DependencyPropertyChangedEventArgs.NewValue DependencyPropertyChangedEventArgs.NewValue DependencyPropertyChangedEventArgs.NewValue DependencyPropertyChangedEventArgs.NewValue Property

定義

変更後のプロパティの値を取得します。Gets the value of the property after the change.

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

プロパティ値

変更後のプロパティの値。The property value after the change.

次の例ではDependencyPropertyChangedEventArgs 、イベントも定義するカスタムPropertyChangedCallbackクラスの特定のプロパティについて、のコンテキストでクラスを使用します。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. コールバックは、によってDependencyPropertyChangedEventArgs伝達されるプロパティシステムから、古い値と新しい値の結果を受け取り、それらを別の events arguments クラスRoutedPropertyChangedEventArgs<T>に再パッケージ化します。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>. 新しい引数は、カスタムクラスによって定義および発生した "ValueChanged" イベントのデータとして使用されます。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 =
    DependencyProperty.Register(
        "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);
    control.OnValueChanged(e);
}
/// <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)
{
    RaiseEvent(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)
	control.OnValueChanged(e)
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))
	MyBase.RaiseEvent(args)
End Sub

注釈

指定された値の型は、常に、報告される依存関係プロパティの型に対してキャストである必要があります。The type of the value provided should always be castable to the type of the dependency property being reported.

適用対象