VS 2010 : BackgroundWorker Does Not Report Progress
Sep 5, 2010
I have some issues with background worker progress reporting functionality. I'm implementing a progress indicator and even if I marked the backgroundworker as report progress (true), it won't report progress until it finish the job.
The code is like this:
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
action_1()
[code]....
The result is as expected (label1 with 100 value) but only when worker finished all the steps. If I'm triggering a messagebox in ProgressChange I see two message windows at the end of DoWork handle.
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Jan 6, 2010
I am using backgroundworker thread in my app. I also have a class in my project and am able to updated the user UI from the form, but most of my time consuming operation happens in the class so I tried to do an update like this Form1.BackgroundWorker1.ReportProgress(4, strname), but I get an error that say that the backgroundworker is not set to report progress.
I have this set in the load event for the app.Are you not able to call form items like this from a class?
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Apr 27, 2010
i have a standard login form that allows the user to enter username and password and click OK or cancel. I have a progress bar called pbLaunch with the visible property set to false and the animation set to marquee. when the user clicks OK i would like to run a separate thread called bgwProgress that makes the progress bar visible and fires up the marquee just to show that something is happening while form1 loads up.....so far i'm stuckn the ok click event i have the following:
Try
Dim bgwProgress As New System.ComponentModel.BackgroundWorker
bgwProgress.WorkerSupportsCancellation = True
[code].....
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Nov 15, 2011
I have a VB.NET 2010 app that uses a backgroundworker to process MS Word docs. All of the code does what it is supposed to do, except when my code calls ReportProgress(). The UI cannot process the ProgressChanged event fast enough before the values in the class that are passed are changed. I know this because I inserted a System.Threading.Thread.Sleep(100) line after each ReportProgress() call which allows time for the UI to make the updates properly. I guess I am looking for a better solution thanThread.Sleep(100) since this adds to the amount of time it takes to process all of the files. Here are some snippets of code that I am using:
[Code]...
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Feb 14, 2012
I am trying to implement a BGW and want to report progress to a progress bar for my TextFieldParser program, sometimes if your opening very large files it takes a while and I would like the user to be able to see the progress and have some interaction so they know the program is still running I am a little hung up on what to in the reportprogress
I have:
worker.ReportProgress(0, myReader.ReadFields())
and its not doing anything, I didnt expect it too since ReadFields is an array
parser
Private Sub BackgroundWorker1_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
Dim worker As System.ComponentModel.BackgroundWorker = DirectCast(sender, System.ComponentModel.BackgroundWorker)
[code]....
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May 22, 2012
trying to show 'loading' text while performing selectedindexchanged with backgroundworker
but it is hang in 'loading' and result does not show :(
Private Sub cbPortNo_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbPortNo.SelectedIndexChanged
[Code]...
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May 23, 2011
I have created a simple Backgroundworker process to copy a large file (30GB). Is there any way to report the progress of that file copy?
I'm using System.IO.File.Copy to perform the copy. I've seen a few posts/blogs that suggest comparing the bytes copied with the size of the source file but that seems like a huge overhead in this case.
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Feb 3, 2009
Got a bit of a weird problem with a progress bar. I'm using a backgroundworker, which calls a "Process" function in a different class. The function goes about its business, and sends an update back to the form displaying the progress bar. What I'm finding is that its doing everything right, except update the progress and a label on the form. I've put breakpoints in to check the values of variables being sent to the form, and they're correct. I've also checked the value/maximum of the progress bar during the same break as I step through, and they're being set correctly.
they're just not displaying their updated status. I've tried refresh and application.doevents, to no avail. When the backgroundworker is complete, the values of the progress bar/label are as if I've never touched them! When the worker is complete, the Close button is enabled, so I know its finished. Anybody got any pointers/thoughts on this because I've been battling with this for a day and a half so far. I'm using the same technique as I've used elsewhere in the app to do similar backgroundworker progress updates, but this one refuses to work properly.
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Dec 10, 2011
I am currently trying to develop an application which will backup large folders to a specified destination. To find all the files in the specified 'backup' directory I am using the following code.
[Code]...
I have tried putting my GetFilesRecursive function into a separate background worker to run first so I can update the GUI however I am struggling on how to return the List of found files back to my application (I get cross-threading exception) and how to update the progress bar to show the progress of the GetFileRecursive function so the user knows it is processing the list of files and has not crashed/frozen.
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Aug 4, 2009
I have a Worker.cs in a ZScreenLib DLL that does the following: 1. takes ZScreenGUI.cs (a Windows Form) as an argument 2. creates a Background Worker object and does everything 3. reports progress to the ZScreenGUI form via BackgroundWorker.ReportProgressThe user can create as many instances as possible of Worker.cs class and do the background worker tasks Now I need to create another Windows form called ZScreenCLI.cs and wish to make use of this Worker.cs class because ZScreenCLI and ZScreenGUI are pretty much the same but ZScreenCLI has much less features compared to ZScreenGUI. My question is, how do you manage to report progress to ZScreenCLI? The ReportProgress methods are tied with the controls in ZScreenGUI form. Obviously there is a problem with the concept I am using
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Apr 13, 2011
I just got into VB 2010 with SQL 2008 Server Report. I was able to create a report as my wish and it's vieable via direct url (URL). But I want to pass login Information and Selection parameters to the report. But I don't want to pass them thru URL, So I want to load them from the application (winform) and launch the report in iexplorer.
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Mar 9, 2012
i have problem with the reportprogress / progress changed.i use the backgroundworker in a form class named frame menu. the do work sub of the backgroundworker calls a sub X in a public module.
from the backgroundworker do work sub i am able to use the backgroundworker.reportprogress / backgroundworker progress change method and this is displayed on my form.
when i am using the backgroundworker.reportprogress / backgroundworker progress change method from the sub X it does not display on my form.
when i debug the code it calls the backgroundworker.reportprogress / backgroundworker progress change method correctly in the sub X but just does not display it on the form.
[Code]...
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Mar 31, 2009
I need to report progress changed. Consider the following code:
Public Class Calculator
Public Event CalculationProgress (ByVal sender As Object, ByVal e As MyCalculationProgressEventArgs)
Public Function Calculate(..)..
' Perform calculation here ...
[code]....
How and where should I subscribe to CalculationProgress event to call
calculationWorker.ReportProgress(MyCalculationProgressEventArgs.Percent)
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Jun 23, 2009
I have a program that downloads information from another class, specifically it collects domain names.So i have a class called domainscraper....on my main form I have a background worker and progressbar, and i put this in the dowork event:DomainCollector.GetDomainsByMethod(parameter)Now my question is, how could I report progress to my progress bar on form1.vb from that method I use in the the domainscraper class (domainscraper.vb).
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Jan 17, 2012
Looked through many tuts, can't find one.
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Mar 6, 2012
I am writing some data to my Database using TableAdpater.Update and the operation can take up to one minute to complete.
Is there some way to report the progress of this to the user because they think it has stopped responding.
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Oct 5, 2010
Is there currently any possible way to report progress of my unit test? I have a test that could take up to a hour, and I don't want to sit there not knowing what % it is done with. I have tried writing with debug.print and trace.writeline, neither of which seem to work.
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Jun 9, 2010
I was wondering if there was a way to call defrag.exe from my vb.net program but also be able to watch the progress?I am not reinventing the wheel I am simply making a small app for my customers computers (for free) that will automatically perform disk cleanup and defrag to a schedule not requiring the end user to do absolutly anything (+some other tasks and features)
I have my disk cleanup all working but for the Defrag I would just like to use the windows defrag for instance (defrag C however I have a small GUI with progressbar and % indicator is there anyway I can get progress to report back. I know Windows defrag is compeltly different in Windows 7 I am not sure if this is even possible?
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Jun 3, 2010
how can i attach a progress bar to a crystal report progress control, my code extracts the data from the SQL Server database and displays it on a crystal report. all this process may take long time as the data size may be large or joins may take time, so how can i display this progress in a progress bar. How to attach hidden processes to the progressbar.
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Jun 22, 2010
I wish to add a progress bar in code. I have a sample here but with the "Cursor.Current = Cursors.WaitCursor" to notify the user that it running.. however a progress bar maybe can make it more noticeble. how can i do that.
Private
Sub CmdOK_Click(ByVal
sender As System.Object,
[code]....
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May 23, 2012
I am using background worker to report progress on the screen. In the Main.vb I have the following
Public Sub report(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bwlistener.ProgressChanged
Dim message As String = e.UserState
logRTB.AppendText(message & vbCrLf)
End Sub
When I call this from Main.vb I use:
bwlistener.ReportProgress(0, "Some status text goes here")
It works great. The problem is when I try to call it from any other module in my project.
When I call it OtherFile.vb:
Main.bwlistener.ReportProgress(0, "Some status text goes here")
It doesn't work... The program doesn't crash. Debug goes through everything but no output is actually shown to the end user.
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Dec 14, 2009
in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
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Jan 7, 2011
Here's my code :
VB
'Clearing the selected items of the listview
ListView1.SelectedItems.Clear()
'Random selection of farms from the listview
Dim random As New Random()
Dim rand As Integer = random.[Next](0, ListView1.Items.Count)
[Code] .....
I'm running it under a BGW and it works fine but is there anyone who can comment on it and make my code a bit better. I've a background worker and I am running it again and again on the RunWorkerCompleted like this
VB
Private Sub BGW_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BGW.RunWorkerComplete
BGW.RunWorkerAsync()
End Sub
Is it bad coding or is there any alternative to run it?
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Feb 16, 2010
I'd like to have a backgroundworker process data that will eventually populate a gridview in my windows form. I need to use a backgroundworker because the process takes a little while, normally causing the program to slow/freeze until it's opening and streaming connections.. So, I'm using a background worker to perform these methods.How can I take the data from the background worker (on a separate thread than the UI) and use it to populate controls in the UI?
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Sep 24, 2009
I have the download progress bar working in my program but I can't find any working code to determine the amount uploaded. here is my upload code
[code]...
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Feb 16, 2010
I cannot figure this one out.. I have a background worker that will perform a task streaming data from some webpages. this data is then passed back and displayed in a gridview. It has been working fine.
I've recently implemented a listbox, which its values will be passed into the function that the background worker will perform as parameters, originally i had taken a single value from a textbox.
Now, I thought maybe it had something to do with the listbox, so I used a static value, just a simple String, as the parameter, and again, I get the TargetInvocationException was unhandled.. There's no difference in how I perform the task I'm trying to have the backgroundworker complete, the only difference is where it exists in my if condition statement:
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles ScrapeSites.DoWork
Dim results As ArrayList
Dim worker As System.ComponentModel.BackgroundWorker = DirectCast(sender, System.ComponentModel.BackgroundWorker)
[Code]...
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Mar 3, 2011
I just want to to change a label name from the backgroundworker, the code is plain simple:
label1.text = WebBrowser1.DocumentTitle and the error returned would be "Specified cast is not valid".
Now running the code from a button would do the job, but from the bgworker not, and I can't seem to get around it.
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Oct 14, 2009
I have a class that downloads a specific file from the net.This class uses a BackgroundWorker. I tried to implement kleinma's Download Files From Web With Progressbar [URL]../showthread.php?t=396260), but I'm having difficulties making it work. I'm including a test project, so if someone is willing to take a look at it, it would be great .
The part I'm having trouble with is updating the progressbar and progress label. The errormessage I receive is in Norwegian, but it has something to do with threads. I suppose I should use Invoke or something, but I don't know where to start..
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Apr 18, 2012
I'm struggling with a thing or two...and i've read some stuff about the backgroundworker but im stuck Basically what i have is a : PUBLIC FUNCTION TEST (path as string) : which at the end of work , adds an item to the form1.listbox. That works quite nice but freezes the app. I've tried using the backgroundworker, the function in the background worker seems to work nicely, the bad thing is that i dont get any results in the form1.listbox.
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Jan 19, 2012
I've wrote this code to accomplish what the image below looks like. This works fine for anything that is around 40x40 but if I try to do 100x100 it takes forever and sometimes errors out with a window handle error. Once it gets around the 40th column the labels start adding slower and slower. Is there anything I can do to make this more efficient? I added the backgroundworker routine in there to see if it would speed things up at all but it doesn't.
vb.net
Private Sub CreateGrid(ByVal rows As Integer, ByVal ranges As Integer)
If Me.InvokeRequired Then
[code]....
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