Automation.RemoveAutomationFocusChangedEventHandler 方法
定义
重要
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移除指定的 focus-changed 事件处理程序。
public:
static void RemoveAutomationFocusChangedEventHandler(System::Windows::Automation::AutomationFocusChangedEventHandler ^ eventHandler);public static void RemoveAutomationFocusChangedEventHandler (System.Windows.Automation.AutomationFocusChangedEventHandler eventHandler);static member RemoveAutomationFocusChangedEventHandler : System.Windows.Automation.AutomationFocusChangedEventHandler -> unitPublic Shared Sub RemoveAutomationFocusChangedEventHandler (eventHandler As AutomationFocusChangedEventHandler)参数
- eventHandler
- AutomationFocusChangedEventHandler
传递给 的 AddAutomationFocusChangedEventHandler(AutomationFocusChangedEventHandler)处理程序方法。
注解
以下示例代码演示要添加和删除的焦点更改事件处理程序。
AutomationFocusChangedEventHandler focusHandler = null;
/// <summary>
/// Create an event handler and register it.
/// </summary>
public void SubscribeToFocusChange()
{
focusHandler = new AutomationFocusChangedEventHandler(OnFocusChange);
Automation.AddAutomationFocusChangedEventHandler(focusHandler);
}
/// <summary>
/// Handle the event.
/// </summary>
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
private void OnFocusChange(object src, AutomationFocusChangedEventArgs e)
{
// TODO Add event handling code.
// The arguments tell you which elements have lost and received focus.
}
/// <summary>
/// Cancel subscription to the event.
/// </summary>
public void UnsubscribeFocusChange()
{
if (focusHandler != null)
{
Automation.RemoveAutomationFocusChangedEventHandler(focusHandler);
}
}
Private focusHandler As AutomationFocusChangedEventHandler = Nothing
''' <summary>
''' Create an event handler and register it.
''' </summary>
Public Sub SubscribeToFocusChange()
focusHandler = New AutomationFocusChangedEventHandler(AddressOf OnFocusChange)
Automation.AddAutomationFocusChangedEventHandler(focusHandler)
End Sub
''' <summary>
''' Handle the event.
''' </summary>
''' <param name="src">Object that raised the event.</param>
''' <param name="e">Event arguments.</param>
Private Sub OnFocusChange(ByVal src As Object, ByVal e As AutomationFocusChangedEventArgs)
End Sub
' TODO Add event handling code.
' The arguments tell you which elements have lost and received focus.
''' <summary>
''' Cancel subscription to the event.
''' </summary>
Public Sub UnsubscribeFocusChange()
If (focusHandler IsNot Nothing) Then
Automation.RemoveAutomationFocusChangedEventHandler(focusHandler)
End If
End Sub
