How to Add Link Annotation to PDF using C#. For more information, please follow link: https://kb.conholdate.com/total/net/how-to-add-link-annotation-to-pdf-using-csharp

how-to-add-link-annotation-to-pdf-using-csharp.cs

using GroupDocs.Annotation;
using GroupDocs.Annotation.Models.AnnotationModels;
using GroupDocs.Annotation.Models;
using System;
using System.Collections.Generic;

namespace AddLinkAnnotationtoPDFUsingCSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Set License to avoid the limitations of Annotation library
            License lic = new License();
            lic.SetLicense(@"Conholdate.Annotator.lic");

            // Instantiate Annotator object with input PDF path
            using (Annotator annotator = new Annotator("input.pdf"))
            {
                LinkAnnotation link = new LinkAnnotation
                {
                    Url = "https://www.groupdocs.com/",
                    CreatedOn = DateTime.Now,
                    Message = "This is link annotation",
                    BackgroundColor = 65535,
                    PageNumber = 0,
                    Points = new List<Point>
                    {
                        new Point(80, 730), new Point(240, 730), new Point(80, 650), new Point(240, 650)
                    },
                    Replies = new List<Reply>
                    {
                        new Reply
                        {
                            Comment = "First comment",
                            RepliedOn = DateTime.Now
                        },
                        new Reply
                        {
                            Comment = "Second comment",
                            RepliedOn = DateTime.Now
                        }
                    }
                };
                // Add link annotation to PDF
                annotator.Add(link);
                // Save the PDF to disk
                annotator.Save("result.pdf");
            }
        }
    }
}