Note

Access to this page requires authorization. You can try signing in or .

Access to this page requires authorization. You can try .

DependencyPropertyChangedEventArgs.OldValue Property

Definition

Namespace:
Microsoft.UI.Xaml

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

public:
 property Platform::Object ^ OldValue { Platform::Object ^ get(); };
IInspectable OldValue();
public object OldValue { get; }
var object = dependencyPropertyChangedEventArgs.oldValue;
Public ReadOnly Property OldValue As Object

Property Value

Object

Platform::Object

IInspectable

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.

Applies to

See also

Feedback

Was this page helpful?