AutomationEventArgs.EventId 属性

定义

命名空间:

System.Windows.Automation

程序集:

UIAutomationTypes.dll

获取事件标识符。

public:
 property System::Windows::Automation::AutomationEvent ^ EventId { System::Windows::Automation::AutomationEvent ^ get(); };

public System.Windows.Automation.AutomationEvent EventId { get; }

member this.EventId : System.Windows.Automation.AutomationEvent

Public ReadOnly Property EventId As AutomationEvent

属性值

AutomationEvent

事件标识符。

示例

在下面的示例中，事件处理程序检查 EventId 事件并相应地处理事件。

/// <summary>
/// AutomationEventHandler delegate.
/// </summary>
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
private void OnUIAutomationEvent(object src, AutomationEventArgs e)
{
    // Make sure the element still exists. Elements such as tooltips
    // can disappear before the event is processed.
    AutomationElement sourceElement;
    try
    {
        sourceElement = src as AutomationElement;
    }
    catch (ElementNotAvailableException)
    {
        return;
    }
    if (e.EventId == InvokePattern.InvokedEvent)
    {
        // TODO Add handling code.
    }
    else
    {
        // TODO Handle any other events that have been subscribed to.
    }
}

''' <summary>
''' AutomationEventHandler delegate.
''' </summary>
''' <param name="src">Object that raised the event.</param>
''' <param name="e">Event arguments.</param>
Private Sub OnUIAutomationEvent(ByVal src As Object, ByVal e As AutomationEventArgs)
    ' Make sure the element still exists. Elements such as tooltips can disappear
    ' before the event is processed.
    Dim sourceElement As AutomationElement
    Try
        sourceElement = DirectCast(src, AutomationElement)
    Catch ex As ElementNotAvailableException
        Exit Sub
    End Try
    If e.EventId Is InvokePattern.InvokedEvent Then
        ' TODO Add handling code.
    Else
    End If
    ' TODO Handle any other events that have been subscribed to.
    Console.WriteLine("Event: " & e.EventId.ProgrammaticName)
End Sub

注解

如果客户端使用同 AutomationEventHandler 一实例为多个事件添加了事件处理程序， EventId 则可以用于标识委托应处理的事件。