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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.


Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)

generic<typename T>
public ref class RoutedPropertyChangedEventArgs : public RoutedEventArgs

Type Parameters


The type of the dependency property that has changed.

The RoutedPropertyChangedEventArgs<T> type exposes the following members.

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

Public propertyHandledGets 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.)
Public propertyNewValueGets the new value of a property as reported by a property changed event.
Public propertyOldValueGets the previous value of the property as reported by a property changed event.
Public propertyOriginalSourceGets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. (Inherited from RoutedEventArgs.)
Public propertyRoutedEventGets or sets the RoutedEvent associated with this RoutedEventArgs instance. (Inherited from RoutedEventArgs.)
Public propertySourceGets or sets a reference to the object that raised the event. (Inherited from RoutedEventArgs.)

Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
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 methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodInvokeEventHandlerInvokes event handlers in a type-specific way, which can increase event system efficiency. (Overrides RoutedEventArgs::InvokeEventHandler(Delegate, Object).)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnSetSourceWhen 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.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

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.

.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.