Create Image Thumbnails in C#

The code snippet and project attached in this article demonstrates how to create a control that displays thumbnails of images using GDI+ and C#.

The code for Browse Multiple Files button click event handler looks like following that let users select multiple images and show their thumbnails. Download the attached project for more details. The application looks like this:

It is is a Windows Forms application developed using Visual Studio 2010.

private void BrowseMultipleButton_Click(object sender, EventArgs e)

{

        this.openFileDialog1.Filter =

        "Images (*.BMP;*.JPG;*.GIF,*.PNG,*.TIFF)|*.BMP;*.JPG;*.GIF;*.PNG;*.TIFF|" +

        "All files (*.*)|*.*";

 

    this.openFileDialog1.Multiselect = true;

    this.openFileDialog1.Title = "Select Photos";

 

        DialogResult dr = this.openFileDialog1.ShowDialog();

        if (dr == System.Windows.Forms.DialogResult.OK)

        {

            foreach (String file in openFileDialog1.FileNames)

            {

                try

                {

                    PictureBox imageControl = new PictureBox();

                    imageControl.Height = 100;

                    imageControl.Width = 100;

 

                    Image.GetThumbnailImageAbort myCallback =

                            new Image.GetThumbnailImageAbort(ThumbnailCallback);

                    Bitmap myBitmap = new Bitmap(file);

                    Image myThumbnail = myBitmap.GetThumbnailImage(96, 96,

                        myCallback, IntPtr.Zero);

                    imageControl.Image = myThumbnail;

 

                    PhotoGallary.Controls.Add(imageControl);

                }

                catch (Exception ex)

                {

                    MessageBox.Show("Error: " + ex.Message);

                }

            }

        }

}

 

public bool ThumbnailCallback()

{

    return false;

}