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Some Properties not loaded in pdfviewer PdfLoadedDocument

Dear,

I have two questions: 1) loading properties; 2) modify properties for pdf with a lot of pages.

we are using pdfviewer control inside a WPF app. 


1) When we try to extract the following properties from a loaded PDF file within pdfviewer, we don't get what we expect, some properties were lost. 

For example: when we looping annotations from 

     PdfLoadedDocument=> PdfPageBase[x]=> Annotations from PdfViewerControl


below properties not correctly loaded:

a) PdfFreeTextAnnotation.Font(Name,Bold,Style...)

b) PdfFreeTextAnnotation.AnnotationIntent

c) PdfFreeTextAnnotation.ModifiedDate

d) PdfFreeTextAnnotation.AnnotationFlags


2) Another issue we encounter, is that we can't modify the properties of all pages inside a pdf file. Only properties on the first couple of pages are correctly modified.


See sample codes in attachment. 

Could you help checking what might go wrong with our codes? 


Thanks, John