Metadata from image is deleted on reading it?

Question

My TelegramBot receives an image and stores it somewhere, the name of the created file is the date and time the image was taken (f.e. 2018-07-13_13-18-55.jpg)

I get this information from the metadata of the image with the following code:

 private static string Date_taken(Image image, MessageEventArgs e, int messageId)
    {
        try
        {
            var propItem = image.GetPropertyItem(36867);
            var originalDateString = Encoding.UTF8.GetString(propItem.Value);
            originalDateString = originalDateString.Remove(originalDateString.Length - 1);
            return originalDateString.Replace(":", "-").Replace(" ", "_");
        }
        catch
        {
            Trace.WriteLine(NowLog + " " + MessageIDformat(messageId) + " " + Resources.TelegramBot_Date_taken_no_capturetime + " " + e.Message.Chat.Username);
            return DateTime.Today.ToString("yyyy-MM-dd") + "_" + DateTime.Now.ToString("HH-mm-ss", System.Globalization.DateTimeFormatInfo.InvariantInfo) + "_noCaptureTime";
        }
    }

The picture is named correctly, BUT the metadata is somehow lost in this process (only date and time when the image was taken).

The only thing I do with the picture in addition to the above code is saving it:

private static string Save_image(MessageEventArgs e, Image image, int messageId)
    {
        Bitmap finalImage;
        var hasCompression = HasCompression(e.Message.Chat.Username);
        var res = (double)image.Width / image.Height;
        int width = image.Width,
            height = image.Height;
        var dateTaken = Date_taken(image, e, messageId);

        if(res <= 1)
        {
            //Portrait
            height = hasCompression ? MaxLen : height;
            width = hasCompression ? Convert.ToInt16(height * res): width;
        }
        else
        {
            //Landscape
            width = hasCompression ? MaxLen : width;
            height = hasCompression ? Convert.ToInt16(width / res): height;
        }

        if (image.Width > width && image.Height > height)
            finalImage = ResizeImg(image, width, height);
        else
            finalImage = ResizeImg(image, image.Width, image.Height);

        var jpgEncoder = GetEncoder(ImageFormat.Jpeg);
        var myEncoder = System.Drawing.Imaging.Encoder.Quality;
        var encoder = new EncoderParameters(1);
        var encoderParameter = new EncoderParameter(myEncoder, hasCompression ? EncodeQ : 93L);
        encoder.Param[0] = encoderParameter;

        if (!File.Exists(PathPhotos + e.Message.Chat.Username + @"\" + dateTaken + ".jpg"))
        {
            finalImage.Save(PathPhotos + e.Message.Chat.Username + @"\" + dateTaken + ".jpg", jpgEncoder, encoder);
            return dateTaken + ".jpg";
        }
        else if (!File.Exists(PathPhotos + e.Message.Chat.Username + @"\" + dateTaken + " (2)" + ".jpg"))
        {
            finalImage.Save(PathPhotos + e.Message.Chat.Username + @"\" + dateTaken + " (2)" + ".jpg", jpgEncoder, encoder);
            return dateTaken + " (2)" + ".jpg";
        }
        else
        {
            var path = PathPhotos + e.Message.Chat.Username + @"\";
            var dir = new DirectoryInfo(path);
            var number = 0;

            foreach (var file in dir.GetFiles("*" + ".jpg"))
            {
                int test;
                try
                {
                    var pFrom = file.ToString().IndexOf("(") + "(".Length;
                    var pTo = file.ToString().LastIndexOf(")");

                    test = Convert.ToInt16(file.ToString().Substring(pFrom, pTo - pFrom));
                }
                catch (Exception)
                {
                    test = 0;
                }

                if (number < test)
                    number = test;
            }
            number++;
            finalImage.Save(PathPhotos + e.Message.Chat.Username + @"\" + dateTaken + " (" + number + ")" + ".jpg", jpgEncoder, encoder);
            return dateTaken + " (" + number + ")" + ".jpg";
        }

Could it be that the jpg encoder deletes the metadata?

Answer 1

With the help of @Anton Tykhyy comment, I could solve this.

if(image != 0)
{
    finalImage.SetPropertyItem(GetDateTakenFromImage(image));
}

GetDateTakenFromImage method:

public static PropertyItem GetDateTakenFromImage(Image image)
    {
        try
        {
            return image.GetPropertyItem(36867);
        }
        catch
        {
            return null;
        }
    }