Cancel Current BackgroundWorker Task Before Running Again?
Aug 1, 2010
I'm using a BackgroundWorker to perform some analysis on a separate thread. The BackgroundWorker is called when a user clicks a CheckBox.
I need to provide for the user clicking the CheckBox, starting the BackgroundWorker task, and then changing their mind and clicking the CheckBox again.I simply want to cancel the currently running task and set the analysis off again. Currently I have the following method:
Public Sub UpdateParkStatusAsync()
Try
'Debug output.
Console.WriteLine("UC_Map_ViewModel.UpdateParkStatus called.")
[code]....
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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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Jun 2, 2011
I have a search box that works great in WinForms, but is giving me trouble in WPF.
It works by starting a search each time a letter is pushed, similar to Google.
[Code]...
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Mar 7, 2011
Is it possible to send information to a BackgroundWorker thread while it is running? Here is my scenario: Parent thread calls background thread to send a data request to a database. If it's a big complicated query it can take a while for the db to respond, so putting the db request on the background worker thread is great. My app can do other stuff while the one thread waits for the db.
Now, db responds with beginning of data. I want my background thread to report back meta data about the result set to the parent thread. No problem there, I can use a custom user state object and the ReportProgress method. But now, how to I send a signal from the parent thread back to the worker thread? I want the background thread to wait while the parent thread does something, and then tells the worker thread to keep going or quit. I know how to cancel a background thread, but I want the parent to be able tell the child some information other than "cancel". Here's one way to think about it:
[Code]....
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Feb 27, 2009
i have a function to export data with some loops now the problem is that when he is exporting the data the program stop responding and only respond when the job is done, and i need a option to cancel the job when it is running but the problem simple block all forms that is opened how can i creat some multi task for fix that problem?
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Feb 27, 2009
i have a function to export data with some loops now the problem is that when he is exporting the data the program stop responding and only respond when the job is done, and i need a option to cancel the job when it is running but the problem simple block all forms that is opened how can i creat some multi task for fix that problem?
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Feb 27, 2009
i have a function to export data with some loops now the problem is that when he is exporting the data the program stop responding and onlyrespond when the job is done, and i need a option to cancel the jobwhen it is running but the problem simple block all forms that is openedhow can i creat some multi task for fix that problem?
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Mar 27, 2012
I have an asynchronous task that is executing a function. The function does not contains any looping statements, but instead it is executing series of sql commands on sql server. Now, i have a button on my window that can cancel these sql operations. In other words, cancel the whole asynchronous task.
I know that this technique will require CancellationTokenSource and CancellationToken to cancel the task, but i've seen many examples on the internet and all of them are showing that the function that task is executing contains loop statements in which they are checking for IsCancellationRequested boolean property. But in my case, it is not so. My function does not have any loop statements in which i can do a check on this boolean property.
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May 31, 2012
I have ...
Private Sub TestTask()
Debug.Write("Running")
For i As Integer = 0 To 60
[code]......
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Nov 15, 2010
what is the difference between a task and a backgroundworker? when it is better to use one and when the other?
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Jul 20, 2011
Is there any direct way to stop a threadpool when user press Cancel Task button? I got SmartThreadPool but using that i could not arrange my code. Its becoming difficult.
Here is my simple code:
'Delegaet to update UI
Public Delegate Sub updateClassDelegate(ByVal index As Integer, ByVal status As String)
[Code].....
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Oct 28, 2011
I'm trying to figure out the best way to approach this. I have a BackgroundWorker which is being used to make a socket connection on a timer.
[Code]...
edit: thinking about it. It would be good if I could somehow build a watchdog into it, so if the BackgroundWorker thread is found to be running for more than 2 seconds, it's terminated as this would indicate the thread has been held up by the tcp connection.
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Jan 26, 2011
I have been pulling my hair out trying to get this to work. If I step through the code in debugger it all works great. My problem is if I just run it, only the last task responds. I'm guessing I am overwriting the background working or something. I am sure I am doing a few things wrong but my code is now messy as I tried many way while searching. I know of the threadpool and .Net 4.0 tasks but having a hard time getting to do what I need.
Basicly I am writing a program (trying more likely) that takes a list of computers and pings then, then checks their uptime and reports back.This works fine in the UI thread (Obviously that locks up my screen). I can have the background worker just do this, but then it does each computer 1 by one, and while the screen is responsive it still takes a long time.
So my answer was to have a for loop for each server launching a new background worker thread. My solution does not work.I have seen other threads that I could do it, but I need to use with events to call code to update to UI when each is done.
What is the most simple way to do this?
Here is my code. Most is just copy paste + modify till I get it working right.
So In the main class I have the testworker.
(I tried using Testworker() but it said I could not do that WithEvents)
When I click the button the list loads.
Private WithEvents TestWorker As System.ComponentModel.BackgroundWorker
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
[Code]...
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Jan 2, 2012
I am using the BackgroundWorker to do the heavy tasks so the UI thread doesn't get blocked. While the BackgroundWorker can send values to the UI thread using the progress-scheme, how can the BackgroundWorker get some values FROM the UI thread?
Either by asking it or simply by the UI thread sending some values to the BackgroundWorker?
Just accessing a variable of the UI thread like UIForm.x within the BackgroundWorker does not work, it does not seem to have access to the UI variables?
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Aug 6, 2009
I have created a application that creates a windows schedule task that connects to a FTP server and uploads/synchronize selected files and folders from your computer. After the user has selected all needed information and click continue, a form with a progressbar (Marquee) should appear. The application will then perform different tasks needed for the schedule to be completed. When all needed tasks are finished i want the progressForm to close and the main form will show you a summary of the newly created task.
I run the tasks in the main thread and assign a backgroundworker for the porgressFrom. i have have also tried to run the taks in a backgroundworker.
Button Continue Click Event.
Private Sub btn_Continue_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Continue.Click
Try
[Code]....
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May 3, 2010
I am having a form1 with only two buttons----
1) Start backup
2) Cancel
If "Start backup" is clicked.... system requires a lot time for backing up many files from source to destination. If I want to free the user before "Start backup" procedure is not completed ...
then what would be the code for "Cancel" button...? Only I want to stop the running procedure of "Start backup" quickly.
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Nov 5, 2008
I have a VB application and I want to allow the user to choose an option between "OK" and "Cancel" buttons when he want to exit the VB application. So far, I cannot figure how to allow the user to click "Cancel" to allow the VB application to continue running. [code] So how do I allow user to click "cancel" button to prevent from exiting?
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Apr 10, 2009
Back when i used vb i used an unload form command which allowed me to completely close it. but now i cant use it in 2008 [code]...
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Jan 30, 2012
I am developing a solution in .Net utilising the VMWare Web Service API to create new isolated virtualised development environments. The front end will be web based. Requestors input details for the specific environment which will be persisted to SQL. So I need to write an engine of some sort to pull the data from SQL and work on the long running task of creating resource pools, switch port groups and cloning existing VM templates etc. As work progresses, events will be raised to write logs and update info back to SQL. This allows requestors to pull data back into a webpage to see how it's progressing or if it's completed.
The thing I am struggling with is how to engineer the engine which will exec the long running task of creating the environment. I cannot write a windows service (which I would like) as we work in a very secure environment and it's not possible (group policy etc). I could write a web service to execute the tasks, extending the httpRuntime executionTimeout to allow the task to complete. But I'm keen to hear what you guys think may be a better solution to use (based on .Net 3.5). The solution needs to be service oriented as we may be using it on other projects within our org. What about WWF, WCF? I have not used any of the newer technologies available since .Net 2.0 as we've only just been approved to move up from .Net 2.0.
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Jul 27, 2009
I am currently attempting to support a ClickOnce application that i did not write. This application is running from a scheduled task. The scheduled task points to a .application file. This had been running happily untill today when it stopped. The only thing that has changed is that the application has been executed manually by a developer by double clicking on the .application file. Since then each time the scheduled task is scheduled to run the application doesn't appear to execute. The task reports no error and the error code (0x0) given indicates it ran and completed ok.
I am not familiar with ClickOnce and am not sure when implication clicking the .application file would have had or why it has stopped running as a scheduled task. It appears to me that everything else has remained the same (i have checked it is running under the correct account etc).
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Apr 22, 2009
How would I Make a program that would detect running process in the taskmanger:
Info on my program
+Like I want it to load the process name's in a Rich textbox or label or textbox (if that's possible XD).
+ And I will Have a Button that once I see all the process and then the button1 will kill the processes I Pick.
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Nov 6, 2010
How would i know when a thread is completed running it's task? I mean in background worker it has a completed event, but can i make something similar to that?
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Jan 15, 2010
When i close my program its still running in the task manager, how do i close it completly ?
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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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Jun 7, 2011
how do i get the full path of running process in task manager.
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Jun 5, 2012
I am using Parallel.ForEach to do some time consuming operation. Coming to the question ,
For example,
I am enumerating a collection called 'TestCollection' which has 3 items.
Parallel.ForEach(TestCollection, po, AddressOf DoSomeThing) So 3 tasks will be running in paralell at a time Now I want to add another 2 items to TestCollection, while the task is running.
How to enque the additional 2 items to the 'TestCollection' so that additional two tasks will also run in paralell. Finally 5 tasks should run in paralell without stopping the running task. If a post answers your question,
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Feb 25, 2010
I need to have a windows service that capable of monitoring constantly whether my application is running or not. If not, the windows service will RUN it for me.
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Jan 13, 2012
I cannot get Excel 2010 to close by using VB on my Windows XP computer at work. I have what I thought would be able to close it, but it doesn't. I do not get any errors, it its just that after multiple times of the code running, I have multiple instances of EXCEL.EXE running in the task manager, which causes problems. I am going to post the code below:
Option Strict Off
Imports Excel = Microsoft.Office.Interop.Excel
Public Class CompareDataExcel\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
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Jul 22, 2011
I know this code will give a list of processes
ListBox1.Items.Clear()
Dim ProcessList As System.Diagnostics.Process()
[code].....
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Dec 31, 2009
I'am trying to write a program in order to obtain a screen picture for a post review of the running window that should be periodically executed with the tasks manager.
[Code]...
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