C# winform export to PDF

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I have created a small app to try and understand how to export Images to pdf. The code below exports but the PDF is blank.

I have 2 columns ID and Image.

C#

<pre>using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace TestImage
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }


        //browse image into pictureBox1 
        private void BtnBrowseImage_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "Choose Image(*.jpg;*.png;*.gif)|*.jpg;*.png;*.gif";

            if (ofd.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image = System.Drawing.Image.FromFile(ofd.FileName);
            }

        }

        //button add data to dataGridView		
        //insert image from pictureBox to dataGridView 		

        private void BtnAdd_Click(object sender, EventArgs e)
        {
            try
            {
                MemoryStream ms = new MemoryStream();
                pictureBox1.Image.Save(ms, pictureBox1.Image.RawFormat);
                byte[] img = ms.ToArray();
                dataGridView1.Rows.Add(textBoxId.Text, img);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //create a DataGridView Image Column										
            DataGridViewImageColumn dgvImage = new DataGridViewImageColumn();
            //set a header test to DataGridView Image Column										
            dgvImage.HeaderText = "Image";
            dgvImage.ImageLayout = DataGridViewImageCellLayout.Stretch;

            DataGridViewTextBoxColumn dgvId = new DataGridViewTextBoxColumn();
            dgvId.HeaderText = "Id";

            dataGridView1.Columns.Add(dgvId);
            dataGridView1.Columns.Add(dgvImage);

            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
            dataGridView1.RowTemplate.Height = 120;

            dataGridView1.AllowUserToAddRows = false;

        }

        private void btn_Export_Click(object sender, EventArgs e)
        {
            if (dataGridView1.Rows.Count > 0)
            {
                SaveFileDialog sfd = new SaveFileDialog();
                sfd.Filter = "PDF (*.pdf)|*.pdf";
                sfd.FileName = "Output.pdf";
                bool fileError = false;
                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    if (File.Exists(sfd.FileName))
                    {
                        try
                        {
                            File.Delete(sfd.FileName);
                        }
                        catch (IOException ex)
                        {
                            fileError = true;
                            MessageBox.Show("It wasn't possible to write the data to the disk." + ex.Message);
                        }
                    }
                    if (!fileError)
                    {
                        try
                        {
                            PdfPTable pdfTable = new PdfPTable(dataGridView1.Columns.Count);
                            pdfTable.DefaultCell.Padding = 3;
                            pdfTable.WidthPercentage = 100;
                            pdfTable.HorizontalAlignment = Element.ALIGN_LEFT;

                            foreach (DataGridViewColumn column in dataGridView1.Columns)
                            {
                                PdfPCell cell = new PdfPCell(new Phrase(column.HeaderText));
                                pdfTable.AddCell(cell);
                            }
                          

                            ////Option 2
                            foreach (DataGridViewRow row in dataGridView1.Rows)
                            {
                                string Id = row.Cells[0].Value.ToString(); 
                                // Now your image cell
                                byte[] imageByte = (byte[])row.Cells[1].Value;
                                iTextSharp.text.Image myImage = iTextSharp.text.Image.GetInstance(imageByte);
                                pdfTable.AddCell(myImage);

                            }
                          
                            //Stop Option 2
                          

                            using (FileStream stream = new FileStream(sfd.FileName, FileMode.Create))
                            {
                                Document pdfDoc = new Document(PageSize.A4, 10f, 20f, 20f, 10f);
                                PdfWriter.GetInstance(pdfDoc, stream);
                                pdfDoc.Open();
                                pdfDoc.Add(pdfTable);
                                pdfDoc.Close();
                                stream.Close();
                            }

                            MessageBox.Show("Data Exported Successfully !!!", "Info");
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show("Error :" + ex.Message);
                        }
                    }
                }
            }
            else
            {
                MessageBox.Show("No Record To Export !!!", "Info");
            }
        }
    }
}

What I have tried:

C#

////Option 1 
                            //foreach (DataGridViewRow row in dataGridView1.Rows)
                            //{
                            //    foreach (DataGridViewCell cell in row.Cells)
                            //    {
                            //        pdfTable.AddCell(cell.Value.ToString());

                            ////Stop Option 1

Posted 29-Apr-20 9:35am

Member 12349103

Updated 29-Apr-20 19:48pm

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Garth J Lancaster · Answer 1 · 2020-04-29T13:50:00

<disclaimer> It has been a while since I worked with iTextSharp

I think you need an extra step here

byte[] imageByte = (byte[])row.Cells[1].Value;
iTextSharp.text.Image myImage = iTextSharp.text.Image.GetInstance(imageByte);
pdfTable.AddCell(myImage);

If I were doing this from a file I'd do

iTextSharp.text.Image jpgImage = iTextSharp.text.Image.GetInstance("path/image-file.jpg");
PdfPCell imageCell = new PdfPCell(jpgImage);

// add the image cell
table.AddCell(imageCell);

(note the use of PdfPCell there)... so maybe in your case (I can't test it)

byte[] imageByte = (byte[])row.Cells[1].Value;
iTextSharp.text.Image myImage = iTextSharp.text.Image.GetInstance(imageByte);
PdfPCell imageCell = new PdfPCell(myImage);
pdfTable.AddCell(imageCell);

The PdfPCell iirc has Colspan, Border, and setHorizontalAlignment properties that can be used for alignment etc

[edit] my answer depends on the version of iTextSharp - you may also wish to check this link iText 7 : How to add an image and text to the same cell?[^] [/edit]

Maciej Los · Answer 2 · 2020-04-29T19:50:00

Solution 2

Another way is to use PrintDocument Class (System.Drawing.Printing) | Microsoft Docs[^] and then to print its content to pdf.
See: How to generate PDF from Print document | WinForms - PDF[^]

Posted 29-Apr-20 19:50pm

Maciej Los