Steps

Requirements

  1. Visual Studio Code (VS Code)
  2. Polyglot Notebook Extension

Create New File

  1. Basic Setup Knowledge
  2. Install .NET SDK If not Installed From Official Website

File Setup

  1. Install Visual Studio Code

    • If not already installed, download and install VS Code.

  2. Open the Folder with Your Image Files

    • Navigate to the folder where your image files are located.

  3. Open Terminal in the Folder

    • For Windows: Right-click in the folder, select “Show More Options,” and then “Open in Terminal.” Alternatively, type cmd in the folder path and press Enter.
    • In the terminal, type code . (code followed by a space and a period) to open VS Code in that folder.

    If the above methods don’t work, search for VS Code in your PC’s start menu and open it, then follow the live video for an alternative method:

  1. Create a New Folder and Copy Image Files

    • Create a new folder and copy all your image files into it.

  2. Create a New Polyglot Notebook File

    • Create a new file with a name ending in either .ipynb or .dib.
    • Open the newly created file, then click on Select Kernel on the top right side of the file and choose .NET Interactive.

Select Kernel

Library Installation Setup

Copy and paste the following code into the first cell of your notebook:

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#r "nuget: PdfSharp, 1.32.3057"
#r "nuget: System.Drawing.Common, 7.0.0"

Main Program Code

  1. Add a New Code Cell
    • Hover over the middle of the first cell until a “+ code” appears to add a new code cell. Click On Plus Code button

Add New Cell

  1. Copy and Paste the Main Program Code
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using System;
using System.Drawing;
using System.IO;
using PdfSharp.Drawing;
using PdfSharp.Pdf;

// Function to convert PNG files to a single PDF
void ConvertPngsToPdf(string imageDirectory, string outputPdfFilePath)
{
    if (!Directory.Exists(imageDirectory))
    {
        Console.WriteLine($"Error: Input directory '{imageDirectory}' does not exist.");
        return;
    }

    try
    {
        // Create a new PDF document
        PdfDocument pdfDocument = new PdfDocument();

        // Get all PNG files in the input directory
        string[] pngFiles = Directory.GetFiles(imageDirectory, "*.*");
        //string[] pngFiles = Directory.GetFiles(imageDirectory, "*.png"); // for specific file type

        // for ordering Un COmment Below
        //pngFiles = pngFiles.OrderBy(x=>x)

        foreach (string pngFilePath in pngFiles)
        {
            // Create a new PDF page
            PdfPage pdfPage = pdfDocument.AddPage();

            // Load the PNG image
            using (XImage xImage = XImage.FromFile(pngFilePath))
            {
                // Adjust the page size to the image size
                pdfPage.Width = xImage.PixelWidth * 72 / xImage.HorizontalResolution;
                pdfPage.Height = xImage.PixelHeight * 72 / xImage.VerticalResolution;

                // Draw the image on the PDF page
                using (XGraphics graphics = XGraphics.FromPdfPage(pdfPage))
                {
                    graphics.DrawImage(xImage, 0, 0, pdfPage.Width, pdfPage.Height);
                }
            }

            Console.WriteLine($"Successfully added {pngFilePath} to PDF.");
        }
        pdfDocument.Save(outputPdfFilePath); 
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error: {ex.Message}");
    }
}

// Define input and output paths
// replace below Path with Your Desired Path
string imageDirectory = @"C:\Users\Prashant\Desktop\Tutorials\PNGPDF\files";
string outputPdfFilePath = @"output.pdf";

// Call the function to convert PNGs to PDF
ConvertPngsToPdf(imageDirectory, outputPdfFilePath);

Code Modifications

You need to modify the code at line numbers 22 and 59:

  1. Line 22: Specify Image Format

    • Default Code:
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      string[] pngFiles = Directory.GetFiles(imageDirectory, "*.*");
    • Modified Code (for PNG files):
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      string[] pngFiles = Directory.GetFiles(imageDirectory, "*.png");

  2. Line 59: Specify Image Folder Path

    • Replace the placeholder with your actual image folder path:
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      string imageDirectory = @"replace me with image Folder path";

Run the Program

  • Click on the Run All button at the top of the screen.

Run All

After running the program, you should find a PDF file generated in your current directory.

Live Demo of Code