C#: Retrieve JPEG Comment (not Exif)

I've been stumped trying to figure this one out.

I'm trying to retrieve the "Jpeg Comment" out of a jpg file via C#. The code below works but I need the basic comment NOT the Exif comment. I'm using FastStone Image Viewer to set the basic comment. Help me retrieve it.

I can use the commandline program exiv2 to verify that the comment is there. exiv2 -pc c:\t开发者_如何学Goest.jpg (it spits out the basic comment). exiv2 -pa c:\test.jpg (it spits out the EXIF comment) I've used several C# libs to get at it but they get the EXIF data.

        Image x = Image.FromFile(@"c:\test.jpg");
        PropertyItem prop;
        prop = x.GetPropertyItem(0x9286);
        string Comment = Encoding.ASCII.GetString(prop.Value); 

You could refer to this link.

(Thanks for those who already have answered the same question, although the answer was quite right but not 100% to solve this problem.)

Here are three steps you need to do:

1. Be aware that you should have the Jpeg file cloned.
2. Set the comment of the cloned file.
3. Replace the file by deleting the original jpeg file.

Here is the sample code:

    public void addImageComment(string imageFlePath, string comments)
    {
        BitmapDecoder decoder = null;
        BitmapFrame bitmapFrame = null;
        BitmapMetadata metadata = null;
        FileInfo originalImage = new FileInfo(imageFlePath);

        if (File.Exists(imageFlePath))
        {
            // load the jpg file with a JpegBitmapDecoder    
            using (Stream jpegStreamIn = File.Open(imageFlePath, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
            {
                decoder = new JpegBitmapDecoder(jpegStreamIn, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
            }

            bitmapFrame = decoder.Frames[0];
            metadata = (BitmapMetadata)bitmapFrame.Metadata;

            if (bitmapFrame != null)
            {
                BitmapMetadata metaData = (BitmapMetadata)bitmapFrame.Metadata.Clone();

                if (metaData != null)
                {
                    // modify the metadata   
                    metaData.Comment = comments;

                    // get an encoder to create a new jpg file with the new metadata.      
                    JpegBitmapEncoder encoder = new JpegBitmapEncoder();
                    encoder.Frames.Add(BitmapFrame.Create(bitmapFrame, bitmapFrame.Thumbnail, metaData, bitmapFrame.ColorContexts));
                    //string jpegNewFileName = Path.Combine(jpegDirectory, "JpegTemp.jpg");

                    // Delete the original
                    originalImage.Delete();

                    // Save the new image 
                    using (Stream jpegStreamOut = File.Open(imageFlePath, FileMode.CreateNew, FileAccess.ReadWrite))
                    {
                        encoder.Save(jpegStreamOut);
                    }
                }
            }
        }
    }

You can do this quite simply with the MetadataExtractor library (available via NuGet):

JpegCommentDirectory jpegCommentDirectory = ImageMetadataReader.ReadMetadata(imagePath)
     .OfType<JpegCommentDirectory>()
     .FirstOrDefault();

string comment = jpegCommentDirectory?.GetDescription(JpegCommentDirectory.TagComment);