[2008] Backgroundworker Progress Bar - Not Displaying Updated Status
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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Apr 12, 2009
i need help with progress bar and status bar on my tabed webbrowser. i can only get it to work if i add the same lines of code to every tab and webbrowser i wont to use. =/ my code to longe to me paste on here.
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Jan 10, 2010
Transfer
Public Sub DownloadFileBinary(ByVal localFile As String, ByVal downloadUrl As String)
Dim req As HttpWebRequest = DirectCast(WebRequest.Create(downloadUrl), HttpWebRequest)
req.Method = "GET"
Dim resp As HttpWebResponse = DirectCast(req.GetResponse(), HttpWebResponse)
' Retrieve response stream
[Code] .....
1. How can I create a progress bar that will indicate the status of the transfer?
2. If the remote path is not available, how can i easily alert the user that it is unavailable. Currently it returns an exception but it took a lot of time to return this message..
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Jun 29, 2011
I am writing an application that calls data collectors (via ip or modem), collects data from them and reformats it. I had this much written when I was asked to make it multi-threaded so that I can collect from multiple sites at one time. I have that written using backgroundworkers and it appears to be working well. On my UI I have a text box that needs to update with status details like, dialing, collecting, reformatting, etc. I planned to simply write the status updates to the text box from an UpdateStatus routine. Found that had all sorts of nasty threading issues, so I added a delegate to call the status update routine. Problems seem to be fixed except that the updates to the UI are coming in chunks instead of one by one as they really occur. Can anybody tell me how to force the status update in the text box to update more asynchronously?
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Sep 16, 2009
i am asking about using the progress bar into the status bar to move when i load any child form inside the MDIParent form . have a code 4 it
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Jun 11, 2011
i would like to ask some question regarding status strip control.i am currently doing my school project that need status strip progress bar, which indicating the loading of the image in the picture box. however i have no idea how to make this two corespond to each other.
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Apr 29, 2009
i need help with progress bar and status bar on my tabed webbrowser. i can only get it to work if i add the same lines of code to every tab and webbrowser i wont to use. =/ here is my code
[Code]...
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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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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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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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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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Oct 25, 2010
I have a program that connects to an ODBC tables (3 of them) and I use select .... Left join etc Where ... etc. The issue I have is the connection takes about 20 to 25 seconds to complete. I'd like to create some status message so the user knows the system is not actually hung. Using Visual Studio 2010 Ultimate, VB.NET, ADO 2.7.
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Aug 6, 2009
i wanted to update my status to indicate e order is delivered or progress in my database and the form itself. so i decided to use progressbar. but im not sure how the coding going to works. or is there other alternatives suggestions on how im going to update my status?
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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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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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Aug 11, 2009
Here's my
[Code]...
During the file copy, Label2 isn't being updated. In fact, my whole form goes non-responsive. How can I fix this?
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Sep 14, 2010
I'm using Windows XP and VB.net 2005. I've search for information on how to use the BackgroundWorker to display a ProgressBar during a process and thought I had it correct, but appearently I don't - the bar never shows, much less moves. My goal is to have a Marquee Style progress bar display while my code is looping thru a query result populating a datatable that a DataGridView is binded. Here is my code.
[Code]...
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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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Jan 25, 2011
I am using the following code located here to upload files
Public Function UploadFile(ByVal oFile As FileInfo) As Boolean
Dim ftpRequest As FtpWebRequest
Dim ftpResponse As FtpWebResponse
[Code]....
I would like to extend it, so i can have an upload progress too. The problem is that i do not know from where to start. What is the "logic" of displaying the upload progress?
"Split the file" in predefined parts and upload them or what?
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Dec 2, 2009
I have a WinForms app and am trying to add the ability to start up multiple operations based on data entered in a datagridview. The operations must be run synchronously to monitor that they complete succesfully before inserting a row into the DB to indicate that the operation was succesfull. I also have a status event handler on the operation which will return the percentage of the running operation.
So far I am using threads to kick off the operations, however it is updating the progress of just one of the threads. When that thread is complete it is moving on the the next and will work that until completion. I would like them both or more to run simultaneously and be able to report the status of each.
I am basically looping through the rows in the grid and using the values there to instantiate a new class I created. I am then creating a thread and kicking off a sub to perform the operation from the new object. I think I may be close as I know they are all being started, but they are just running one after the other rather than all at once.
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Feb 16, 2010
I've asked this before, or something similar, but can't find it so I don't know what the answer, if any, was.
[Code]...
Now it seems to work fine, but I'm working with very large files (70+ GB) across a network (local copy is not an option) and while the function is executing if the user moves the application the screen can go blank and they can panic. What I want is a way to update something like a progress bar to give feedback to the user.
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Sep 16, 2009
i am asking about using the progress bar into the status bar to move when i load any child form inside the MDIParent form.
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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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Jan 4, 2012
frmMain - Allows user to pick process or combination of processes they want to run frmProcess - Shows progress of their selection I have three modules. Each runs a specific process. The frmMain allows the user to run any one of the three modules individually or all together in a single process (basically, runs the one after the other until done).
[Code]...
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Jul 1, 2009
part of my code is in below
[Code]...
I would expect to see the path.Path include the new record, however, I also notice that tempnextgen also include the new record. Can anyone help me out on this issue? Why the tempnextgen got updated as well, how to prevent this unexpected operation?
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Sep 1, 2009
Here is my insert statement:
[Code]...
Now for a succesful insertion i want to notify the user about a successful save operation.....i.e,i want to display a message "Successful Save Operation"to the user. How to do this using the Status Strip?
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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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Apr 2, 2010
I have a progress bar on a Windows Form which displays the number of records as they are retrieved from the database.The problem I'm having is that the entire Form.Load() method seems to run prior to the form being displayed, which means all my code updating the progress bar is gone to waste.
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Aug 21, 2011
SOrry for long title i've forgotten how to do this so please may i have a code im new to VB 2008
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Mar 20, 2009
I've got the code to display the current browser status text in the status bar but i want it to display the name of my web browser aswell. Example: Dreamincode.net - (Name of Webbrowser)
He is my code for the displaying staus text.
Private Sub webBrowser1_StatusTextChanged( _
ByVal sender As Object, ByVal e As EventArgs) _
Handles webBrowser1.StatusTextChanged
[Code]...
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