XmlStreamStore.Flush 方法

定义

命名空间:

System.Windows.Annotations.Storage

程序集:

PresentationFramework.dll

强制将内部缓冲区中保留的所有批注数据写入基础存储设备中。

public:
 override void Flush();

public override void Flush ();

override this.Flush : unit -> unit

Public Overrides Sub Flush ()

例外

ObjectDisposedException

已在存储区上调用 Dispose。

InvalidOperationException

还没有为存储区设置 I/O Stream。

UnauthorizedAccessException

存储区 I/O Stream 为只读，且无法进行输出访问。

示例

下面的示例演示如何在应用程序关闭AnnotationService时使用Flush该方法。

// -------------------------- StopAnnotations -------------------------
/// <summary>
///   Disables annotations processing and hides annotations.</summary>
public void StopAnnotations()
{
    // If the AnnotationStore is active, flush and close it.
    if ( (_annotService != null) && _annotService.IsEnabled )
    {
        _annotService.Store.Flush();
        _annotStream.Flush();
        _annotStream.Close();
    }

    // If the AnnotationService is active, shut it down.
    if (_annotService != null)
    {
        if (_annotService.IsEnabled)
            _annotService.Disable();
        _annotService = null;
    }
}// end:StopAnnotations()

' -------------------------- StopAnnotations -------------------------
''' <summary>
'''   Disables annotations processing and hides annotations.</summary>
Public Sub StopAnnotations()
    ' If the AnnotationStore is active, flush and close it.
    If (_annotService IsNot Nothing) AndAlso _annotService.IsEnabled Then
        _annotService.Store.Flush()
        _annotStream.Flush()
        _annotStream.Close()
    End If

    ' If the AnnotationService is active, shut it down.
    If _annotService IsNot Nothing Then
        If _annotService.IsEnabled Then
            _annotService.Disable()
        End If
        _annotService = Nothing
    End If
End Sub

以下示例演示了 DeleteAnnotation 如何使用和 Flush 方法。

// ------------------------- DeleteMark_Click -------------------------
void DeleteMark_Click(object sender, RoutedEventArgs e)
{
    Annotation ann = ((MenuItem)sender).Tag as Annotation;
    _annStore.DeleteAnnotation(ann.Id);
    _annStore.Flush();

    MenuItem thisMenu = sender as MenuItem;
    ContextMenu parentMenu = thisMenu.Parent as ContextMenu;
    FrameworkElement dObj =
        parentMenu.PlacementTarget as FrameworkElement;
    while (!(dObj is StackPanel))
    {
        dObj = dObj.Parent as FrameworkElement;
    }

    ListBox collection = dObj.Parent as ListBox;
    collection.Items.Remove(dObj);
    Util.FlushDispatcher();
}

另请参阅

• AutoFlush