DependencyPropertyChangedEventArgs Structure
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Provides data for a PropertyChangedCallback implementation.
Assembly: System.Windows (in System.Windows.dll)
The DependencyPropertyChangedEventArgs type exposes the following members.
| Name | Description | |
|---|---|---|
 | Equals | Indicates whether this instance and a specified object are equal. (Inherited from ValueType.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Returns the hash code for this instance. (Inherited from ValueType.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ToString | Returns the fully qualified type name of this instance. (Inherited from ValueType.) |
The scenario for PropertyChangedCallback is to use the arguments to report old and new values that come from the property system evaluation of the property. A callback that processes old and new values might choose special handling depending on these values. Some example scenarios include:
Choosing to not respond to value changes that are deemed insignificant.
Rejecting property changes that fail a property-specific or circumstantial validation.
Checking/setting other property values that exist in a dependency relationship with the property that changed.
Raising an event from the class.