Can Immediately Stop A Thread From Running .NET
May 25, 2011
I have the following code running in a thread to enumerate the local machines in the active directory. This takes some time to complete (about 5-10 seconds) so if the user quits the application before the enum is complete the application takes 5-10 seconds to quit. I tried thread.abort but because it is waiting for For Each SubChildEntry In SubParentEntry.Children to complete it doesn't abort until this returns.
Dim childEntry As DirectoryEntry = Nothing
Dim ParentEntry As New DirectoryEntry
ParentEntry.Path = "WinNT:"
[code].....
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Dec 27, 2009
I'm currently making a bot that points and clicks. It works great! The only problem I have is stopping the bot.How could I make a shortcut key that stops the bot while it's running?
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Oct 4, 2010
see below program. I start a new thread x with function abc, then I do some longer task.
Why does x only start after end sub? Shouldn't it start right-away, before sleep ?
[Code]....
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Nov 12, 2010
Can anyone tell me how to kill a thread immediately.
I have tried MyThread.Abort, but it seems to do nothing. Someone told me it's because 'Abort' waits for the current operation to complete, but my thread will run for over 30 minutes before that happens.
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Jan 14, 2011
I have on timer thread that needs to pass every time a different data to another running thread to make the calculations.
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May 30, 2012
FormA calls DialogB where user cancels DialogB which exits via ForceTermination(), see insert.Caller FormA check for DialogResult not = OK, which it isn't, and I can see this in debug as Abort(3).However, the code continues merrily along its way until I get a 'null reference' error which I'm trying to avoid via Force Termination().This is caused by the user cancelling DialogB, a selection process to get a database (SQL) instance.[code]
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Nov 4, 2011
I'm having a hard time stopping a thread. Whenever i close my main form the application doesn't stop because there is a thread still running. I tried every solution I can find in the web but i can't make it work.[code]...
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Aug 12, 2011
I have an application in which there is a do...loop. I need the do...loop to perform some code and then stop for .1 of a second. When i try using System.Threading.Thread.sleep(), a wait cursot comes up and the application stops working. I was wondering if there was any way to get the thread to stop without stopping the application.
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Feb 13, 2012
I have a VB .Net service, which uses System.Threading instead of a timer to basically do what a timer should do. My problem is stopping the service while the thread is in its sleep state. See the code below:
Imports System.Threading
Public Class AService
Private stopping As Boolean[code].....
If say 1 minutes after the service starts, it can not be stopped until its 15 minute interval ticks and the thread wakes. Is there any way to catch the signal that the service is attempting to stop, and interrupt the thread?
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Apr 18, 2009
How can I close or stop a thread. For example
Dim trlisten As Thread
Is it trlisten.Stop? or trlisten.Close? or what?
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Dec 12, 2010
I'm working with vb.net 3.5SP1 /VS2008. I'm familiar with windows threads from C++ but I didn't do it since the 90s.I have 5 threadpool calls (ThreadPool.QueueUserWorkItem) that do some complex work (they read info from different web pages, regular expressions, etc) and each updates different columns in a data-grid view. They pause for 1 second between each web read with thread.sleep (not to overload the server). My issue is that some of the threads do not complete. I get for example 3 results when I should have 8. Sometimes it works fine. This is an older 3.0Ghz HT machine, I want to test it on the lowest common denominator(and that is all I have ). I tried using Monitor.Enter(ListView1)it seems to help but it is hard to tell. I tried using the thread debug window but it is not really helpful, it seems do disappear during execution. If I remove the threads I always get my data. I'm wondering if something is being blocked? Is there a way to debug this?
Also, does thread.sleep(x) stop all threads or just the thread that the statement is executed in?
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Sep 3, 2010
My program starts a lengthy background operation in a separate thread, and the main thread makes the ProgressBar start scrolling. My question is, how do I tell the main thread how to know when the background thread has stopped, so it can turn off the ProgressBar?
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Jul 15, 2009
im calling a sp from vb net code that is rans for about 2 minutes and some times the user wants to cancel the query, how can i get the query id so i can sent the kill sentece?
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Apr 12, 2011
when my pc boots in the task manager processes i have sqlwriter and sqlservr i want then to not start when the computer boots
in : msconfig (of run, cmd, msconfig) i don't know how to stop sql at boot
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May 26, 2009
I used this in VB6 to prevent my program from running twice as it sits the system tray.
If App.PrevInstance = True Then End
What code would i use in VS 2008 to prevent the program from running twice?
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Aug 19, 2009
I have a vb.net application that uses threads to asynchronously process some tasks in a "Scheduled Task" (console application).We are limiting this app to run 10 threads at once, like so:
(pseudo-code)
- create a generic list of 10 threads
- spawn off the threadproc for each one
- do a thread.join statement for each thread to wait for the longest running one to complete.
What i am finding is that if the code called by the threadproc contains any "Debug.Writeline" or "Trace.Traceinformation" statements, the thread hangs. I can see the thread in the Debug - Windows - Threads window, and switch to it, but it highlights the debug.writeline statement and never gets past it. is there something special about the Debug or Trace statements that make them non-thread-safe? Any idea why this would hang things up? If I leave the debug statement in, the thread never completes. If I take the debug statement out, the thread completes in less than 5 seconds.
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May 20, 2010
I have a combo box I am filling on form load.I am using "SelectedindexChanged" to detect changes in the index to run the code when the combobox is used.Unfortunately, it runs the code on start up as well.
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Dec 1, 2008
I have a script that looks for a product number in an excel sheet. If the number is not in the sheet i need the script to stop running and display a message box with the error details. How do I stop the script?
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May 24, 2009
How do I stop a storyboard which is created in blend and programatically running from VB?
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Jun 11, 2010
I would like to prevent all subsequent unit tests from running when certain conditions are met in a unit test. Is this possible in Visual Studio 2005?
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Jul 26, 2011
i've the need to close an ffmpeg conversion started in background with the vb.net process.start.I've seen that an ffmpeg could be closed by hitting the key 'q'.How can i send the 'q' key to the running ffmpeg process?
i intercept the process with this code:
Dim pProcess() As Process = Process.GetProcesses
For Each p As Process In pProcess
If p.ProcessName = "ffmpeg" Then
[code]....
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Jul 3, 2009
Each time my webpage is loaded it runs a routine in the page_load event of the page behind which increments a viewcount by 1.
The problem I have is that the routine runs even if use refresh to reload the page.
How do I stop this routine from running if the page has been viewed by a particular user in their current session? [code]...
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May 25, 2009
How do I stop a storyboard which is created in blend and programatically running from VB?
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Jan 21, 2010
Stop program closing if a special form is running?
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Mar 5, 2009
I want to start a job in a new thread or using backgroundworker to do it but havent done that before and asking you wich way I should do it. My program has a datagridview with a list of files, one file per row. I want the user to be able to select a row and then press "Start download" to start a background job of the download. I want to get events back of the progress of the download.
I have a class clsDownload that handles everything and raises events back but how do I implement the backgroundworking?Should I use the System.ComponentModel.BackgroundWorker inside of the class or create some wrapper that handles this or use some other threading stuff?
Edit: I dont understand how to implement my download in the backgroundworker, any small example would be very nice. The example on msdn didnt get me far.I have a download class that has a StartDownload-function. Should I use the backgroundworker IN the class or in the caller? "feeling stupid"
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Apr 28, 2012
what i currently have is the main form that then when a user presses a button it runs some functions that loops through some files and changes them and then copys them to another location the functions can take quite some time. what i want to is when the button is pressed it opens another form with a textbox on it and when it has finished 1 cycle of the loop is outputs a line to the textbox and tells the user weather or not it has been sucsessfull.
at the moment i have:
Dim t As Threading.Thread
t = New Threading.Thread(AddressOf Form3.Show)
t.Start()
[Code]....
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Dec 3, 2009
I have a webservice with a webmethod that accepts an XML from a client via POST (don't know if this really matters), validates XML and the data inside, and then processes the XML and returns an answer to the client.At moment, I have a problem with large XMLs; it takes too long for the XML preprocessing to finish, and the clients timeout expires.Instead of increasing the timeout of the client I thought I could maybe separate the XML validation from the XML processing by starting a new thread after the validation which processes the XML and at the same time return the validation answer to the client. (the processi
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Dec 7, 2011
I have only managed to use an STA to run a long running excel process with a background worker and 2 delegates.
What I want to do now is have the whole application running outside of the main thread to make sure the UI is always available, I then want to create new threads from the thread I have outside of the main to run the various processes. I will need to have some form of syncronisation in there for certain things to be done once a thread is completed and also I will need to change the button states on the main form to stop certain process being called whilst other processes are running.
This is my code so far, basically this loads in a csv file to a datatable adding manager employee ID and email address, filters it and displays the resultant data in a listview. There eventually will be some filter options as well. There are then 2 options for processing the data, it will produce individual bradford factor reports and email them to each manager or will produce a summary spreadsheet that is sent to HR.
Currently because there are around 8000 lines of data, it was the summary option that required the background worker as a long running process time out error was occuring whilst in the main.
What it does is write the data from the list view to an excel sheet and colour co-ordinates the summary rows according to the absense policy. It then copied bottom to top, the summary value the next blank column against all the lines for that individual and then uses this column to decide which sheet to move the row to, copying the row to the new sheet then deleting it from the master list and shifting the cells up.
This works well, but the process of loading the data in to the list view locks up the main thread where it currently runs. I also wanted to make this slightly more complicate as far as threading is concerned, as more of a learning curve than a practical application of the function.
Here is my code so far: [URL]
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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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Feb 1, 2011
Is there a way in .NET (VB.NET or C#), when an exception happens, to dump the stacktrace of each thread? Basically I would like to reproduce what happens in Visual Studio's Debug->Threads window to see what each thread was doing when the exception happened
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