<p>I have a requirement to read and display the owner of a file (for audit purposes), and potentially changing it as well (this is secondary requirement). Are there any nice C# wrappers?</p>

<p>After a quick google, I found only <a href="http://web.archive.org/web/20061116233324/http://www.softinsight.com/bnoyes/PermaLink.aspx?guid=8edc9d4c-0f2c-4006-8186-a3697ebc7476" rel="noreferrer">the WMI solution</a> and a suggestion to PInvoke GetSecurityInfo</p>

No need to P/Invoke.
System.IO.File.GetAccessControl
will return a
FileSecurity
object, which has a
GetOwner
method.
Edit: Reading the owner is pretty simple, though it's a bit of a cumbersome API:
```
```
const string FILE = @"C:\test.txt";

var fs = File.GetAccessControl(FILE);

var sid = fs.GetOwner(typeof(SecurityIdentifier));
Console.WriteLine(sid); // SID

var ntAccount = sid.Translate(typeof(NTAccount));
Console.WriteLine(ntAccount); // DOMAIN\username
```
```
Setting the owner requires a call to SetAccessControl to save the changes. Also, you're still bound by the Windows rules of ownership - you can't assign ownership to another account. You can give take ownership perms, and they have to take ownership.
```
```
var ntAccount = new NTAccount("DOMAIN", "username");
fs.SetOwner(ntAccount);

try {
   File.SetAccessControl(FILE, fs);
} catch (InvalidOperationException ex) {
   Console.WriteLine("You cannot assign ownership to that user." +
    "Either you don't have TakeOwnership permissions, or it is not your user account."
   );
   throw;
}
```
```