How to Add 'Comments' to a JPEG File Using C#

Question

Within the property window of a JPEG image, there is a tab called \'Summary\'. Within this tab, there is a field called \'Comments\' I would like to write some c# code which

Answer 1

Thanks to the answers here, I've coded a solution to set a comment using memory only:

public static Image SetImageComment(Image image, string comment) {
  using (var memStream = new MemoryStream()) {
    image.Save(memStream, ImageFormat.Jpeg);
    memStream.Position = 0;
    var decoder = new JpegBitmapDecoder(memStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
    BitmapMetadata metadata;
    if (decoder.Metadata == null) {
      metadata = new BitmapMetadata("jpg");
    } else {
      metadata = decoder.Metadata;
    }

    metadata.Comment = comment;

    var bitmapFrame = decoder.Frames[0];
    BitmapEncoder encoder = new JpegBitmapEncoder();
    encoder.Frames.Add(BitmapFrame.Create(bitmapFrame, bitmapFrame.Thumbnail, metadata, bitmapFrame.ColorContexts));

    var imageStream = new MemoryStream();
    encoder.Save(imageStream);
    imageStream.Position = 0;
    image.Dispose();
    image = null;
    return Image.FromStream(imageStream);
  }
}

Don't forget to dispose the image that is returned by this method. (For example after saving the image to a file)