.NET FileInfo.LastWriteTime & FileInfo.LastAccessTime are wrong

Question

When I call FileInfo(path).LastAccessTime or FileInfo(path).LastWriteTime on a file that is in the process of being written it returns the time tha

Answer 1

Starting in Windows Vista, last access time is not updated by default. This is to improve file system performance. You can find details here:

http://blogs.technet.com/b/filecab/archive/2006/11/07/disabling-last-access-time-in-windows-vista-to-improve-ntfs-performance.aspx

To reenable last access time on the computer, you can run the following command:

fsutil behavior set disablelastaccess 0