July 28, 2014
Provides data for a PropertyChangedCallback implementation.
Assembly: System.Windows (in System.Windows.dll)
Thetype exposes the following members.
|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.