public ExifData(string filename)
{
var exif = new ExifInterface(filename);
_rawData = new Dictionary <string, object>
{
{ ExifInterface.TagAperture, exif.GetAttributeDouble(ExifInterface.TagAperture, 1) },
{ ExifInterface.TagDatetime, exif.GetAttribute(ExifInterface.TagDatetime) },
{ ExifInterface.TagExposureTime, exif.GetAttribute(ExifInterface.TagExposureTime) },
{ ExifInterface.TagFlash, exif.GetAttribute(ExifInterface.TagFlash) },
{ ExifInterface.TagFocalLength, exif.GetAttributeDouble(ExifInterface.TagFocalLength, 0) },
{ ExifInterface.TagGpsAltitude, exif.GetAttribute(ExifInterface.TagGpsAltitude) },
{ ExifInterface.TagGpsAltitudeRef, exif.GetAttribute(ExifInterface.TagGpsAltitudeRef) },
{ ExifInterface.TagGpsDatestamp, exif.GetAttribute(ExifInterface.TagGpsDatestamp) },
{ ExifInterface.TagGpsLatitude, exif.GetAttribute(ExifInterface.TagGpsLatitude) },
{ ExifInterface.TagGpsLatitudeRef, exif.GetAttribute(ExifInterface.TagGpsLatitudeRef) },
{ ExifInterface.TagGpsLongitude, exif.GetAttribute(ExifInterface.TagGpsLongitude) },
{ ExifInterface.TagGpsLongitudeRef, exif.GetAttribute(ExifInterface.TagGpsLongitudeRef) },
{ ExifInterface.TagGpsProcessingMethod, exif.GetAttribute(ExifInterface.TagGpsProcessingMethod) },
{ ExifInterface.TagGpsTimestamp, exif.GetAttribute(ExifInterface.TagGpsTimestamp) },
{ ExifInterface.TagImageLength, exif.GetAttribute(ExifInterface.TagImageLength) },
{ ExifInterface.TagImageWidth, exif.GetAttribute(ExifInterface.TagImageWidth) },
{ ExifInterface.TagIso, exif.GetAttribute(ExifInterface.TagIso) },
{ ExifInterface.TagMake, exif.GetAttribute(ExifInterface.TagMake) },
{ ExifInterface.TagModel, exif.GetAttribute(ExifInterface.TagModel) },
{ ExifInterface.TagOrientation, exif.GetAttributeInt(ExifInterface.TagOrientation, -1) },
{ ExifInterface.TagWhiteBalance, exif.GetAttributeInt(ExifInterface.TagWhiteBalance, 0) },
};
}