Comments by Sonhospa - CodeProject

Sonhospa 27-Aug-23 16:44pm View

Thank you, Dave, for exposing my "blind spot" to me. After conversion to VB (which I can just read better) it starts making much more sense now, and I'm confident to get it working as soon as I find the time. Have a good day!

Sonhospa 26-Aug-23 12:02pm View

Deleted

Because I've been a member here, the post is from early 2019 and in C#. But your kind of help is of course inspiringly rude. Thank you for letting me learn.

Sonhospa 6-Aug-23 3:49am View

I just had a brief look at your extension method and it seems quite complicated. As mentioned, I had managed to change your first suggestion to "stepwise UI reporting" with a simple loop from a Microsoft example (cool that the HTML works in this window, too):

Private Async Function RunTest() As Task

        Dim files As List(Of String) = Directory.GetFiles(Environment.CurrentDirectory).ToList()
        Dim Infos = files.Select(Function(file) New FileInfo(file))

        Dim tasks = Infos.Select(Function(fileInfo) ProcessFileAsync(fileInfo)).ToList

        While tasks.Count > 0
            Dim finishedTask As Task(Of FileInfo) = Await Task.WhenAny(tasks)
            ' ***Remove the selected task from the list so that you don't process it more than once.  
            tasks.Remove(finishedTask)
            ' ***Await the first completed task and display the results.  
            Dim result = Await finishedTask
            Console.WriteLine($"{vbCrLf}Result:  {result}{vbCrLf}")
            Console.WriteLine($"> {finishedTask.Result.Name} ist fertig!")
        End While

        Dim results = Await Task.WhenAll(tasks)
        Console.WriteLine($"> Alle Tasks sind fertig!")

    End Function

Or do you see anything 'odd' in that approach? Gotta mention that speed is critical so that the change to .NET Core may help more than anything else.

Sonhospa 6-Aug-23 3:40am View

Wow, Graeme - thank you! I'm in the process of moving to .NET Core (here in Germany that's a bit more difficult coz I have to upgrade Win7 to Win10 first), so right now I can only thank you without even trying to digest your challenge... it's a lot of stuff you're using that I've not even tried to understand before (e.g. ".Getawaiter.Getresult" or "Predicate of") and which will surely require a few days. Have a good rest of the weekend!

Sonhospa 5-Aug-23 9:34am View

Thank you ever so much – what a pity that 5 stars is max and I hope you don't mind ;-)

As mentioned I'm happy with your initial "wrap the linq" solution, but higly appreciate your additional suggestions, hoping I can recall them once needed (eventually, as I'm not a pro)! Meanwhile I've (successfully) played around with your 'RunTest' example, changed it to reporting each finished task (incrementally reducing the list of tasks) plus giving a final message once all are completed. Looks good and is fun ;-)

I hope you're having a good movie time with your wife!
Kind regards from rainy Munich (I'm currently in Germany).

Sonhospa 5-Aug-23 7:22am View

Thanks again! Trusting your hint ('faster apps...') I might consider switching, too.

I'm only kinda 'leisure time programmer' and mostly require a GUI (WinForms), thus tried to avoid filling more of my leisure time with too much new learning topics. Up to now ;-)

Sonhospa 5-Aug-23 6:54am View

What a nice surprise – despite of having a working solution already, I'll surely use your suggestion at least for my learning and (hopefully) comprehension! Unfortunately, after getting the wrapping straight, I have a compiler error: "ReadAllBytesAsync is not a member of File". Is it probably a method from NET.Core that's missing in the Framework (4.7.2)?

UPDATE: After testing it I answer my own question "Yes!". In a new Testproject based on .NET Console Template (not .NET Framework!) your sample worked immediately with similar results.

In appreciation of your highly welcome effort (your update incl. example) I want to add a 5th star in my rating, and I hope it helps you (don't know how this works here). Have a nice day!

Sonhospa 5-Aug-23 5:41am View

Wrapping the call did it (I'll still read up a bit more on async File methods)! The only relevant line to change was

Dim tasks = txtLists.Select(Function(x) Task.Run(Function() TestForLTO_async(x)))

Thank you, Graeme – marking the solution as accepted now!

Sonhospa 25-Jul-23 5:09am View

EDIT: I'm sorry I had to walk back... was a bit too euphoric when the first breakpoint was reached. I've put in your suggestions and get a runtime error in the "Return totalEntries" line now. (German System, I hope that works for you):
Das Objekt des Typs "<selectmanyiterator>d__17`2[System.Threading.Tasks.Task`1[System.Collections.Generic.IEnumerable`1[System.String]],System.String]" kann nicht in Typ "System.Threading.Tasks.Task`1[System.Collections.Generic.IEnumerable`1[System.String]]" umgewandelt werden.

It's extremely confusing and overwhelming for me. As mentioned, I'm not very experienced.

EDIT: I've changed that last line to "Return Task.FromResult(totalEntries) and this seems to do it now! So again: THANK YOU VERY MUCH!

Sonhospa 25-Jul-23 2:42am View

Deleted

First: Good morning from the UK!
How would I get the result properties of all these tasks in LINQ and concatenate those together? Searching Google for hours and trying plenty of the suggested approaches (mostly given for different (syntax-) problems) was the reason why I "asked an expert" here in the first place.

Dim entriesTaskResults = entriesTasksQuery.Result leads to a compiler error:
"'result' is not a member of IEnumberable(Of Task(Of Ienumerable(Of String)))"

Sonhospa 25-Jul-23 2:42am View

First: Good morning from the UK!

How would I get the result properties of all these tasks in LINQ and concatenate those together? Searching Google for hours and trying plenty of the suggested approaches (mostly given for different (syntax-) problems) was the reason why I gave up and "asked an expert" here in the first place.

Dim entriesTaskResults = entriesTasksQuery.Result leads to a compiler error:
"'result' is not a member of IEnumberable(Of Task(Of Ienumerable(Of String)))"

Sonhospa 23-Jul-23 12:59pm View

Thank you ever so much, and sleep well!

FYI: I found the setting for CLR-exceptions (on my German system the names are different) and checked it (it was unchecked) but no exception thrown either. I'll try your approach now and let you know THAT (not if ;-)) it worked for me as well!

UPDATE: First "Good morning and have a lovely day!" :-)
OK, in order to come up with my promise I want to tell you that it did indeed work for me – just as long as it was a separate test project ;-). Thus, settings or other stuff that might differ on our systems wouldn't have hurt. Adapting my own project accordingly (and carefully) unfortunately didn't work out, probably I forgot any changes made in the other classes or whatever. After quite a while, I decided to scrap it and re-install a backup of a well-tested version (i.e. without forgotten code changes) that I had made yesterday. I also had the idea of a simpler overall approach that would give me the required results as well, just in a less "elegant" way. I.e. making me less proud of myself, but still effective.

Thank you, though, for your time and effort! It was really kind of you and also helped me a lot in my learning. Despite your cool workaround I want to report to you that, in the test-project I also tried the older While-Loop using 'Task.WhenAny' as in the Microsoft example, and I got exactly the same results as you did. As I mentioned before: It must have been any other mad change I made in my code without being aware – my bad but I'm good now. It's about time to sleep here in the UK as well now. Thanks again!

Sonhospa 23-Jul-23 12:01pm View

Just searching... usually I'm getting exceptions, but I'll check explicitly.
Edit: Sorry, having a quick visitor so a little delay until I can go on...

Sonhospa 23-Jul-23 11:51am View

Thank you for having a look. Sorry if you found it unclear, I thought I mentioned that it's Microsoft's example code (which I linked) and that all threads end with Code 0 (which is "no error", right?) – there was no thread exception, the code just silently returns to the UI and does nothing.

Unfortunately, your rewrite leads to exactly the same result. I reckoned that the first line (entriesTasksQuery) might be flawed, but since you put it in the same way I'm now even more clueless. Do you probsably have another idea how to find my error(s) in this?

Sonhospa 11-Mar-21 14:20pm View

It's how I named the TabControl. Admittedly, this might be confusing :-)

Sonhospa 11-Mar-21 13:54pm View

Hi again, Ralf,
it seems I was able to RESOLVE it "by accident", too :-) In a systematic approach I deactivated large parts of my code (set as comment) and uncommented parts stepwise. I now have a few lines left that I didn't find suspicious before, but they seem to have caused the problem!

It seems that my tabSelector.SelectedIndexChanged handler confused not only me but also the compiler:

Dim ctrl As TabControl = DirectCast(sender, TabControl)
Dim page As TabPage = ctrl.TabPages(ctrl.SelectedIndex)

If ctrl.SelectedIndex = 0 Then
'Stop
End If

Despite of the fact that the handler was actually doing nothing ("Stop" was also set as comment before), after deleting all of these statements I have my UI back as before!

Thank you, though, for trying to help – and have a nice evening!

Sonhospa 11-Mar-21 13:19pm View

Thank you for your response, Ralf. No I haven't used the dock property and I guess this would also show at design time. The form designer looks just as it should, and nothing in my code relocates any controls (purposely). The 'many changes' mainly involved read-/write methods etc, nothing I would relate with how the tabs are shown.

In one experiment I tried to select Tab3 at startup (if a condition has been matched), but deleted this piece of code shortly afterwards. Too sad I can't post a screenshot here in order to show what's presented.

BTW I'm using VS2019 Community on a Windows7 (64bit) system.

Sonhospa 4-Sep-20 17:31pm View

Thank you for your help and the idea, and have a nice weekend!

Sonhospa 3-Sep-20 14:42pm View

Sorry that I have to ask you again... I still didn't manage to make it work. The method is called in a click-Handler like this, which should put it on a background thread:
Dim t As Task = Task.Run(Sub()
msg = MethodName(Path, "*.*", System.IO.SearchOption.AllDirectories)
End Sub)
t.Wait()

I've set a breakpoint at the "progbar.value = " line and observed that it's not reached for every file but in somewhat arbitrary intervals, which makes the calculation of the value guesswork. I'm sooooo stuck :-( that I'd really be glad about another good idea from you...

Sonhospa 3-Sep-20 11:04am View

That's possible... I'll check and hope to resolve that. Thank you again!

Sonhospa 3-Sep-20 10:39am View

Hi again, sorry but I have a follow-up question... using the code now shows that the progressbar isn't working. First the result shows (for the test I display it in a message box) and AFTER this the progress bar increments. Is it at all possible to show the progress in a parallel.foreach loop?

Sonhospa 3-Sep-20 9:53am View

That's perfect - thank you, Richard!

Sonhospa 21-Jan-20 11:43am View

Thank you, Ralf. As written in my first post, I had the same idea but found it a little bit clumsy ("...von hinten durch die Brust ins Auge" ;-) sozusagen). I hoped someone would have a more elegant solution. Have a nice evening!

Sonhospa 18-Jan-20 5:41am View

Thank you, though!

Sonhospa 17-Jan-20 12:45pm View

Hi Dave, sorry for the delayed response. It may seem weird but is still true - only for some SATA drives. If a user accesses the particular HDD, it takes a few seconds to 'wake up' from some kind of standby-mode I suspect. As mentioned, after waking up I get 'IsReady = TRUE'.

Sonhospa 15-Jan-20 10:43am View

For example by opening an Explorer window (Network list -> server name -> drive letter)

Sonhospa 15-Jan-20 9:20am View

Thank you, Dave. However, it must be something drive-specific as on the same machine e.g. 4 drives are reported TRUE (IsReady) while 2 others aren't - at least not before waking them up manually.

Sonhospa 14-Feb-19 14:45pm View

That seems to be exactly what I'm after, thank's a lot! This means I would instantiate the listBox without the "WithEvents" statement, and add the handler later, right?

Sonhospa 13-Feb-19 13:24pm View

Thank you very much, Richard! After studying different sources for the last weekend, I found exactly this method, tried it and - voilá it works!

Since I'm not a professional programmer, it was also critical for me, where exactly in my code I had to place it. You didn't mention that, but I would have understood implicitly to just change my old line. In addition, following another hint, I inserted "readTask.GetAwaiter()" before "readTask.Start()".

Thank you though, and since it's the 'missing piece' I had initially asked for I accepted your suggestion as solution... if you don't mind ;-)

Sonhospa 9-Feb-19 17:57pm View

Sorry for the hospital thing, I honestly hope nothing severe and all turns out well! Just don't let them give you anything in Latin, that wouldn't be helpful if you didn't study it.

FYI: I'm about following a clue of another forums thread where 'Task.Result' is stored in a variable. Peace!

Sonhospa 9-Feb-19 17:28pm View

Good idea, thank you! Second thought: I just don't understand why it would work properly in VS2015 Express then... Still I'll have a look.

Sonhospa 9-Feb-19 17:05pm View

Maybe I didn't express that clear enough. Of course I started VS2010 (which I usually use) as admin, like you suggested. And the result was similar. The OTHER experiment with VS2015 Express was to find out if my code is involved in the problem or not. And it's obviously not.

Sonhospa 9-Feb-19 16:49pm View

Hi again, yes you did and I looked at them - trying to not get even more confused. Please understand that I'm new to this topic! Here's the MS example I mentioned (sorry I don't find how to insert this in a better way: https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task.-ctor?view=netframework-4.7.2). They don't run into the same problem as they output to the console after every task is finished.

Sonhospa 9-Feb-19 16:22pm View

Hello Maciej, thank you for your time. Following your hint I deliberately did that, but it's exactly the same.

Just to find out if it has to do with my (probably twisted) code, I started the project in VS Express 2015 (not as admin), which runs it without any problem several times subsequently.

Sonhospa 9-Feb-19 16:08pm View

Hey man it's the first time I'm trying this and I already admitted that I didn't understand what you mean. If you don't want to help, just don't answer. Have a nicer rest of the weekend.

Sonhospa 9-Feb-19 15:07pm View

I mean how could I achieve to have my "summary" (counts and duration) on the UI thread, i.e. after the threads are all finished? I deleted Wait already, but "you have to get really creative" I didn't expect as advice and possible solution in this forum. Thank you though.

Sonhospa 9-Feb-19 14:41pm View

Yes, that I understand. I mean how could I achieve to have my "summary" (counts and duration) on the UI thread, i.e. after the threads are all finished? From what I read, the Task.WaitAll is exactly for that purpose... or did I misunderstand that?

Sonhospa 9-Feb-19 14:29pm View

Hello Dave, thank you for having a look. I don't understand what you mean. Having the long running tasks on the UI thread would freeze the UI as well, or not? Sorry, it's a bit complicated for my brain...

Sonhospa 4-Feb-19 11:02am View

Good that you write, now I have a 'Reply' button so that I can thank you as well :-) and apologise for not being used to (and also comfortable with) the changed UI.

Thank you as well for the update / non-Linq version! It's obviously a very cool and brief way to reach the same goal without all the syntax hassle that I unsuccessfully tried to master. And in my learning, the different ways pros go are extremely interesting to me!

Would you think the LINQ version is preferrable for speed or sth else, or is it just a matter of taste?

Sonhospa 4-Feb-19 10:31am View

Thank you again, Maciej. I guess I'll try the way with the extra class 'ShortFileInfo', since with the anonymous type I get an error (can't convert to FileInfo).

By the way your additional explanation helped me a lot!

Sonhospa 4-Feb-19 10:25am View

Thank you though, as from the "pupil's" perspective I understand more from your additional explanations. I also appreciate your very good (!) idea to return a specific type.

Sonhospa 4-Feb-19 10:00am View

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!

Sonhospa 4-Feb-19 9:58am View

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

Sonhospa 4-Feb-19 8:37am View

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.

Sonhospa 4-Feb-19 7:29am View

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

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

Sonhospa 4-Feb-19 7:26am View

Deleted

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

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

Sonhospa 4-Feb-19 7:21am View

Deleted

Hi, thank you for taking time.

Maybe you saw in the code that I use Try/Catch with an extra catch of SecurityException and also UnauthorizedAccessException, so I'd guess it's not on that side. I get the error message at the DirectoryNotFoundException, but of course assume that 'GetDirectories' would read a path which 'GetFiles' can use...

I just checked existence of the reported path (or one of them) to make sure, but it is existing but - maybe that's a hint if you're more experienced than I am - it is an EMPTY folder.

EDIT: Another folder reported with the same error is existing as well, but isn't empty. So that clue wasn't right...

Sonhospa 4-Feb-19 7:09am View

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

Sonhospa 4-Feb-19 5:41am View

Thank you, Chill60. I didn't get that right, so your hint relly helps.

Sonhospa 4-Feb-19 5:39am View

Hi Dave, thank you (again) for your answer. Sorry I used the wrong link (not 'reply') to answer so obvously didn't get notified - another member gave that hint to my error.

Sonhospa 1-Feb-19 19:51pm View

Thank you, Dave. I intended to (e.g.) show the currently searched directory in a statusbar. The call to a delegate is commented (green) as when active it resulted in an error (someth. like at breakmark "Code doesn't reach this line and has changed".

I am unsure if it would be wise to give permission to (wichever) changes.

Sonhospa 1-Feb-19 4:25am View

That's much more elegant, Peter - thank you very much!

Sonhospa 31-Jan-19 16:02pm View

Cool, thank you again - I'll give it a read!
And: I've got it to work :-)

Sonhospa 31-Jan-19 14:20pm View

Thank you, Raddevus. I want to understand the delegate/invoke method, that's why I didn't just use the BW. However, I wasn't aware that I'm sending my UI thread to sleep! But there must be more wrong, as the UI isn't updating at all during the loop.

Comments by Sonhospa (Top 54 by date)