Why 'part of path not found' error?

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Hi all,

I adapted a piece of code (recursive LINQ query) to generate a BindingList(of FileInfo) over a LAN. That works well on a local computer, and it seems to be fine on most of the remote network computers, too.

There seems to be a problem with the query, I guess, since I eventually get error message that "A part of the network path could not be found". This appears odd considering that the query reads paths first – and then can't find then...

(EDIT: I've checked that the path's throwing an error are existing and there's also no security issue with them. It must be something in the code)

In my strong believe that Alzheimer's wouldn't spread to Computers: Can someone please help me clear up the confusion as well as, if needed, correct the syntax?

Thank you very much,
Kind regards
Michael

What I have tried:

VB

Try
    For Each result As FileInfo In dirInfo.GetFiles(pattern).Select(Function(file) file).Where(Function(s) supportedExtensions.Contains(Path.GetExtension(s.Extension).ToLower()))
        queue.Enqueue(result)
        report(dirInfo.FullName)
    Next result
    Task.WaitAll(dirInfo.GetDirectories().Select(
     Function(d) Task.Factory.StartNew(
       Sub() InternalCollectFiles(d, pattern, queue))).ToArray())

Catch e As UnauthorizedAccessException
Catch e As SecurityException
Catch e As DirectoryNotFoundException
    MsgBox(String.Format("Error: {0}", e.Message))

Catch ex As Exception
    MsgBox(String.Format("Error in 'InternalCollectFiles': {0}", ex.Message))

End Try

Posted 4-Feb-19 0:38am

Sonhospa

Updated 4-Feb-19 22:07pm

v2

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Comments

F-ES Sitecore 4-Feb-19 7:01am

When the error occurs see what path it is trying to access. Either the path is wrong as there is a code issue, or the path is correct but can't be accessed due to a security issue. We don't have access to your system or your network so we can't check these things for you.

Maciej Los 4-Feb-19 7:07am

Do not repost: How to get only specific columns in this LINQ expression?[^]!

Sonhospa 4-Feb-19 7:09am

Did you read it? It's a completely different question, not a repost.

Maciej Los 4-Feb-19 7:17am

Yeah, i've read that twice. The only differ is that you did not mention (in your previous question) that above code generates such of error message...

Sonhospa 4-Feb-19 7:29am

1. Looking for approach to extend a LINQ query
2. Trying to resolve a DirectoryNotFoundException

Completely different tasks. Have a (more) beautiful day.

Maciej Los 4-Feb-19 7:55am

Don't be annoyed at me...
A common part of your questions (even if it's one to me) is your code, which is not working as you expect. Till you did not resolve issue with DirectoryNotFoundException, a part about extend Linq query is... less important. Am i wrong?

I'd suggest to re-write your qustion and provide more details about that what you're trying to achieve. It would be easier to understand how to help you.

Cheers!
Maciej

Sonhospa 4-Feb-19 8:37am

You are wrong. The error is thrown without any change of the LINQ query and surely not related to it's potential extra filtering (which was btw the first thread I opened). Surely two completely different answers, one on general LINQ syntax and one on my implementation of a recursive function.

'How would I apply an extension to my car' has a completely different scope than 'In some areas of the country my car stutters', doesn't it? And for sure different people would answer. It may be the same car though (not necessarily).

Now let's please finish this overly academic waste of time. I don't see how anyone would have fun in reposting, but decided to open two threads after observing that others get criticised for asking different questions on their code in the same thread, thus creating a confused thread in which nobody knows what's resolved now and what isn't.

Cheers.

CHill60 4-Feb-19 8:47am

Do the folders that are failing have spaces in their name(s)?

Sonhospa 4-Feb-19 9:58am

Yes, they do. But 90% of other folders, which work well, have spaces in their names as well.

CHill60 4-Feb-19 10:34am

Fair enough. I think Maciej has got it though

Maciej Los 4-Feb-19 9:28am

I'm pretty sure that the reason of above error is that the task has not finished yet.
See: Task Class (System.Threading.Tasks) | Microsoft Docs[^]
c# - Asynchronously Enumerate Folders - Stack Overflow[^]

Sonhospa 4-Feb-19 10:00am

This seems to make a lot of sense, as the tasks are running long. THANK YOU for the clue, I'll follow the links you supplied immediately!

Richard Deeming 4-Feb-19 10:11am

Another issue to bear in mind is that a lot of collection types are not thread-safe. Unless queue is one of the types from the System.Collections.Concurrent namespace, you could end up with some bizarre errors when you start manipulating it from multiple threads.

Maciej Los 4-Feb-19 12:21pm

Good point, Richard.

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Maciej Los · Answer 1 · 2019-02-04T22:07:00

Accordingly to the discussion in comments, there's few issues with your code, which may cause A part of the network path could not be found error. Conclusion is: you have to change a method you get files and folders information. Quite good explanation how to achieve that is here: c# - Asynchronously Enumerate Folders - Stack Overflow[^]

Additionally i'd suggest to read below articles too:
How to: Iterate File Directories with the Parallel Class | Microsoft Docs[^]
A Faster Directory Enumerator[^]
Enumerating Files and Directories in VB 2010[^]
c# - Improve the performance for enumerating files and folders using .NET - Stack Overflow[^]
c# - Get all files and directories in specific path fast - Stack Overflow[^]