AnnotationHelper.GetAnchorInfo(AnnotationService, Annotation) 方法

定义

命名空间:

System.Windows.Annotations

程序集:

PresentationFramework.dll

返回一个 IAnchorInfo 对象，该对象提供有关指定批注的定位信息，如定位点位置。

public:
 static System::Windows::Annotations::IAnchorInfo ^ GetAnchorInfo(System::Windows::Annotations::AnnotationService ^ service, System::Windows::Annotations::Annotation ^ annotation);

public static System.Windows.Annotations.IAnchorInfo GetAnchorInfo (System.Windows.Annotations.AnnotationService service, System.Windows.Annotations.Annotation annotation);

static member GetAnchorInfo : System.Windows.Annotations.AnnotationService * System.Windows.Annotations.Annotation -> System.Windows.Annotations.IAnchorInfo

Public Shared Function GetAnchorInfo (service As AnnotationService, annotation As Annotation) As IAnchorInfo

参数

service

AnnotationService

要用于此操作的批注服务。

annotation

Annotation

要为其获取定位信息的批注。

返回

IAnchorInfo

一个 IAnchorInfo 对象，该对象提供有关指定批注的定位信息；如果无法解析指定的批注，则为 null。

示例

请考虑具有批注窗格的简单文档阅读器应用程序。 注释窗格可能是一个列表框，用于显示锚定到文档的批注列表的文本。 如果用户在列表框中选择一项，应用程序将显示相应的批注对象所锚定到的文档段落。

下面的示例演示如何实现充当注释窗格的此类列表框的事件处理程序。

void annotationsListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{

    Annotation comment = (sender as ListBox).SelectedItem as Annotation;
    if (comment != null)
    {
        // IAnchorInfo info;
        // service is an AnnotationService object
        // comment is an Annotation object
        info = AnnotationHelper.GetAnchorInfo(this.service, comment);
        TextAnchor resolvedAnchor = info.ResolvedAnchor as TextAnchor;
        TextPointer textPointer = (TextPointer)resolvedAnchor.BoundingStart;
        textPointer.Paragraph.BringIntoView();
    }
}

Private Sub annotationsListBox_SelectionChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)

    Dim comment As Annotation = TryCast((TryCast(sender, ListBox)).SelectedItem, Annotation)
    If comment IsNot Nothing Then
        ' service is an AnnotationService object
        ' comment is an Annotation object
        info = AnnotationHelper.GetAnchorInfo(Me.service, comment)
        Dim resolvedAnchor As TextAnchor = TryCast(info.ResolvedAnchor, TextAnchor)
        Dim textPointer As TextPointer = CType(resolvedAnchor.BoundingStart, TextPointer)
        textPointer.Paragraph.BringIntoView()
    End If
End Sub

另请参阅

• TextAnchor