WPF

BitmapMetadata metaInfo;
Stream imageStream = null;
imageStream = new FileStream(imageUri.LocalPath, FileMode.Open,
                          FileAccess.Read, FileShare.ReadWrite);
string extension = System.IO.Path.GetExtension(imageUri.LocalPath);
BitmapSource bitmapSource = null;
switch (extension.ToLower())
{
    case ".jpg":
        JpegBitmapDecoder decoderJpg =
            new JpegBitmapDecoder(imageStream,
                                  BitmapCreateOptions.PreservePixelFormat,
                                  BitmapCacheOption.Default);
        bitmapSource = decoderJpg.Frames[0];
        break;

    case ".tif":
        TiffBitmapDecoder decoderTif =
            new TiffBitmapDecoder(imageStream,
                                  BitmapCreateOptions.PreservePixelFormat,
                                  BitmapCacheOption.Default);
        bitmapSource = decoderTif.Frames[0];
        break;

    default:
        break;
}

// This returns a valid BitmapMetadata reference from both decoders.
metaInfo = (BitmapMetadata)bitmapSource.Metadata;
if (metaInfo != null)
{
    if (metaInfo.ContainsQuery("/app1/ifd/exif/subifd:{uint=36867}"))
        // JPEG goes down this path.
        return metaInfo.GetQuery("/app1/ifd/exif/subifd:{uint=36867}");  
    else
        // TIFF goes down this path.
        return null;
}
else
{
    return null;
}