Class RoutedPropertyChangingEventArgs<T>

Provides event data for various routed events that track property values changing. Typically the events denote a cancellable action.

Inheritance

System.Object

System.EventArgs

RoutedEventArgs

RoutedPropertyChangingEventArgs<T>

Inherited Members

RoutedEventArgs.OriginalSource

System.EventArgs.Empty

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: System.Windows.Controls

Assembly: OpenSilver.Controls.dll

Syntax

public class RoutedPropertyChangingEventArgs<T> : RoutedEventArgs

Type Parameters

Name	Description
T	The type of the value for the dependency property that is changing.

Constructors

RoutedPropertyChangingEventArgs(DependencyProperty, T, T, Boolean)

Initializes a new instance of the RoutedPropertyChangingEventArgs<T> class.

Declaration

public RoutedPropertyChangingEventArgs(DependencyProperty property, T oldValue, T newValue, bool isCancelable)

Parameters

Type	Name	Description
DependencyProperty	property	The DependencyProperty identifier for the property that is changing.
T	oldValue	The previous value of the property.
T	newValue	The new value of the property, assuming that the property change is not cancelled.
System.Boolean	isCancelable	True if the property change is cancellable by setting Cancel to true in event handling. false if the property change is not cancellable.

Properties

Cancel

Gets or sets a value indicating whether the property change that originated the RoutedPropertyChanging event should be cancelled.

Declaration

public bool Cancel { get; set; }

Property Value

Type	Description
System.Boolean	True to cancel the property change; this resets the property to OldValue. false to not cancel the property change; the value changes to NewValue.

Exceptions

Type	Condition
System.InvalidOperationException	Attempted to cancel in an instance where IsCancelable is false.

InCoercion

Gets or sets a value indicating whether internal value coercion is acting on the property change that originated the RoutedPropertyChanging event.

Declaration

public bool InCoercion { get; set; }

Property Value

Type	Description
System.Boolean	True if coercion is active. false if coercion is not active.

Remarks

This is a total hack to work around the class hierarchy for Value coercion in NumericUpDown.

IsCancelable

Gets a value indicating whether the property change that originated the RoutedPropertyChanging event is cancellable.

Declaration

public bool IsCancelable { get; }

Property Value

Type	Description
System.Boolean	True if the property change is cancellable. false if the property change is not cancellable.

NewValue

Gets or sets a value that reports the new value of the changing property, assuming that the property change is not cancelled.

Declaration

public T NewValue { get; set; }

Property Value

Type	Description
T	The new value of the changing property.

OldValue

Gets a value that reports the previous value of the changing property.

Declaration

public T OldValue { get; }

Property Value

Type	Description
T	The previous value of the changing property.

Property

Gets the DependencyProperty identifier for the property that is changing.

Declaration

public DependencyProperty Property { get; }

Property Value

Type	Description
DependencyProperty	The DependencyProperty identifier for the property that is changing.