Filesystemwatcher - How to catch the user who modified C#

Question

I developed an application that monitors events in filesystem using the class FileSystemWatcher and would like to leave installed on the file server happens that I need to register the user who accessed the file over the network.

Observing: locally know I can use:

System.Security.Principal.WindowsIdentity.GetCurrent().Name

or

ManagementObjectSearcher searcher = 
                 new ManagementObjectSearcher("SELECT UserName FROM Win32_ComputerSystem");
ManagementObjectCollection collection = searcher.Get();

and by the network?

Answer 1

In the title you say user you changed, but in the question you say the user you accessed.

If you want the user you accessed, you won’t be able to by the file properties. You will probably have to implement a file access control.

If you want the last user you changed, you will have difficulties when the user is from another domain.

If you are in the same domain, try the following code:

var usr = System.IO.File.GetAccessControl(path).GetOwner(typeof(System.Security.Principal.SecurityIdentifier));

or

var usr = System.IO.File.GetAccessControl(path).GetOwner(typeof(System.Security.Principal.NTAccount));