DependencyPropertyChangedEventArgs.NewValue 속성


변경 후의 속성 값을 가져옵니다.Gets the value of the property after the change.

 property System::Object ^ NewValue { System::Object ^ get(); };
public object NewValue { get; }
member this.NewValue : obj
Public ReadOnly Property NewValue As Object

속성 값

변경 후의 속성 값입니다.The property value after the change.


다음 예제에서는 합니다 DependencyPropertyChangedEventArgs 클래스의 컨텍스트에서 PropertyChangedCallback 도 이벤트를 정의 하는 사용자 지정 클래스의 특정 속성에 대 한 합니다.The following example uses the DependencyPropertyChangedEventArgs class in the context of a PropertyChangedCallback for a particular property of a custom class that also defines events. 콜백에 결과 이전 및 속성 시스템에서 새 값에서 전달한 DependencyPropertyChangedEventArgs, 이러한 다양 한 이벤트 인수 클래스를 가져오며 RoutedPropertyChangedEventArgs<T>합니다.The callback takes the results of old and new values from the property system as communicated by DependencyPropertyChangedEventArgs, and repackages these into a different events arguments class RoutedPropertyChangedEventArgs<T>. 새 인수 다음에 의해 정의 되며 사용자 지정 클래스에 의해 발생 "ValueChanged" 이벤트 데이터로 사용 됩니다.The new arguments are then used as the data for a "ValueChanged" event defined by and raised by the custom class.

public static readonly DependencyProperty ValueProperty =
        "Value", typeof(decimal), typeof(NumericUpDown),
        new FrameworkPropertyMetadata(MinValue, new PropertyChangedCallback(OnValueChanged),
                                      new CoerceValueCallback(CoerceValue)));

private static object CoerceValue(DependencyObject element, object value)
    decimal newValue = (decimal)value;

    newValue = Math.Max(MinValue, Math.Min(MaxValue, newValue));

    return newValue;

private static void OnValueChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
    NumericUpDown control = (NumericUpDown)obj;

    RoutedPropertyChangedEventArgs<decimal> e = new RoutedPropertyChangedEventArgs<decimal>(
        (decimal)args.OldValue, (decimal)args.NewValue, ValueChangedEvent);
/// <summary>
/// Identifies the ValueChanged routed event.
/// </summary>
public static readonly RoutedEvent ValueChangedEvent = EventManager.RegisterRoutedEvent(
    "ValueChanged", RoutingStrategy.Bubble,
    typeof(RoutedPropertyChangedEventHandler<decimal>), typeof(NumericUpDown));

/// <summary>
/// Occurs when the Value property changes.
/// </summary>
public event RoutedPropertyChangedEventHandler<decimal> ValueChanged
    add { AddHandler(ValueChangedEvent, value); }
    remove { RemoveHandler(ValueChangedEvent, value); }
/// <summary>
/// Raises the ValueChanged event.
/// </summary>
/// <param name="args">Arguments associated with the ValueChanged event.</param>
protected virtual void OnValueChanged(RoutedPropertyChangedEventArgs<decimal> args)
Public Shared ReadOnly ValueProperty As DependencyProperty = DependencyProperty.Register("Value", GetType(Decimal), GetType(NumericUpDown), New FrameworkPropertyMetadata(MinValue, New PropertyChangedCallback(AddressOf OnValueChanged), New CoerceValueCallback(AddressOf CoerceValue)))

Private Shared Overloads Function CoerceValue(ByVal element As DependencyObject, ByVal value As Object) As Object
    Dim newValue As Decimal = CDec(value)

    newValue = Math.Max(MinValue, Math.Min(MaxValue, newValue))

    Return newValue
End Function

Private Shared Sub OnValueChanged(ByVal obj As DependencyObject, ByVal args As DependencyPropertyChangedEventArgs)
    Dim control As NumericUpDown = CType(obj, NumericUpDown)

    Dim e As New RoutedPropertyChangedEventArgs(Of Decimal)(CDec(args.OldValue), CDec(args.NewValue), ValueChangedEvent)
End Sub
''' <summary>
''' Identifies the ValueChanged routed event.
''' </summary>
Public Shared ReadOnly ValueChangedEvent As RoutedEvent = EventManager.RegisterRoutedEvent("ValueChanged", RoutingStrategy.Bubble, GetType(RoutedPropertyChangedEventHandler(Of Decimal)), GetType(NumericUpDown))

''' <summary>
''' Occurs when the Value property changes.
''' </summary>
Public Custom Event ValueChanged As RoutedPropertyChangedEventHandler(Of Decimal)
    AddHandler(ByVal value As RoutedPropertyChangedEventHandler(Of Decimal))
        MyBase.AddHandler(ValueChangedEvent, value)
    End AddHandler
    RemoveHandler(ByVal value As RoutedPropertyChangedEventHandler(Of Decimal))
        MyBase.RemoveHandler(ValueChangedEvent, value)
    End RemoveHandler
    RaiseEvent(ByVal sender As System.Object, ByVal e As RoutedPropertyChangedEventArgs(Of Decimal))
    End RaiseEvent
End Event
''' <summary>
''' Raises the ValueChanged event.
''' </summary>
''' <param name="args">Arguments associated with the ValueChanged event.</param>
Protected Overridable Sub OnValueChanged(ByVal args As RoutedPropertyChangedEventArgs(Of Decimal))
End Sub


제공 된 값 형식의 항상 보고 되는 종속성 속성의 형식으로 캐스팅할 수 있는 이어야 합니다.The type of the value provided should always be castable to the type of the dependency property being reported.

적용 대상