PDFsharp & MigraDoc Foundation

Hi all,

I am trying to walk the annotations list per page in an existing pdf. I have tried various permutations of the following foreach loops in C#



Every variation recives an invalid cast error

Unable to cast object of type 'AnnotationsIterator' to type 'System.Collections.Generic.IEnumerator`1[PdfSharp.Pdf.PdfItem]'

I can get around this by walking the document internal looking for dictionaries that are /Annot /Link. but that looses page affinity.

any thoughts on how to get around this.

Bille

This is a bug introduced in v1.31:

• In v1.2, the PdfAnnotations class implemented IEnumerable, and the nested AnnotationsIterator class implemented IEnumerator;
• In v1.31, PdfAnnotations implements IEnumerable<PdfItem>, and the AnnotationsIterator implements IEnumerator<PdfAnnotation>;
• The v1.31 GetEnumerator method tries to cast the AnnontationsIterator instance to an IEnumerator<PdfItem>, which would only work in .NET 4.0;

Unfortunately, short of switching to v1.2, the only solution is to iterate by hand: