using QuestPDF.Fluent;
using QuestPDF.Infrastructure;
using System;
using System.IO;
using System.Linq;

internal class Program
{
    static void Main(string[] args)
    {
        // Create a new PDF document
        using (var stream = new MemoryStream())
        {
            var document = new Document(stream);

            // Add each PDF document to the output document
            for (int i = 1; i < args.Length; i++)
            {
                var inputDocument = new Document(new FileStream(args[i], FileMode.Open));
                document.Append(inputDocument.GetContent());
            }

            // Save the output document
            document.Save();
            File.WriteAllBytes("merged.pdf", stream.ToArray());
        }
    }
}
using System;
using System.IO;
using System.Linq;
using QuestPDF.Fluent;
using QuestPDF.Infrastructure;

internal class Program
{
    static void MergePdfFiles(string[] filePaths, string outputPath)
    {
        // Create a new PDF document
        using (var stream = new MemoryStream())
        {
            var document = new Document(stream);

            // Add each PDF document to the output document
            for (int i = 0; i < filePaths.Length; i++)
            {
                var inputDocument = new Document(new FileStream(filePaths[i], FileMode.Open));
                document.Append(inputDocument.GetContent());
            }

            // Save the output document
            document.Save();
            File.WriteAllBytes(outputPath, stream.ToArray());
        }
    }

    static void Main(string[] args)
    {
        string[] filePaths = { "input1.pdf", "input2.pdf", "input3.pdf" };
        string outputPath = "merged.pdf";
        MergePdfFiles(filePaths, outputPath);
    }
}