C# DirectoryInfo Exceptions on folders...

StickyMcGinty

hopefully i'll get my problem across lads its been one of those days....

I've implemented a breadth-first search algorithm in C# as part of a simple (enough) search window in my program. Basically folders are only added to the Queue if they pass this folder check:

if (!((dir.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden)
&& !((dir.Attributes & FileAttributes.System) == FileAttributes.System) )

I keep getting an UnauthorizedAccessException on the code below, specifically when i try to get the DirectoryInfo array from the directory.

string searchPath = myQueue.Dequeue(); // only added to the Q if the folder
                                                        //passes the above check (not 
                                                        //a system or hidden folder)

DirectoryInfo dirInf = new DirectoryInfo(searchPath); // Exception thrown
                                                                        // here
DirectoryInfo[] dirArray = dirInf.GetDirectories();

In the catch block i've got Exception.Message.ToString() popping up in a messageBox and its telling me:

"Access Denied to :"
C:\Windows\System32\LogFiles\WMI\RtBackup

Now i know these are folders that i dont have permission to go rooting around in, but is there any way i can skip these folders?

I thought checking if they were "system" or "hidden" files would be enough, i've tried "FileAttributes.NotContentIndexed" as a check aswell, but i still get the exception.

Any suggestions appreciated...

JazzyJ

You've only checked if the folder is not hidden and not a system folder.

You'll also need to check if the user running the application has permission to access the folder. The System.Security.Permissions.FileIOPermission class should get you on your way:

http://msdn2.microsoft.com/en-us/library/system.security.permissions.fileiopermission.aspx

Ginger

What he said! My original post was a bit more convuted

StickyMcGinty

JazzyJ wrote: »

You've only checked if the folder is not hidden and not a system folder.

You'll also need to check if the user running the application has permission to access the folder. The System.Security.Permissions.FileIOPermission class should get you on your way:

http://msdn2.microsoft.com/en-us/library/system.security.permissions.fileiopermission.aspx

Thanks for the link, but i'm still stuck on this.

As far as i can see the FileIOPermission is only used to Demand or Deny rights? am i miles off here?

I've tried to use the DirectorySecurity class to get the AccessControlList for the directory, but so far i cant seem to pull the right attributes from it to determine if I can access it