VintaSoft Annotation .NET Plug-in Discussions

I'm saving the current annotation data to an object, and restoring it at a later date. But sometimes the outline is disappearing, it is part of the object when I save it but, but when I restore it, it's sometimes null. Any idea why this might be happening?

Thanks for any help,

Saving

public void AnnotationsChanged(AnnotationDataController annotationDataController)
{
    this._annotationDatas = new List<AnnotationDataCollection>();

    for (int i = 0; i < annotationDataController.Images.Count; i++)
    {
        AnnotationDataCollection annotatonDataCollection = annotationDataController.GetAnnotations(i);
        this._annotationDatas.Add((AnnotationDataCollection)annotatonDataCollection.Clone());
    }
}

Restoring

private void LoadAnnotationsFromDisk()
{
    try
    {
        if (DataManager.Instance.AnnotationDatas != null && DataManager.Instance.AnnotationDatas.Count > this.annotationViewer.FocusedIndex)
        {
            if (DataManager.Instance.AnnotationDatas[this.annotationViewer.FocusedIndex].Count > 0)
            {
                foreach(AnnotationData annotationData in DataManager.Instance.AnnotationDatas[this.annotationViewer.FocusedIndex])
                {
                    try
                    {
                        if (!this.annotationViewer.AnnotationDataCollection.Contains(annotationData))
                            this.annotationViewer.AnnotationDataCollection.Add(annotationData);
                    }
                    catch(Exception ex)
                    { }
                }
            }
        }
    }
    catch (Exception ex)
    { }
}

I'm actually not saving the annotation to a file (it's a poorly named method). I'm just saving it in memory, changing the image collection on the viewer, then changing it back to the original image collection and restoring the annotations from the AnnotationDataCollection. Somewhere in that, the outline is disappearing, all other properties are still there.

Hello,

Thank you for sample project, we reproduced the problem.

When you adding annotation to the annotation collection of annotation viewer, annotation viewer takes control over annotation.
When you closing images in annotation viewer, annotation viewer disposes images and annotations.
Disposed annotation does not have Outline.

For solving the problem you need to clone annotation before adding it to the annotation collection of annotation viewer.

Please change code:

if (!this.annotationViewer1.AnnotationDataCollection.Contains(annotationData) && annotationData.Outline != null)
В  В this.annotationViewer1.AnnotationDataCollection.Add(annotationData);

to the following code:

this.annotationViewer1.AnnotationDataCollection.Add((AnnotationData)annotationData.Clone());

Best regards, Alexander