InvalidOperationException on Directory.EnumerateFileSystemEntries()

[CyberSinh]

Hi,

If I run these commands under PowerShell:

$path = "\\Ds216j\sauvegardes\Documents" # it's a shared folder on a Synology NAS
[Alphaleonis.Win32.Filesystem.Directory]::GetFileSystemEntryInfo($path)
[Alphaleonis.Win32.Filesystem.Directory]::EnumerateFileSystemEntries($path)

I get the following output:

As you can see, the target folder is well identified as a directory by AlphaFS. However, if I try to enumerate the contents of this folder, I get an error "the target directrory is a file, not a directory".
Does anybody know why?

Thanks.

[Yomodo]

curious.. how about other unc/local paths?
It think that the problem is not the path itself (\\Ds216j\sauvegardes\Documents), but the
next folder or file that is returned by the enumeration. InvalidOperationException can point
to a cyclic operation.

[fwi98]

Ok . How can i see the "next folder or file returned" ? NAS logs or PC logs?
Some folder are OK , other not.
Thanks
Regards

[Yomodo]

Hm.. the only way I can think of is using the VS debugger.

[CyberSinh]

Hi Yomodo.
You will find attached the IntelliTrace file sent by the end user affected by this issue.
Hope you will find it useful to diagnoose the issue.
Thanks.

AlphaFS.itrace.zip

[CyberSinh]

Hi Yomodo. Was this iTrace file useful to you? Do you need more information?

[Yomodo]

Hi CyberSinh, thanks for this. Will analyze this in the next days.

[Yomodo]

Unfortunately, I only have access to VS 2015 Enterprise, loading the .Itrace throws a waring that I'm not able to view all the information.

However, the Exception is thrown here:

AlphaFS/AlphaFS/Filesystem/FindFileSystemEntryInfo.cs

Line 427 in 3e87fde

throw new DirectoryNotFoundException(string.Format(CultureInfo.InvariantCulture, "({0}) {1}", Win32Errors.ERROR_PATH_NOT_FOUND, string.Format(CultureInfo.InvariantCulture, Resources.Target_Directory_Is_A_File, regularPath)));

If you can place a breakpoint and run debug again, you should be able to see exactly what data win32FindData and regularPath contain. Hopefully this can tell us more.

[CyberSinh]

Hi Yomodo,
You will find below a screenshot of Visual Studio 2017 with the iTrace log file opened:

You can view the win32FindData variable data.

[Yomodo]

I think the fix is simple; could you change this line:

AlphaFS/AlphaFS/Filesystem/FindFileSystemEntryInfo.cs

Line 303 in 3e87fde

if (null != handle)

to: if (null != handle && lastError != Win32Errors.NO_ERROR)

[CyberSinh]

Thank you very much Yomodo!

[Yomodo]

It works? Cool!

[CyberSinh]

I will propose a modified version of AlphaFS to the user concerned by this issue to check if the patch works. I'll keep you informed.

[CyberSinh]

I'm sorry but the user concerned has told me that the patch does not work. The same error always occurs. Here is the new IntelliTrace log:
AlphaFS2.zip

[Yomodo]

I've made a new branch #441 based on the latest master. Could you test again with this?

[CyberSinh]

Everything works fine with this new branch. You can merge it. Thank you.

[CyberSinh]

Any timinig for a new maintenance nuget release?

[Yomodo]

Soon, I'll start preparing.