按字节地复制文件

FileStream srcfile = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);

FileStream desfile = new FileStream(path2, FileMode.Create, FileAccess.Write, FileShare.Write);

int Length = (int) srcfile.Length;

byte[] arrBytes = new byte [Length];

srcfile.Read(arrBytes, 0 , Length);

desfile.Write(arrBytes, 0 , Length);