AnnotationHelper.GetAnchorInfo Method

Returns an IAnchorInfo object that provides anchoring information, such as the anchor location, about the specified annotation.

Namespace:  System.Windows.Annotations
Assembly:  PresentationFramework (in PresentationFramework.dll)

public static IAnchorInfo GetAnchorInfo(
	AnnotationService service,
	Annotation annotation
)

Parameters

service
Type: System.Windows.Annotations.AnnotationService
The annotation service to use for this operation.
annotation
Type: System.Windows.Annotations.Annotation
The annotation to get anchoring information for.

Return Value

Type: System.Windows.Annotations.IAnchorInfo
An IAnchorInfo object that provides anchoring information about the specified annotation, or null if it cannot be resolved.

GetAnchorInfo is introduced in the Microsoft .NET Framework version 3.5. For more information, see .NET Framework Versions and Dependencies.

Consider a simple document reader application that has a comments pane. The comments pane might be a list box that displays the text from a list of annotations that are anchored to a document. If the user selects an item in the list box, then the application brings into view the paragraph in the document that the corresponding annotation object is anchored to.

The following example demonstrates how to implement the event handler of such a list box that serves as the comments pane.


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();
    }
}


.NET Framework

Supported in: 4, 3.5 SP1, 3.0 SP1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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