http://sourceforge.net/projects/openexif/
OpenExif is an object-oriented library for accessing Exif formated JPEG image files. The toolkit allows creating, reading, and modifying the metadata in the Exif file. It also provides means of getting and setting the main image and the thumbnail image.
http://sourceforge.net/projects/exifmdreader/
Full C# assembly to read EXIF metadata from JFIF and EXIF structured jpeg image files. It also extracts the MakerNote information and don't use the .Net Image and Bitmap classes but its own parser, thus avoiding performance issues.
Exif是英文Exchangeable Image File(可交换图像文件)的缩写,最初由日本电子工业发展协会(JEIDA --Japan Electronic Industry Development Association) 制订,目前的最新版本是2.21 版。国际标准化组织(ISO)正在制订的相机文件设计标准(DCF -- Design role for Camera File system)可能以Exif2.1为基础。