AutomationPropertyChangedEventArgs(AutomationProperty, Object, Object) 생성자

정의

네임스페이스:

System.Windows.Automation

어셈블리:

UIAutomationTypes.dll

AutomationPropertyChangedEventArgs 클래스의 새 인스턴스를 초기화합니다.

public:
 AutomationPropertyChangedEventArgs(System::Windows::Automation::AutomationProperty ^ property, System::Object ^ oldValue, System::Object ^ newValue);

public AutomationPropertyChangedEventArgs (System.Windows.Automation.AutomationProperty property, object oldValue, object newValue);

new System.Windows.Automation.AutomationPropertyChangedEventArgs : System.Windows.Automation.AutomationProperty * obj * obj -> System.Windows.Automation.AutomationPropertyChangedEventArgs

Public Sub New (property As AutomationProperty, oldValue As Object, newValue As Object)

매개 변수

property

AutomationProperty

변경된 속성의 식별자입니다.

oldValue

Object

속성의 이전 값입니다.

newValue

Object

속성의 새 값입니다.

예제

다음 예제에서는 생성 하 고는 속성이 변경 되 면 이벤트를 발생 시킵니다.

/// <summary>
/// Raises an event when the IsEnabled property on a control is changed.
/// </summary>
/// <param name="provider">The UI Automation provider for the control.</param>
/// <param name="newValue">The current enabled state.</param>
private void RaiseEnabledEvent(IRawElementProviderSimple provider, bool newValue)
{
    if (AutomationInteropProvider.ClientsAreListening)
    {
        AutomationPropertyChangedEventArgs args =
            new AutomationPropertyChangedEventArgs(AutomationElement.IsEnabledProperty,
                !newValue, newValue);
        AutomationInteropProvider.RaiseAutomationPropertyChangedEvent(provider, args);
    }
}

''' <summary>
''' Raises an event when the IsEnabled property on a control is changed.
''' </summary>
''' <param name="provider">The UI Automation provider for the control.</param>
''' <param name="newValue">The current enabled state.</param>
Private Sub RaiseEnabledEvent(ByVal provider As IRawElementProviderSimple, ByVal newValue As Boolean) 
    If AutomationInteropProvider.ClientsAreListening Then
        Dim args As New AutomationPropertyChangedEventArgs(AutomationElement.IsEnabledProperty, Not newValue, newValue)
        AutomationInteropProvider.RaiseAutomationPropertyChangedEvent(provider, args)
    End If

End Sub

설명

oldValue 일 수 있습니다 null (Nothing Visual Basic에서) 이전 값을 쉽게 사용할 수 없는 경우.