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Add annotation and display in WPF Viewer - eschunk@deloitte.com
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ESchunk  
#1 Posted : Tuesday, August 13, 2019 10:16:13 AM(UTC)
ESchunk

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I'm trying to programmatically add a square annotation when a user clicks a button in a WPF app and have the annotation appear in the viewer. Is this possible?
The code in the button is listed below and is not working as the annotation does not appear after the button click. When is it necessary to call InvalidateVisual, ClearRenderBuffer and UpdateLayout?


if (page.Annots == null)
page.CreateAnnotations();


FS_RECTF rect = new FS_RECTF(left, top, right, bottom);
page.Annots.Add(new PdfSquareAnnotation(page, rect, FS_COLOR.Red, FS_COLOR.Green));

pdfViewer1.InvalidateVisual();
pdfViewer1.ClearRenderBuffer();
pdfViewer1.UpdateLayout();


Thanks,

Ted
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Paul Rayman  
#2 Posted : Tuesday, August 13, 2019 11:46:01 AM(UTC)
Paul Rayman

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Try to call page.Dispose instead of clear render buffer etc.
This will cause the page to reload and update all changes
Code:

...
page.Dispose();
pdfViewer1.InvalidateVisual();
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ESchunk  
#3 Posted : Tuesday, August 13, 2019 12:41:46 PM(UTC)
ESchunk

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Joined: 8/13/2019(UTC)
Posts: 12
United States
Location: New York
That worked. Thanks
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