SizeChangedEventArgs SizeChangedEventArgs SizeChangedEventArgs SizeChangedEventArgs Class


Provides data related to the FrameworkElement.SizeChanged event.

public : sealed class SizeChangedEventArgs : RoutedEventArgs
struct winrt::Windows::UI::Xaml::SizeChangedEventArgs : RoutedEventArgs
public sealed class SizeChangedEventArgs : RoutedEventArgs
Public NotInheritable Class SizeChangedEventArgs Inherits RoutedEventArgs

Windows 10 requirements

Device family
Windows 10 (introduced v10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced v1)


The PreviousSize value is based on ActualHeight and ActualWidth values on the element before the layout change that motivated the SizeChanged event. The NewSize value is based on the ActualHeight and ActualWidth values after the layout change is processed.

There's another event named SizeChanged that's defined by the Window class. Event handlers for Window.SizeChanged use the WindowSizeChangedEventArgs class for data. Window.SizeChanged can occur in some of the same circumstances that FrameworkElement.SizeChanged occurs; for more info, see FrameworkElement.SizeChanged.


NewSize NewSize NewSize NewSize

Gets the new size of the object reporting the size change.

OriginalSource OriginalSource OriginalSource OriginalSource

Gets a reference to the object that raised the event. This is often a template part of a control rather than an element that was declared in your app UI.

(Inherited from RoutedEventArgs)
PreviousSize PreviousSize PreviousSize PreviousSize

Gets the previous size of the object reporting the size change.

See also