Windows.UI.Xaml.DependencyPropertyChangedEventArgs.OldValue

-description

Gets the value of the dependency property before the reported change.

-property-value

The dependency property value before the change.

-remarks

The OldValue value is often used as the value that the property is set to from within the callback, in case the NewValue value is not considered a valid value for your property's logic . For example, if you are using the callback for validation of an input value for a property that the user can set in UI, the previous value is typically a better value to use as the current value rather than resetting the value to a default. The callback is effectively canceling a change.

-examples

-see-also

Dependency properties overview