C#文件操作大全

参考这个

http://www.cnblogs.com/wangshenhe/archive/2012/05/09/2490438.html

http://www.cnblogs.com/zcttxs/archive/2012/06/12/2546293.html

http://www.cnblogs.com/hlxs/archive/2011/05/18/2087974.html