RoutedPropertyChangedEventArgs(T) Class
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RoutedPropertyChangedEventArgs<T> Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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:  System.Windows (in System.Windows.dll)

public class RoutedPropertyChangedEventArgs<T> : RoutedEventArgs

Type Parameters


The type of the dependency property that has changed.

The RoutedPropertyChangedEventArgs<T> type exposes the following members.

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

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 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 the Object 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 methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
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. Therefore, you can use a common event data class for different property-changed events without requiring different delegates for each possible property type.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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