Obter o estado Toggle de uma caixa de seleção usando automação de interface do usuário

Este tópico mostra como usar a Automação da Interface do Usuário da Microsoft para obter o estado de alternância de um controle.

Exemplo

Este exemplo usa o método GetCurrentPattern da classe AutomationElement para obter um objeto TogglePattern de um controle e retornar a propriedade ToggleState.

/// <summary>
/// Gets the toggle state of an element in the target application.
/// </summary>
/// <param name="element">The target element.</param>
private bool IsElementToggledOn(AutomationElement element)
{
    if (element == null)
    {
        // TODO: Invalid parameter error handling.
        return false;
    }

    Object objPattern;
    TogglePattern togPattern;
    if (true == element.TryGetCurrentPattern(TogglePattern.Pattern, out objPattern))
    {
        togPattern = objPattern as TogglePattern;
        return togPattern.Current.ToggleState == ToggleState.On;
    }
    // TODO: Object doesn't support TogglePattern error handling.
    return false;
}

''' <summary>
''' Gets the toggle state of an element in the target application.
''' </summary>
''' <param name="element">The target element.</param>
Private Function IsElementToggledOn(ByVal element As AutomationElement) As Boolean
    If element Is Nothing Then
        ' TODO: Invalid parameter error handling.
        Return False
    End If

    Dim objPattern As Object = Nothing
    Dim togPattern As TogglePattern
    If True = element.TryGetCurrentPattern(TogglePattern.Pattern, objPattern) Then
        togPattern = TryCast(objPattern, TogglePattern)
        Return togPattern.Current.ToggleState = ToggleState.On
    End If
    ' TODO: Object doesn't support TogglePattern error handling.
    Return False
End Function