'T> = class
    inherit RoutedEventArgs
Public Class RoutedPropertyChangedEventArgs(Of T)
Inherits RoutedEventArgs

Type Parameters


The type of the dependency property that has changed.



This is a generic class where the class is used for event data of different events. Different routed events can specify the type constraint of the generic to produce a type-specific event data class. Once the class is constrained, the OldValue and NewValue properties also reflect these type constraints; thus you can use a common event data class for different property changed events without requiring different delegates for each possible property type.

Routed events that reports a property change where the delegate incorporates this event data class include ValueChanged, where the type constraint (and old and new values passed in the arguments) is of type Double, and SelectedItemChanged, where the type constraint is Object.


RoutedPropertyChangedEventArgs<T>(T, T)

Initializes a new instance of the RoutedPropertyChangedEventArgs<T> class, with provided old and new values.

RoutedPropertyChangedEventArgs<T>(T, T, RoutedEvent)

Initializes a new instance of the RoutedPropertyChangedEventArgs<T> class, with provided old and new values, and an event identifier.



Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route.

(Inherited from RoutedEventArgs)

Gets the new value of a property as reported by a property changed event.


Gets the previous value of the property as reported by a property changed event.


Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class.

(Inherited from RoutedEventArgs)

Gets or sets the RoutedEvent associated with this RoutedEventArgs instance.

(Inherited from RoutedEventArgs)

Gets or sets a reference to the object that raised the event.

(Inherited from RoutedEventArgs)



Determines whether the specified object is equal to the current object.

(Inherited from Object)

Serves as the default hash function.

(Inherited from Object)

Gets the Type of the current instance.

(Inherited from Object)
InvokeEventHandler(Delegate, Object)

Invokes event handlers in a type-specific way, which can increase event system efficiency.


Creates a shallow copy of the current Object.

(Inherited from Object)

When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes.

(Inherited from RoutedEventArgs)

Returns a string that represents the current object.

(Inherited from Object)

Applies to

See also