ITextSharp open pdf at page index with zoom - visual-studio

Question

I've some pdf with a lot of sheets.
I made a serach in those files and I've a list with the page numers where the string is found.
Now I have to open those files to the exact page, perhaps with a zoom and a rectangle that shows the result.
Any idea?
P.S. The code I use for reading and open the pdf files is:
Dim reader As New PdfReader(FileToOpen)
Dim stamper As New PdfStamper(reader, New System.IO.FileStream("j:\Zoom.pdf", FileMode.Open, FileAccess.ReadWrite))
Dim pdfDest As New PdfDestination(PdfDestination.FITH)
Dim OA As PdfAction = PdfAction.GotoLocalPage(2, pdfDest, stamper.Writer)
stamper.Writer.SetOpenAction(OA)
stamper.Close()
reader.Close()

Answer 1

I almost closed this question as a duplicate of How to set initial view properties? because I found the question in the official iText documentation with a link to Stack Overflow: How to set initial view properties?
Of as a duplicate of How to set zoom level to pdf using iTextSharp? (see How to set the zoom level of a PDF using iTextSharp?)
However, I see that the answer on the official iText web site is better than the answer on Stack Overflow, because it combines everything you need to know.
In short: you need an open action:
//Create a destination that fit's width (fit horizontal)
var D = new PdfDestination(PdfDestination.FITH);
//Create an open action that points to a specific page using this destination
var OA = PdfAction.GotoLocalPage(1, D, stamper.Writer);
//Set the open action on the writer
stamper.Writer.SetOpenAction(OA);
Obviously, you can choose to create another destination when you define D.
If you are by any chance using iText 7, then you should read chapter 7 of the iText 7: Building Blocks tutorial to learn about the open action, and chapter 6 where all the possible destinations (XYZ, FitH, FitB,...) are explained.
Please read the documentation before posting a question.