how navigate one page to another page in PDF file by using itextsharp c#?

Question

By using itextsharp c#, I have one PDF file. In that PDF file, we have 10 pages. In 1st page of PDF file, i want a hyperlink at bottom to navigate a particular page of PDF file. For example, In 1st page of PDF, i want a hyperlink at the bottom to go to 5th page. NOTE:- it not newly crated file. i want to apply already created file.

Answer 1

It was very easy to find this page. You have to use Anchor and give it a name. Then you reference it by using #name:

Anchor click = new Anchor("Click to go to Target");
click.Reference = "#target";
Paragraph p1 = new Paragraph();
p1.Add(click);
doc.Add(p1);

Paragraph p2 = new Paragraph();
p2.Add(new Chunk("\n\n\n\n\n\n\n\n"));
doc.Add(p2);

Anchor target = new Anchor("This is the Target");
target.Name = "target";
Paragraph p3 = new Paragraph();
p3.Add(target);
doc.Add(p3);

In your case: put such anchors on every page, make references to all of them on the first page.

Btw, did you know what

Often when you open a PDF file, your PDF Viewer application displays a tree-view of the structure of the document, with each branch or leaf acting as a link to the corresponding chapter or section. iTextSharp provides the functionality to generate this tree-view through its Chapter and Section classes.

This said you don't need to do anything, simply use Chapter and Section properly and you will have what you need.

Answer 2

Please take a look at the AddNavigation example. This is the Java version of what you need to do:

public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
    PdfReader reader = new PdfReader(src);
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
    PdfDestination d1 = new PdfDestination(PdfDestination.FIT);
    Rectangle rect = new Rectangle(0, 806, 595, 842);
    PdfAnnotation vijay = PdfAnnotation.createLink(stamper.getWriter(), rect, PdfAnnotation.HIGHLIGHT_INVERT, 10, d1);
    stamper.addAnnotation(vijay, 1);
    PdfDestination d2 = new PdfDestination(PdfDestination.FIT);
    PdfAnnotation krishna = PdfAnnotation.createLink(stamper.getWriter(), rect, PdfAnnotation.HIGHLIGHT_PUSH, 1, d2);
    stamper.addAnnotation(krishna, 10);
    stamper.close();
}

You want to navigate from page 1 to page 5 using iTextSharp. This means we have to make small adjustments:

First you need to create a PdfDestination:

PdfDestination d = new PdfDestination(PdfDestination.FIT);

The C# code is identical to the Java code.

Then you need to create a Rectangle. This is the area where people will be able to click:

Rectangle rect = new Rectangle(0, 806, 595, 842);

The C# code is identical to the Java code, but be aware that I am using harc-coded coordinates here. I have an existing document with A4 pages that are created in such a way that the lower-left corner of the page has the coordinate (0, 0). My coordinates correspond with the half-inch upper margin of the page.

Now we create a link annotation:

PdfAnnotation a = PdfAnnotation.CreateLink(stamper.Writer,
    rect, PdfAnnotation.HIGHLIGHT_PUSH, 5, d);

Do you notice the slight differences between C# and Java? The method CreateLink() starts with an upper case in C# and getWriter() doesn't exist in PdfStamper, you need the Writer property. In this case, I jump to page 5.

Finally, we add the annotation to the stamper:

stamper.AddAnnotation(a, 1);

Note that once again, I changed the lower case (Java) into an upper case (C#).

This creates a link from page 1 to page 5.

The full example creates a link from page 1 to page 10 and a link from page 10 to page 1. You can test it here: primes_links.pdf