AnnotationService.IsEnabled 屬性

定義

命名空間:

System.Windows.Annotations

組件:

PresentationFramework.dll

取得值，這個值表示是否啟用 AnnotationService。

public:
 property bool IsEnabled { bool get(); };

public bool IsEnabled { get; }

member this.IsEnabled : bool

Public ReadOnly Property IsEnabled As Boolean

屬性值

Boolean

如果啟用 AnnotationService 則為 true，否則為 false。

範例

下列範例示範如何在建立和啟動 AnnotationService 時使用 IsEnabled 屬性。 此外，如果使用者選擇在檢視器控制項中開啟新檔， AnnotationService 則必須停用舊檔，然後為新檔啟用 。

// ------------------------ StartAnnotations --------------------------
/// <summary>
///   Enables annotations and displays all that are viewable.</summary>
private void StartAnnotations()
{
    // If there is no AnnotationService yet, create one.
    if (_annotService == null)
        // docViewer is a document viewing control named in Window1.xaml.
        _annotService = new AnnotationService(docViewer);

    // If the AnnotationService is currently enabled, disable it.
    if (_annotService.IsEnabled == true)
        _annotService.Disable();

    // Open a stream to the file for storing annotations.
    _annotStream = new FileStream(
        _annotStorePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);

    // Create an AnnotationStore using the file stream.
    _annotStore = new XmlStreamStore(_annotStream);

    // Enable the AnnotationService using the new store.
    _annotService.Enable(_annotStore);
}// end:StartAnnotations()

' ------------------------ StartAnnotations --------------------------
''' <summary>
'''   Enables annotations and displays all that are viewable.</summary>
Private Sub StartAnnotations()
    ' If there is no AnnotationService yet, create one.
    If _annotService Is Nothing Then
        ' docViewer is a document viewing control named in Window1.xaml.
        _annotService = New AnnotationService(docViewer)
    End If

    ' If the AnnotationService is currently enabled, disable it.
    If _annotService.IsEnabled = True Then
        _annotService.Disable()
    End If

    ' Open a stream to the file for storing annotations.
    _annotStream = New FileStream(_annotStorePath, FileMode.OpenOrCreate, FileAccess.ReadWrite)

    ' Create an AnnotationStore using the file stream.
    _annotStore = New XmlStreamStore(_annotStream)

    ' Enable the AnnotationService using the new store.
    _annotService.Enable(_annotStore)
End Sub

另請參閱

• Enable(AnnotationStore)
• Disable()